Updated October 2, 2026
⚡ Quick Summary
The short version: cold weather is not the reason to worry about an EV. Getting stuck is, and that is the same problem in every car. An EV loses range in the cold, and I cover that honestly in the winter range article. What it does not do is leave you choosing between a cold cabin and a running engine while snow packs the exhaust pipe. That changes what you carry, but it does not shrink the list.
- Warmth first. A real blanket and a mylar bivy sack, because the car’s heat is a backup, not the plan. The CDC says it plainly: don’t rely on a car to provide enough heat.
- Phone power that survives the cold. A jump starter with a power bank does two jobs. Charge it in the house, not the trunk. The one I picked will not accept a charge below 14°F.
- Be seen. LED flares that stick to the car, and a bright cloth for the door. A lit car is easier to find than a dark one.
- Get unstuck. A folding shovel and a pair of traction boards. Many winter strandings are a snowbank, not a breakdown.
- Water and food that don’t freeze solid. Nothing to buy here. Rotate them.
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The cold-weather question, settled first
EV owners hear the same thing every time the temperature drops, usually with a worried face: “aren’t you scared of getting stranded in that thing when it’s freezing?” That question is worth settling first, because the answer decides what you carry. The short answer is no, and the longer answer is that being stranded in winter is dangerous in any car, and the EV is the better place to be stuck. What actually protects you is the same in every vehicle: warmth, water, a charged phone, and a way to be seen. That’s the winter emergency kit, and it’s the second half of this article.
I’ll be straight about range, because it’s where the worry starts. In winter I get roughly 10 to 15 percent fewer miles out of a charge, and on my regular two-and-a-half-hour trip I arrive with about 10 percent less in the battery than I do in summer. The federal numbers are harsher than mine. Fueleconomy.gov puts an EV’s range loss at about 41 percent at 20°F, against roughly 15 percent for a gasoline car in city driving, and it says about two-thirds of the extra energy goes to heating the cabin. My own numbers and why they’re smaller than the government’s are in the winter range loss article. The way I handle it is simple. I normally charge to 80 percent every night, and in a really cold stretch I charge to 90 before the long trip so I still arrive with plenty. Plan for less range, and the range question goes away.
What doesn’t go away, in any car, is the chance of sliding off a road or sitting in a closed highway for hours. That’s the scenario the kit is for. The rest of this piece is that kit, built the way I’d build it as a nurse: the medical risk when you’re stuck in the cold is hypothermia, and everything on the list either keeps your body heat in, gets you found faster, or gets you moving again.
What an EV does differently when you’re stuck
Here is the National Weather Service’s advice if your car gets stuck in a storm, quoted from its winter safety page: “Run the motor about 10 minutes each hour for heat. While running the motor, open the window a little for fresh air to avoid carbon monoxide poisoning. Clear snow from the exhaust pipe to avoid gas poisoning.” The CDC’s page says the same thing in almost the same words. That is the standard advice for a gas car, and it is good advice, but read what it’s asking of you. Ten minutes of heat an hour, a cracked window while it runs, and a trip outside into the storm to dig out a tailpipe, because a blocked exhaust can put carbon monoxide in the cabin.
An EV has no exhaust pipe and makes no carbon monoxide. You can leave the heat on. Tesla’s manual describes exactly this: in Park, “Keep Climate On” and “Camp Mode” keep the climate system running “even after you’ve left” the car “or choose to stay inside the vehicle,” and Camp Mode also powers the USB ports and the 12-volt outlet. The manual’s own warning applies here and I’ll repeat it: “Avoid using Keep Climate On, Pet Mode, or Camp Mode when the Battery’s charge level is low.” The car will also tell you if the climate shuts off for any reason, through the app. So the stranded-in-a-storm picture in an EV is a warm, sealed cabin drawing on the main battery, not a ten-minutes-an-hour ration with a window open.
Two honest limits. First, I can’t tell you how many hours a given Tesla will hold a warm cabin at a given temperature, because Tesla doesn’t publish that number and I’m not going to invent one; it depends on how cold it is, how much charge you have, and what you set the temperature to. Plan as if the heat is a bonus. Second, the EV’s other advantage is one Tesla states and I can’t measure: its winter driving page credits “equal weight distribution, highly responsive motor control and dynamic traction control.” That’s the traction system doing its job, and it doesn’t replace tires. I run all-seasons year-round on all three of our cars, and I say so in the tire care article along with what the manual says about winter tires.
One thing that is the same in both kinds of car: the 12-volt battery. A Tesla still has one, and it’s the battery most likely to strand you, in summer or winter. If it dies, the car doesn’t wake up, and no amount of charge in the big battery helps you until the little one is jumped. That’s why a jump starter is on this list even for an EV. The 12-volt battery article covers which battery you have and the warning signs.
The winter kit, in the order I’d buy it
The list below follows the CDC and NWS guidance for a stranded vehicle, and I’ve put the reason next to each item so you can judge it yourself. The CDC’s line that governs the whole thing: “Always carry extra warm clothing and blankets with you. Don’t rely on a car to provide enough heat. The car could break down.” If you already have the year-round roadside pieces from the EV emergency kit article, this is the winter layer that goes on top. Snow brushes, windshield covers and the rest of the outside-the-car gear are in the winter accessories roundup, and I don’t repeat them here.
1. Warmth: a bivy sack and a real blanket
Hypothermia is the medical risk in a stranded car, and it does not need arctic cold to do it; it needs time, wet clothes, and no insulation. The CDC’s warning signs are worth memorizing, because the person who has them usually doesn’t notice: shivering, exhaustion, confusion, fumbling hands, memory loss, slurred speech, drowsiness. A body temperature below 95°F is an emergency. The practical point for a car kit is that you need two kinds of warmth. Something that stops heat leaving your body, which is what a mylar bivy does, and something with real loft that stays warm when you sit still for hours, which is a blanket. The thin foil “space blanket” in most roadside kits is neither; it tears, it slides off, and you can’t get inside it.
Sierra Madre Emergency Sleeping Bag, Thermal Bivy Sack, 2-Pack
Why it’s here: it’s a bag, not a sheet. You climb in and cinch it, so it holds warm air around you instead of blowing off the first time you shift. The listing says it “reflects 90% of body heat,” is made of “durable PET” rather than the tissue-thin mylar in a gas-station blanket, weighs “just 6 ounces,” and folds back into its own stuff sack so it’s “tough enough for multiple uses.” Two in the pack means one per front seat, or one to hand to someone in the car behind you.
Per the listing: waterproof and windproof, larger cut “fitting more body types,” drawstring stuff sack included. Store it in the cabin, in a door pocket or the console, not the trunk. If you need it, you don’t want to go outside to get it.
Fits: any vehicle; this is a body-sized item, not a car part.
EverOne 80% Wool Fire Retardant Blanket, 66″ x 90″
Why it’s here: wool is the CDC’s own recommendation for the insulating layer (“Natural fibers, like wool, goose down, or a fleece work best”), and unlike a fleece throw, wool is known for insulating even when it’s damp, which matters if you’ve been outside digging. This one is a military-style blanket, “80% wool,” “fire retardant,” and at 66 by 90 inches it is “over seven feet long,” big enough to wrap two people or to fold double over one. It’s heavy and it’s not soft. That’s the trade for a blanket that works when the pretty one doesn’t.
Per the listing: 80 percent wool, fire retardant, olive drab, 66 by 90 inches. Keep it folded flat under a seat or in the trunk well; it doesn’t need to be in the cabin the way the bivy does, because you’ll go get it once, not in a hurry.
Fits: any vehicle.
Add a coat. I mean an actual winter coat that lives in the car from November to March, plus a hat and mittens, because the CDC’s list starts with a hat and it prefers mittens to gloves (“they are warmer than gloves”). Most of us drive to work in a light jacket because the cabin is warm and the walk is short. That’s the outfit you’ll be wearing when you’re stuck. There’s no product link for a coat; use the one in the back of your closet.
2. Hand warmers that don’t need a battery
I went back and forth on rechargeable hand warmers for this list, and I decided against them for one reason: a kit sits in a cold car for four months, and a lithium battery that sat in a cold car for four months is not the thing I want to depend on. Disposable air-activated warmers have no battery. They sit in the glovebox for years, you tear the packet, and they get warm. They’re also the cheapest item in this article, so buying a fresh pack each fall costs about what a coffee does.
HotHands Hand Warmers Value Pack, 10 Pairs
Why it’s here: no battery, no charging, no cold-weather cutoff. The listing says “up to 10 hours of consistent natural heat,” “air-activated,” and puts the ingredients on the box: “iron, water, vermiculite, charcoal, polymer, and salt,” which is why they can’t go flat in storage the way a rechargeable can. Ten pairs is enough to put two in the glovebox, two in the console, and hand the rest to the passengers. Tuck one inside each mitten and one against your chest under the bivy; that’s where they do the most good for the CDC’s “keep your core warm” advice.
Per the listing: average temperature 135°F, up to 10 hours, made in the USA with domestic and imported materials. Don’t put them directly on bare skin for long stretches, especially if you have reduced feeling in your hands or feet.
Fits: any vehicle, any pocket.
3. Phone power, and a jump for the 12-volt battery
The NWS says don’t leave the house in a storm without “a fully charged mobile phone, car charger and an emergency supplies kit.” A cold phone loses charge faster than you expect, and it is your only link to a tow truck or a 911 dispatcher. In a Tesla the USB ports charge your phone while the car is awake, and Camp Mode keeps those ports live while you sit. But a kit has to cover the case where the car is the problem, and in a Tesla that usually means the 12-volt battery, which is why the power bank worth carrying is also a jump starter.
GOOLOO A5 Jump Starter with Air Compressor, 4000A, 20,000mAh
Why it’s here: it’s three winter jobs in one box: a 20,000mAh power bank for phones, a 12-volt jump starter for the battery that actually strands Teslas, and a tire inflator for the pressure drop that comes with every cold snap (Tesla’s manual says tires lose about one PSI for every 10°F drop). The listing states the cold limits plainly, and they’re the reason it’s on this list and not a cheaper one: “operating/storage temperature: -4°F to 140°F; charging temperature: 14°F to 113°F.” Read that second number twice. It will jump your car at zero degrees, but it will not take a charge below 14°F. So it lives in the cabin, and it comes inside to charge.
Per the listing: 4000A peak, 20,000mAh rated capacity, up to 160 PSI inflation, LED light, 45 W USB-C output cable built in, and a maintenance line worth obeying: “recharge it at least once every 3 months during long-term storage.” Put a reminder on your phone for the first of December, January, February and March. I already recommend this unit in the EV emergency kit roundup for the same reason.
Fits: any 12-volt vehicle; the listing rates it “up to all gas / 10.0L diesel.” For a Tesla, jump only the low-voltage battery, following the manual’s jump-start procedure for your model.
Keep the jump starter in the cabin, not the trunk. That is a standing rule on this site for any battery you might need in the cold, and the GOOLOO’s own charging floor is the reason. A 12-volt car charger for your phone belongs in the console too; the NWS lists it separately from the phone for a reason.
4. Being seen: LED flares and a bright cloth
Both the NWS and the CDC tell a stranded driver to “tie a brightly colored cloth to the antenna” and to raise the hood once the snow stops. A Tesla has no antenna mast, so use a door handle or a mirror, and open the hood (the frunk) once the snow stops. The other half of being seen is light. A dark car on a shoulder at night is hard to see, and cars that are hard to see get hit. Ready.gov’s car kit list includes “flares or reflective triangle.” A reflective triangle is good; a flashing LED disc stuck to the roof is better, because it works whether or not the car has power.
Tobfit LED Road Flares, 6-Pack, Magnetic Base
Why it’s here: six discs with a “solid Neodymium” magnet base, so two go on the roof, two on the trunk lid, and two go out behind the car on the road. The listing claims they “can be seen up to 1 mile at night,” have “9 flashing modes” including SOS, are “IP67 rated” against water, and can “bear a 30 ton vehicle” if one gets run over. No flame, no smoke, nothing to burn out in a minute the way a highway flare does. They come with a storage bag.
Per the listing: batteries are NOT included; the maker recommends AAA cells. Buy lithium AAAs, not alkaline, because lithium cells generally hold their charge better in the cold and are less prone to leaking in a glovebox. Test them when you set the clocks back in the fall.
Fits: any vehicle with a steel roof or trunk lid for the magnets. If your car has a glass roof, a magnet won’t hold there; use the hood, the trunk lid, or the road.
5. The all-in-one roadside kit as the base layer
Most people are better off buying one boxed roadside kit and then adding the winter pieces above than trying to assemble thirty small items from scratch. A boxed kit gives you the reflective triangle, the jumper cables, the tow rope, a rain poncho, a basic tool set, a little flashlight, and usually a small first-aid kit, all in one bag you can drop in the trunk well and forget. The one below has been my base-layer pick on this site since the roadside article, and it’s the one the calendar named for this piece. Two honest notes on it: the “life blankets” inside appear to be the thin foil kind, which is why the bivy and wool blanket above are still on the list, and the jumper cables are for a normal car’s battery. In a Tesla the jump starter above is the tool, and the cables are for helping the gas car next to you.
HAIPHAIK 142-Piece Emergency Roadside Kit with Jumper Cables
Why it’s here: it’s the bag everything else stacks on. Per the listing it contains a “snow shovel, flashing lights, reflective triangle warning signs,” 8.2-foot “UL certified jumper cables,” a “towing rope,” a “safety hammer and seat belt cutters,” “life blankets, raincoats,” and a small tool set with pliers, screwdrivers, a utility knife and tape. The listing’s own words are that it “can fit anywhere in your backseat, trunk or even in your spare tire compartment,” and a Tesla’s under-floor trunk well is exactly that space.
Per the listing: 142 pieces, UL-certified cables with insulated clamps, compact case. The included shovel is small and plastic; it’s a start, and the folding aluminum one below is the upgrade if you drive where the plows are slow.
Fits: any vehicle. In a Tesla, note that the jumper cables connect to the low-voltage battery only, and only per the manual.
6. Getting unstuck: a real shovel and traction boards
A lot of winter strandings aren’t breakdowns. They’re a car off the shoulder in a snowbank, or a parking spot the plow buried overnight, and the driver spinning tires on ice. The fix is boring: dig the snow away from the tires and the underside, put something with grip under the drive wheels, and roll out slowly. The NWS adds a caution I’ll pass along as a nurse: “Avoid overexertion such as shoveling heavy snow, pushing a car or walking in deep snow if you are not in good health. The strain from the cold and the hard labor may cause a heart attack.” Dig a little, rest, dig a little. Ready.gov’s cheaper answer to traction is “cat litter or sand,” and a bag of either in the trunk is fine. The boards below are the reusable version that doesn’t get wet and freeze into a brick. The snow brush, wiper and mat side of winter is covered in the winter accessories roundup, so I don’t repeat it here.
AstroAI 38.4″ Folding Extendable Snow Shovel, Aluminum Blade
Why it’s here: a full-size shovel is the right tool and won’t fit in a Model 3 or Model Y. This one folds to “23 inches when folded” and extends to 38.4 inches in three steps, with an “aluminum alloy” blade and a “high-strength iron hinge,” per the listing. That’s long enough to dig without kneeling in slush and short enough to live under the trunk floor next to the roadside kit. The listing also notes the blade’s “pointed bulge easily breaks apart thin ice,” which is what you’ll find frozen against the tires after a night on the shoulder.
Per the listing: three-level adjustable handle to 38.4 inches, 23 inches folded, D-shaped grip, aluminum head, ABS-and-rubber shaft. Use it as a shovel; it’s not a pry bar.
Fits: any vehicle; sized for a trunk well or under a rear seat.
VEVOR Traction Boards, TPR, Pair, Roll-Up, Short
Why it’s here: the rigid plastic traction boards sold for off-roading are the size of a snowboard and don’t fit in a sedan. These are the flexible kind: the listing says the “soft and flexible design allows for easy roll-up storage in a carrying bag,” and rates the TPR material “suitable for use in extreme temperatures.” A pair goes under the wheels that are spinning, which on a rear-wheel-drive car is the back pair and on an all-wheel-drive car is whichever pair has lost grip. The listing rates them to “7 tons (15,432 lbs),” which is a truck number; a Model Y is a fraction of that.
Per the listing: TPR with an internal steel-core connection, non-slip textured surface, storage bags included, short version. Dig first, then place them tight against the tire tread, then roll out gently. Spinning the tires on them will chew the surface. For chains, and the short list Tesla allows on its wheels, see the snow chains guide.
Fits: any vehicle; the “short” size is the one that stores in a car.
7. The EV-only extra: a 12-volt heated blanket
This is the one item on the list that makes more sense in an EV than in a gas car. A heated blanket that plugs into the 12-volt outlet only works while the outlet is live, and in a gas car that means the engine is running, with the exhaust rule above. In a Tesla, Camp Mode keeps “the USB ports and low voltage outlet” powered along with the cabin heat, per the manual, so the blanket runs off the big battery while the car sits. A 12-volt blanket warms the person, not the air, and Tesla’s own winter page makes the same point about seat heaters: warming the person instead of the air “uses less energy than the cabin heater.” Treat it as a comfort item on top of the wool blanket, not a replacement. If the car has no power, neither does this.
Sealy 12-Volt Heated Car Blanket, 59″ x 43″
Why it’s here: it “plugs into the cigarette lighter,” has “3 heating levels” and a “4 hours auto off,” per the listing, and an “85 inches long power cord” that reaches the back seat, which is where a passenger sits in a stranding. The two USB ports on the controller add a place to charge phones. It’s machine washable with the controller unplugged.
Per the listing: 59 by 43 inches, 12-volt plug, two USB outputs at 2.5 A and 1 A, auto-off at four hours. The listing does not state the blanket’s wattage, so I can’t tell you its draw; check your model’s manual for the 12-volt outlet rating before you buy. Turn Camp Mode on before you plug it in so the outlet stays live.
Fits: any vehicle with a 12-volt outlet; useful in a gas car only while the engine runs.
8. Water and food, no link needed
Two things to know that most lists skip. First, water freezes, and a frozen bottle is useless for hours. Keep water in the cabin, not the trunk, and keep it in two or three small bottles rather than one gallon, because small bottles thaw against your body and a gallon doesn’t. Second, the NWS and the CDC both say the same thing about snow: don’t eat it. “Eating unmelted snow will lower your body temperature.” Melt it first if you must, in a bottle inside your coat. For food, the CDC’s advice is that “eating well-balanced meals will help you stay warmer,” and its list of what to avoid is short: alcohol and caffeine, because “they cause your body to lose heat faster.” Granola bars, nuts, and jerky keep for months and don’t freeze solid. Swap them every spring and fall when you swap the water. There’s nothing here to buy from me; buy it at the grocery store with the rest of the week’s food.
Where it all goes in a Tesla
Layout matters more in an EV than in a gas car for one reason: the CDC tells a stranded driver to “move anything you need from the trunk into the passenger area,” and in a storm you’d rather not have to. So split the kit. In the cabin, within reach of the driver’s seat: the bivy sacks, the hand warmers, the jump starter, the phone cable, the water, and the food. In the trunk well: the roadside kit, the wool blanket, the shovel, the traction boards, and the heated blanket. The coat lives on the back seat. That way the things that keep you alive in the first hour are already inside, and the things that get you moving again are where you’d go to get them anyway. If you’re building the rest of the car out, the Model Y accessories guide covers the organizers and trunk storage that make this split easy to keep.
Comparison table
| Item | Job in a stranding | Where it lives | Price tier |
|---|---|---|---|
| Sierra Madre bivy 2-pack | Holds body heat in; one per front seat | Cabin (door pocket / console) | Budget |
| EverOne 80% wool blanket | Insulation that works damp; covers two | Trunk well | Budget |
| HotHands 10-pair | Heat with no battery to die | Glovebox + console | Budget |
| GOOLOO A5 | Phone power, 12 V jump, tire inflator; charge above 14°F | Cabin, comes inside to charge | Mid |
| Tobfit LED flares 6-pack | Be seen; magnets on hood/trunk lid, discs on the road | Trunk well (lithium AAAs) | Budget |
| HAIPHAIK 142-pc roadside kit | Triangle, cables, tow rope, poncho, tools; the base layer | Trunk well | Budget |
| AstroAI folding shovel | Dig out; 23 in. folded | Trunk well | Mid |
| VEVOR roll-up traction boards | Grip under the drive wheels | Trunk well | Mid |
| Sealy 12 V heated blanket | Comfort while the car has power (Camp Mode) | Trunk well | Mid |
| Coat, hat, mittens, water, food, bright cloth | The parts you already own | Back seat / cabin | Free |
Frequently Asked Questions
Is it safe to sit in an EV with the heat on if I’m stranded in snow?
Yes, and safer than in a gas car for the specific reason the NWS and CDC warn about: there is no exhaust to block and no carbon monoxide to make. Use Keep Climate On or Camp Mode so the car doesn’t shut the heat off when you’d normally have walked away, and watch the charge level; Tesla’s manual says not to use those modes when the battery is low. The car will notify your phone if the climate turns off for any reason. Keep the bivy and blanket ready anyway. The heat is the backup, not the plan.
Should I keep the EV plugged in during a winter storm?
Yes. Tesla’s advice is to leave the car plugged in whenever possible in cold weather and to keep the charge above 50 percent when it isn’t plugged in, because a plugged-in car warms its battery from the wall instead of from itself. Its winter page adds that in temperatures “well below freezing” a standard 120-volt outlet may not keep up, but it still recommends leaving the car plugged in to keep the battery warm. At my house the cars charge on two Wall Connectors in the driveway and they’re plugged in every night, which is the whole reason a cold morning isn’t an event.
Does the jump starter really matter in an electric car?
It matters more than most owners think, because a Tesla’s 12-volt battery is the one that strands you, not the big one, and the cold is hard on it. If the 12-volt dies the car won’t wake, won’t unlock normally, and can’t use the energy in the main battery until the small one is revived. A jump starter with a power bank also solves the phone problem in the same box. The one caution: read the charging temperature on the listing. The GOOLOO won’t accept a charge below 14°F, so it can’t be topped up in a frozen car.
What’s the first sign of hypothermia I should watch for in a passenger?
Shivering, and then the moment it changes into confusion or clumsiness. The CDC lists shivering, exhaustion, confusion, fumbling hands, memory loss, slurred speech and drowsiness as the adult warning signs, and it says a body temperature below 95°F is an emergency. The one I’d underline is drowsiness. Someone getting quiet and sleepy in a cold car is not “settling in,” and the CDC’s advice for a stranding is to stay awake for exactly that reason. Get them into the bivy, put a hand warmer against their chest, and call for help.
Do I need all of this if I only drive in town?
You need the warmth, the phone power, and the flares, because a short drive on a closed interstate can turn into an hours-long sit, and that can happen in a city as easily as on a rural road. Skip the traction boards and the big shovel if you never leave plowed roads; the small shovel in the roadside kit will handle a buried parking spot. The bivy sacks and the hand warmers cost less than a tank of washer fluid, and they’re the two items worth putting in every car regardless.
Our Honest Verdict
If you’re worried about an EV in the cold, stop worrying about the car and start worrying about the kit, because the kit is what saves you in any car. The EV’s real winter advantage is that it heats a sealed cabin sitting still with nothing to poison you, and its real winter cost is range, which I lose 10 to 15 percent of and plan around by charging to 90 before a long cold trip.
Buy the two bivy sacks and the wool blanket first; they’re cheap and they’re what addresses the real danger, which is hypothermia. Add the hand warmers and the GOOLOO jump starter next, and keep the jump starter inside where it can charge. Then the LED flares, then the roadside kit as the base layer if you don’t already have one. The shovel and traction boards are for people who drive rural or unplowed roads; if you only drive in town, the small shovel in the roadside kit is enough. The heated 12-volt blanket is a comfort item that makes more sense in a Tesla than anywhere else, and it comes last.
Water, food, a coat, mittens and a red cloth come from your house, not from a store, and they’re not optional.