You are on a normal highway when an accident closes the road. Snow keeps falling, temperatures drop, and the expected delay stretches to six or eight hours. Your car still works—but you cannot go anywhere.
In that situation, jumper cables and a small shovel are only part of the answer. You need enough warmth, drinking water, communication power and personal supplies for everyone inside the vehicle.
This winter car emergency kit focuses on waiting safely through a prolonged delay. It complements our general car emergency kit guide with the cold-weather supplies and decisions that matter when help cannot arrive quickly.
Pack for the people first: Warm clothing and substantial blankets or sleeping bags for every occupant, accessible water and food, a charged phone power bank, lighting and essential medication. Add snow-clearing and roadside equipment afterward. A kit's advertised piece count does not tell you whether it can keep your family warm.
In This Guide
Stranded for Six to Eight Hours: What Should You Do?
A six-hour estimate is not a guaranteed reopening time. Prepare for the delay to extend into darkness or overnight, especially when the weather is worsening.
- Follow official directions. Check state transportation alerts, road signs and instructions from responders. Do not use the shoulder as an escape route or bypass a closure.
- Assess immediate danger. Fire, a suspected exhaust problem, a medical emergency or an unsafe vehicle position changes the situation. Call 911 when there is an immediate threat.
- Tell someone where you are. Share the road, direction, nearest exit or mile marker, location pin, vehicle description and number of occupants.
- Get supplies within reach. Bring essential clothing, blankets, food and water into the cabin when it is safe to access them.
- Put on warm layers early. Do not wait until everyone is shivering. Keep clothing dry and minimize unnecessary door opening.
- Monitor everyone. Pay particular attention to children, older adults and anyone with medical needs. Seek help early if warmth, medication, fuel or charge is becoming a problem.
During blowing snow, staying with the vehicle is generally safer than walking off to find help. Leave when responders direct you or remaining creates immediate danger; do not assume a distant light means reachable shelter.
The National Weather Service's stranded-vehicle guidance explains why people can quickly become disoriented outside.
What Should Be in a Winter Car Emergency Kit?
Build around your usual passenger count, local temperatures and longest likely route. A kit for one adult driving across town is not enough for a family crossing a mountain pass.
| Priority | What to Pack | Why It Matters |
|---|---|---|
| Warmth for everyone | Substantial blankets or suitable sleeping bags; hats, insulated gloves, dry socks and extra layers. | You need protection that does not depend entirely on a running heater. |
| Communication | Charged phone, compatible cable, vehicle charger and charged power bank. | Supports calls, messages, location sharing and official updates. |
| Food and water | Drinking water and ready-to-eat food suitable for each occupant. | A road closure can keep shops and services out of reach. |
| Light and visibility | LED headlamp or flashlight, spare batteries, reflective vest and suitable warning equipment. | Helps you locate supplies and be seen without an open flame. |
| Health and personal needs | First-aid supplies, required medication, glasses, wipes, tissues and sanitation supplies. | A basic roadside kit rarely covers individual medical or personal needs. |
| Snow removal | Sturdy compact shovel, snow brush and ice scraper. | Useful for clearing access and snow around the vehicle when conditions permit. |
| Vehicle support | Compatible jump-start equipment, traction aid and any required, approved tire chains. | Helps with some minor problems once movement is safe and permitted. |
The National Weather Service winter supply checklist provides a useful starting point. Add passenger-specific supplies rather than treating a generic list as complete.
Keep the Essential Bag Inside the Cabin
Secure a small bag containing warm accessories, lighting, phone power, snacks and essential personal items where an occupant can reach it. Store heavier tools securely in the cargo area.
A blanket under luggage in an inaccessible trunk may be little help during a dangerous roadside stop. Do not leave heavy equipment loose where it could become a projectile in a crash.
Snow Pants, Boots, Gloves and a Parka: What Is Actually Useful?
Carry clothing appropriate for being outdoors in the expected weather, even if you normally drive wearing a light jacket and office shoes.
- Insulated coat or parka: Useful in the cabin and for a necessary brief exit.
- Winter hat or toque: Pack one for each passenger.
- Insulated gloves or mittens: Thin fleece gloves may be inadequate for prolonged bitter cold.
- Warm, weather-resistant boots: Particularly important if you normally wear dress shoes.
- Dry socks and an insulating layer: Keep them in a water-resistant bag.
- Snow pants: Worth considering for severe climates, remote routes or possible time outside.
- Goggles: An optional addition for blowing-snow conditions, not a reason to venture into a storm.
A foil emergency blanket is a useful backup, but do not make a thin reflective sheet your only insulation for hours in severe cold. Bring substantial bedding appropriate to the conditions.
The American Red Cross recommends warm clothing, blankets and boots among vehicle emergency supplies.
Keep Children Warm Without Compromising Their Harness
Bulky coats and snowsuits should not go underneath a child-seat harness. Use properly fitted clothing and harnesses, then place a blanket or coat over the secured child for warmth.
Source: NHTSA winter car-seat guidance. Keep occupants properly restrained whenever the vehicle may move.
Can You Run the Engine to Stay Warm?
For a stranded combustion-engine vehicle, the National Weather Service describes running the engine for about 10 minutes each hour, with the exhaust clear and a window opened slightly.
This is general emergency guidance, not a guarantee of safe air or adequate warmth. Conditions, vehicle damage and snow accumulation matter. A slightly open window does not make a blocked or leaking exhaust safe.
- Check that the tailpipe and surrounding exhaust outlet area are clear before running the engine.
- Recheck as snow drifts or accumulates—but only when you can do so without entering dangerous traffic or exposure.
- If you cannot maintain a clear exhaust outlet, do not run the engine; request help and use your insulation.
- Do not leave the engine running while everyone sleeps.
- Never run the vehicle inside an enclosed space to keep warm.
Red Cross guidance hosted by the National Weather Service also notes that carbon monoxide can accumulate even when the exhaust pipe is clear.
Carbon Monoxide Has No Warning Smell
Carbon monoxide is colorless and odorless. Headache, dizziness, nausea, weakness or confusion may indicate exposure. If poisoning is suspected, stop the engine, call 911 and get everyone to fresh air as safely as possible, following emergency instructions.
Source: CDC carbon monoxide guidance.
What About Hybrids and Electric Vehicles?
A hybrid or plug-in hybrid can start its gasoline engine automatically while switched on. Exhaust precautions still apply.
A battery-electric vehicle has no engine exhaust, but heating uses stored energy. Follow its manual for stationary climate operation and monitor charge. There is no universal number of hours an EV can keep everyone warm.
Before winter travel, learn the vehicle's emergency door operation. See Tesla Emergency Door Release Safety Guide.
Do not improvise a cabin heater: Do not use candles, charcoal, a camping stove or another fuel-burning device inside the vehicle. Use LED lighting and insulating layers. A candle included in a commercial kit is not permission to burn it beside upholstery and blankets.
Food, Water and the Supplies People Forget
Bring Water That You Can Actually Drink
Water left in a vehicle can freeze. For winter trips, bring fresh water from indoors in suitable containers and keep it in an insulated bag within reach. Insulation slows freezing; it does not prevent it indefinitely.
Pack for everyone, including pets, and allow for a longer delay than expected. Do not eat snow to hydrate: it cools your body.
Choose Food That Requires No Cooking
Pack familiar ready-to-eat options such as crackers, nut butter packets, dried fruit or other foods that suit your household's allergies and dietary needs. Some bars become very hard when cold, so check what you are packing.
Keep food sealed and rotate it before expiration. A stove and canned meal that requires heating are less useful than food you can safely eat immediately.
Add a Small Personal-Supplies Bag
- Essential medication and a current medication list.
- Baby feeding supplies, diapers and spare clothing where needed.
- Pet food, water, a leash and warm bedding.
- Tissues, wipes, sealable waste bags and an appropriate portable urinal or toilet bag.
- Spare glasses and needed accessibility supplies.
Temperature-sensitive medication should travel with you according to its storage instructions, rather than remaining in a freezing car all winter.
A Shovel Helps. A Tow Strap Is Not a Rescue Plan.
A compact shovel and traction aid can help with a minor stuck-vehicle situation. They cannot reopen a highway or make a closed road safe.
Use recovery equipment only when you understand the vehicle's approved procedures. Improvised towing attachments and mismatched straps can cause serious injury. For most drivers, professional recovery is a better plan than attempting a roadside pull in a snowstorm.
Likewise, place warning triangles or other equipment only when doing so will not expose you to passing traffic. Prefer battery-powered warning lights to flame-based flares near a vehicle.
Avoid exhausting yourself by digging or pushing. The National Weather Service cautions against overexertion during winter emergencies.
What Does an AAA Winter Car Emergency Kit Contain?
There is no single universal AAA kit. Contents vary by product, seller and version.
The example packing list for the AAA Winter Roadside Emergency Kit includes a case, flashlight, folding shovel, scraper, safety strobe, fleece accessories, hand warmers, a survival blanket and basic first-aid items. Check the seller's current contents before ordering.
Some versions or lists also include candles and a fire starter. Those items do not make the kit suitable for heating a car interior.
What Would You Still Need to Add?
- Substantial warmth for every passenger—not just one small blanket.
- Drinking water and food.
- Phone power and cables.
- Proper boots, dry layers and personal medication.
- Supplies for children, pets and sanitation.
A membership brochure is not roadside-assistance membership. Also, dozens of small bandages can inflate a kit's piece count without adding anything to its ability to support a long winter wait.
What Should You Not Rely On?
- The car heater alone: The vehicle may stop working or lack sufficient fuel or charge.
- A single thin emergency blanket: Plan substantial insulation for each person.
- Frozen water and unusable food: Check supplies before departure.
- An uncharged jump pack or power bank: Follow its charging and temperature instructions.
- Expired first-aid supplies or improperly stored medication: Inspect and replace them.
- Loose fuel containers or improvised cabin heaters: They introduce hazards rather than dependable warmth.
- A guaranteed rescue time: Roadside services can also be delayed by closures and severe weather.
Use chemical hand warmers according to their instructions. They supplement clothing; they do not replace it. Avoid direct skin contact where prohibited, and take particular care with children or anyone with reduced sensation.
Frequently Asked Questions
What is the best survival kit to keep in my car?
The best fit is a kit built around your climate, route and passengers. A commercial roadside kit can provide a starting point, but add substantial insulation, water, food, communication power and personal necessities.
What are the three P's of winter driving?
Prepare for the trip, protect yourself and prevent crashes. These appear in OSHA's winter-driving guidance. Preparing includes supplies and vehicle checks; protection includes restraints; prevention includes adapting your driving and avoiding unsafe travel.
How long can a car sit unused in winter?
There is no single limit. Battery condition, temperature, electrical draw and the vehicle's storage instructions matter. An unoccupied parked car is also a different question from keeping occupants warm. Do not use a parking-duration estimate as a survival plan.
Can I sleep while waiting in the car?
Do not let everyone sleep with the engine running. Stay alert to changing conditions and signs of illness. If multiple adults are present, maintain an awake person to monitor the situation. Unusual drowsiness can signal a medical problem, not simply tiredness.
How can I survive living in my car in winter?
A roadside emergency kit is not sufficient protection for repeated nights in severe cold. Seek a warming center, shelter or other heated accommodation; in many U.S. communities, 211 can help locate services. Call 911 for immediate danger. Never depend on continuous idling or an improvised fuel-burning heater.
When should I call for emergency medical help?
Confusion, slurred speech, fumbling hands, unusual drowsiness or worsening cold symptoms need urgent attention. Suspected hypothermia is an emergency. Do not wait for a temperature reading before requesting help. See the CDC's winter emergency guidance.
Pack for a Long Wait Before You Need to Take One
For a six-to-eight-hour winter road closure, prioritize keeping everyone warm, supplied and reachable. Recovery tools matter, but they do not replace sleeping bags, dry clothing, drinking water or phone power.
Before your next winter trip, check one thing: could every person in this vehicle stay protected if the heater stopped working? If the answer depends on one small foil blanket, add more insulation before you leave.
Related Winter Protection Guides
- Is Your Car Ready for a Snowstorm? What to Check Before You Leave
- Car Heater Blowing Cold Air: Simple Fix or Expensive Repair?
- Coolant Flush Before Winter: Necessary Protection or Another Upsell?
- Winter Car Checklist: What to Check Before the First Freeze
- Winter Car Prep: What You Actually Need—and What Shops Upsell
- Can You Use Winter Tires All Year? What Drivers Need to Know
- Summer vs Winter vs All-Season vs All-Weather Tires: Which Is Best?
- Do You Need Winter Wiper Blades—or Are Regular Wipers Good Enough?
- Winter Windshield Washer Fluid: Do You Need It—or Is Summer Fluid Good Enough?
- Road Salt Is Eating Your Car: How Often Should You Wash the Undercarriage?
- Saltwater Is Eating Your Car: Can Undercoating Stop the Rust?
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