How to Treat Frostbite: First Aid, Rewarming, and Prevention for Cold-Weather Hikers

Frostbite happens when skin and the tissue underneath it freeze from prolonged exposure to cold temperatures, most often affecting fingers, toes, ears, nose, and cheeks. It’s a real risk for anyone hiking, camping, or paddling in cold, windy, or wet conditions, and it can progress faster than people expect. Knowing how to spot it early and respond correctly can be the difference between a full recovery and lasting tissue damage.

Recognizing the Stages of Frostbite

Frostbite develops in stages, and catching it early makes a big difference.

Frostnip (Early Warning Stage)

This is the mildest form and a signal to act immediately. Signs include:

• Cold, tingling, or numb skin
• Skin that looks red, white, or pale
• Mild discomfort or a pins-and-needles feeling

Frostnip doesn’t cause permanent damage if you warm the area promptly.

Superficial Frostbite

• Skin appears white, pale, or grayish-yellow
• Skin may feel firm on the surface but soft underneath
• Stinging, burning, or swelling as the area is warmed
• Possible blistering 12-36 hours after rewarming

Deep (Severe) Frostbite

• Skin turns white, blue-gray, or waxy-looking
• The area feels hard and cold, with complete numbness
• Joints or muscles may stop working properly
• Large, blood-filled blisters can form after rewarming
• Skin may eventually turn black as tissue dies

Deep frostbite is a medical emergency and requires professional treatment as soon as possible.

First Aid Steps for Frostbite

1. Get Out of the Cold

Move to a warm, dry shelter as soon as possible. Remove any wet clothing, jewelry, or tight gear that could restrict blood flow to the affected area.

2. Do Not Rub or Massage the Area

This is one of the most important rules of frostbite first aid. Rubbing frozen skin can cause further damage to the delicate, ice-crystal-filled tissue. Never rub frostbitten skin with your hands or snow.

3. Rewarm Gradually With Warm (Not Hot) Water

If you’re somewhere you can’t get proper medical care quickly and there’s no risk of the area refreezing, rewarm the frostbitten skin in warm water between 99-108°F (37-42°C) — warm to the touch, not hot. Soak the area for 20-30 minutes until it turns red or pink and feels warm. Never use direct heat sources like a campfire, heating pad, or car heater vent, since numb skin can burn without you realizing it.

4. Avoid Refreezing

Only rewarm the area if you’re confident it won’t refreeze before you reach proper shelter or care. Refreezing thawed tissue causes significantly more damage than leaving it frozen until you can rewarm it safely once.

5. Protect the Area After Rewarming

Loosely wrap the area in a clean, dry cloth or bandage. Separate affected fingers and toes with dry gauze. Avoid popping any blisters that form. Elevate the affected limb if possible to reduce swelling.

6. Manage Pain

Rewarming frostbitten skin can be quite painful as sensation returns. Over-the-counter pain relievers like ibuprofen can help, used as directed on the label.

When to Seek Emergency Medical Care

Seek professional medical attention right away for:

• Any signs of deep frostbite (hard, waxy, blue-gray, or numb skin)
• Large blisters, especially blood-filled ones
• Skin that stays white, gray, or numb after rewarming
• Signs of infection: increasing redness, warmth, pus, or fever
• Suspected hypothermia alongside frostbite (confusion, intense shivering, or slurred speech)

This guide covers general first-aid steps and is not a substitute for professional medical evaluation. Frostbite severity can be hard to judge in the field, so when in doubt, get it checked by a medical provider, ideally one experienced with cold-weather injuries.

How to Prevent Frostbite on the Trail

• Dress in warm, moisture-wicking layers. Wet skin loses heat far faster than dry skin, so avoid cotton next to your body and prioritize wool or synthetic base layers.
• Cover exposed skin. Use insulated gloves, wool socks, a hat, and a face covering in windy or extremely cold conditions. Fingers, toes, ears, and the nose are the most vulnerable spots.
• Keep extremities dry. Change wet socks and gloves as soon as you can, and pack backup pairs on any cold-weather trip.
• Watch the wind chill, not just the temperature. Wind dramatically speeds up heat loss and frostbite risk, even at temperatures that don’t seem extreme.
• Choose the right sleeping bag for the conditions. An underrated sleeping bag is a common cause of overnight cold exposure on winter camping trips. See our guide on how to choose a sleeping bag for camping for temperature-rating guidance.
• Eat and hydrate well. Your body needs fuel to generate heat; skipping food or getting dehydrated makes you more susceptible to cold injury.
• Check in on your extremities regularly. Wiggle fingers and toes periodically and check for numbness, and turn back or seek shelter at the first sign of frostnip.
• Know your limits and the forecast. Check weather and wind chill before heading out, and have a turnaround plan for extreme conditions.

Frostbite is the cold-weather counterpart to heat-related injuries like heat exhaustion. If you’re hiking across seasons, it’s worth reading our guide on how to treat heat exhaustion as well, since both are examples of how your body’s temperature regulation can be overwhelmed by the environment.

If you’re also dealing with other cold- or trail-related injuries, our guides on treating a sprained ankle at home and treating a minor burn at home cover related first-aid basics for common outdoor injuries.

Frequently Asked Questions

How quickly can frostbite happen?

In extreme wind chill (around -15°F/-26°C or colder), exposed skin can develop frostbite in as little as 30 minutes. In less extreme but still cold and windy conditions, it can take longer, but risk increases significantly with wet skin, wind, and prolonged exposure.

Can frostbite be reversed?

Frostnip and superficial frostbite generally resolve fully with prompt, proper rewarming. Deep frostbite can cause permanent tissue damage, which is why fast recognition and professional medical care are so important for more severe cases.

Is it okay to walk on frostbitten feet?

Avoid walking on frostbitten feet if at all possible, especially after they’ve been rewarmed, since this can cause further tissue damage. If you must move to reach safety, it’s generally safer to walk on still-frozen feet than on ones that have been thawed and could refreeze.

Should I pop frostbite blisters?

No. Leave blisters intact and let a medical professional evaluate and manage them. Popping blisters increases the risk of infection and can worsen tissue damage.

What’s the difference between frostbite and hypothermia?

Frostbite is localized freezing of skin and tissue, usually in the extremities or face. Hypothermia is a whole-body condition where core body temperature drops dangerously low. The two can occur together, and hypothermia is the more immediately life-threatening of the two, so always address it first if both are suspected.