Keep your phone warm in an inside pocket, prepare offline navigation before you leave, and reduce screen and radio use on the trail. Cold can temporarily cut available battery life, shut a phone down, or stop it charging; a phone should not be your only navigation or emergency plan.
Why cold affects a phone battery
Cold can temporarily reduce battery performance. A phone may lose usable battery life faster than expected, shut down, or refuse to charge while it is too cold. That does not necessarily mean the battery has permanently failed: Apple says battery performance returns to normal after an iPhone or iPad returns to a higher ambient temperature.
Apple specifies an operating ambient range of 0°C to 35°C (32°F to 95°F) for iPhone and iPad. Outside that range, very cold conditions may temporarily shorten battery life or cause shutdown, and charging may pause or stop. Apple’s figures apply to its devices, not every Android phone or power bank; check the manufacturer’s guidance for your equipment. Apple also describes 16°C to 22°C (62°F to 72°F) as an ideal battery comfort zone, not a cutoff below which an iPhone abruptly stops working. Apple’s temperature guidance and battery performance guidance explain these limits.
Prepare your phone before the hike
- Charge it before you leave. Start with a full battery so you are not relying on a cold phone to charge at the trailhead.
- Download your route map for offline use. Open it before departure and check that you can view the route without a data connection. The National Park Service recommends downloading a map to your phone and carrying a physical backup in its Ten Essentials guidance.
- Set up power-saving choices. Dim the screen and avoid leaving it on between checks. If you do not need cellular connectivity, use airplane mode; searching for weak or absent service can drain the battery. REI offers further phone battery-saving advice for backcountry trips.
- Pack backup power for your expected use. A portable power bank is useful for longer trips or frequent navigation, GPS tracking, and photography. Choose capacity by weighing trip duration and likely phone use against the bank’s weight; there is no universally right capacity. Bring a compatible cable and protect the bank from moisture.
Keep the phone and power bank warm
When you are not actively using the phone, carry it in an inner clothing pocket close to your body rather than leaving it exposed in an outer pack pocket. Body heat helps keep batteries warm. Apply the same principle to a power bank: keep it close to your body and protected from moisture, then connect it when you need backup power. The National Park Service recommends keeping batteries warm in its remote base-camping advice; REI also recommends keeping electronics near the body in cold weather.
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Take the phone out when you need it, then return it to the warm pocket rather than leaving it exposed for an extended period. Cold-weather performance can differ from indoor behavior, so do not assume a cold phone or bank will charge as it normally does.
Use a navigation and emergency backup
A downloaded phone map is useful, but it should not be your sole navigation plan. Carry a physical map and compass, and know how to use them. The National Park Service advises hikers to bring a physical map as a backup and to know how to use a topographic map, compass, or GPS in its Ten Essentials guidance. REI’s Ten Essentials for Hiking & Camping also covers navigation basics.
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On a route without dependable cellular coverage, consider whether a satellite communicator or personal locator beacon (PLB) fits your needs. The right choice depends on coverage, whether you need messaging or SOS capability, and the device’s service requirements in your region. A phone alone cannot provide reliable emergency communication where there is no cellular service.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.If the phone shuts down or will not charge
Move it to a warmer environment and follow its manufacturer’s temperature guidance. Apple says cold-related battery reduction is temporary and that charging may pause in extreme temperatures until the battery returns to its normal operating range. Its guidance does not specify a recovery time, so do not count on a quick restart or charge. Avoid relying on an unverified rapid-heating method.
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