Winter running and walking: how to layer for the cold
For cold-weather running, dress as if it is about 20 degrees warmer than the actual temperature, so you feel slightly chilly at the start. Wear a wicking base layer, an insulating layer as it gets colder, and a wind-resistant shell, plus gloves and a hat below about 40°F. Walkers make less heat, so they need warmer layers than runners.
Should you dress warmer or cooler for a winter run?
Cooler. Dr. Ed Kornoelje of University of Michigan Health-West advises dressing as if it is about 20 degrees warmer than the actual temperature, and says you should feel slightly chilly at the start of your run. Running specialty retailer Fleet Feet gives a similar range of 10 to 20 degrees warmer.
The reason is heat production. Exercise creates body heat, as the American College of Sports Medicine (ACSM) notes, and a runner who feels warm at the door will be sweating within minutes. Sweat-soaked layers then chill you on the way home or whenever you slow down.
Walking is different. A brisk walk makes much less heat than a run, so walkers should dress closer to the real temperature and keep an extra layer handy. The same applies to run-walk intervals and long warm-ups.
How should you layer for cold-weather running?
The ACSM describes three layers: an inner layer in direct contact with the skin that absorbs moisture, such as wicking wool; a middle layer that traps body heat; and an outer layer that is waterproof, windproof and breathable, ideally with underarm zippers or vents to release heat.
Mayo Clinic's sports medicine team recommends layers you can remove as soon as you start to sweat and put back on as needed, with synthetic wicking fabric such as polypropylene next to the skin, then fleece or wool. For runners, the middle layer is often thin; for walkers, it usually does most of the work. Our base layer guide compares merino, synthetics and cotton in detail.
What should you wear running at 40, 30, 20 and 10 degrees?
Use the table as a starting point, then adjust for wind, sun, pace and how warm you run. The bands below 40°F follow Fleet Feet's guide; the 40s row reflects University of Michigan Health-West's advice that gloves and a hat are usually wanted below 40 degrees. The table assumes running; walkers usually need an extra insulating layer beyond it.
| Air temperature | Top | Bottom | Extras |
|---|---|---|---|
| 40s°F | Long-sleeve wicking layer | Tights or light pants | Light gloves and hat as it drops below 40°F |
| 30 to 40°F | Base layer plus fleece mid layer, or shell or vest | Leggings | Light gloves; hat or earband optional |
| 20 to 30°F | Base, mid and outer layer | Fleece-lined tights or thicker pants | Gloves and hat or earband |
| 10 to 20°F | Base, mid and outer layer | Warmest leggings | Hat, gloves, neck gaiter |
| 0 to 10°F | Base, mid and outer layer | Double-lined leggings, long socks | Hat, gloves, gaiter over mouth and nose |
How do you keep hands, feet and ears warm on a winter run?
Extremities go first. Mayo Clinic explains that in the cold, blood flow is concentrated in the body's core, leaving the head, hands and feet vulnerable to frostbite. It recommends thermal socks in shoes with room for them, wicking glove liners under heavier mittens, a hat and face protection.
The ACSM suggests thinner gloves under mittens for dexterity and changing socks if they get sweaty. REI recommends merino or synthetic socks at least crew length, and a beanie, balaclava or headband in a wicking fabric rather than cotton.
Hands: liner gloves for mild days, mittens over liners for the coldest runs.
Feet: wool or synthetic socks, and shoes that are not tight over them.
Head and face: hat or earband, plus a gaiter you can pull over the mouth and nose.
How do you stay safe on ice and in the dark?
Ice and darkness add risks that have nothing to do with temperature. Mayo Clinic advises footwear with enough traction to prevent falls on ice and snow. University of Michigan Health-West notes that slip-on traction devices and winter running shoes can help, and REI describes spikes that fit over running shoe soles.
Short days mean more miles in the dark. Mayo Clinic recommends reflective clothing if you exercise in darkness, and REI suggests a headlamp and a reflective vest bright enough to alert drivers, cyclists and pedestrians.
When is it too cold to run or walk outside?
Wind chill is the number to watch. Mayo Clinic says that at wind chills below minus 18°F, frostbite can occur on exposed skin in 30 minutes or less, and suggests considering indoor options when temperatures drop below 0°F or wind chill is extreme. University of Michigan Health-West advises staying inside if the wind chill drops below minus 20 degrees.
Stop and head indoors if you notice numbness, pale or waxy patches of skin, or shivering that will not settle. The ACSM lists feeling cold, skin numbness and pale spots as warning signs. If you have asthma, heart or lung disease, Raynaud's or lupus, Mayo Clinic advises checking with your doctor first; talk to a clinician about any symptoms the cold brings on.
Key takeaways
Runners should dress for about 20 degrees warmer than the real temperature and start slightly chilly.
Walkers make less heat, so dress closer to the actual temperature and carry a spare layer.
Use a wicking base, an insulating mid layer as needed, and a vented windproof shell.
Protect hands, feet and face first; add traction and reflective gear in winter.
Move indoors when wind chill is extreme or you notice numbness or pale skin.
Frequently asked questions
What should I wear running in 30 degree weather?
A common setup is a base layer with a light fleece or shell, leggings, light gloves and a hat or earband. Fleet Feet lists base plus mid layer or shell for 30 to 40°F, and base, mid and outer layers for 20 to 30°F. Add wind protection if it is breezy.
Is it bad to run in the cold?
For most healthy people, running in the cold is safe with the right clothing and sensible limits. Risks rise with extreme wind chill, wet clothing and icy footing. People with asthma, heart or lung disease should check with their doctor first.
Should I wear a jacket for a winter walk?
Usually yes. Walking generates less heat than running, so walkers generally need an insulating layer and a windproof shell on cold days. Vent or remove layers if you start to sweat.
Can you get frostbite from running in the cold?
Yes, on exposed skin in severe conditions. Mayo Clinic notes frostbite can occur in 30 minutes or less at wind chills below minus 18°F. Cover the face, ears and hands, and go inside if skin turns numb or pale.
Are cotton clothes okay for winter running?
Cotton is a poor choice for runs. It soaks up sweat and dries slowly, and REI advises skipping it for hats and socks in favor of merino wool or synthetics. Save cotton for after the run.
Related reading
Sources
Running In Cold Weather: How to Keep the Momentum Going, University of Michigan Health-West
Exercising in the Cold: Chilled, not Shaking, American College of Sports Medicine
Exercising outdoors in winter, Mayo Clinic Orthopedics and Sports Medicine
Mayo Clinic Q and A: Exercise safety in cold weather, Mayo Clinic News Network
How to Dress in Layers for Cold Weather, Fleet Feet
The Best Cold Weather Running Gear, REI Expert Advice
About HEATJAC. HEATJAC is a thermal architecture company founded by an anesthesiologist. We design patented garment systems that capture, conduct and broaden warmth across the body, and we publish this knowledge hub because the science of staying warm should be public. HEATJAC products are not medical devices and are not intended to diagnose, treat, cure or prevent any disease.