Outdoor safety by season: a month-by-month calendar

How to use this calendar

This calendar is written for people who run, ride, hike and walk alone in the United States. It groups the year by the risks that actually change your plans: how much daylight you have, how hot or cold it is, what the weather tends to do, and who else is out there with you (drivers in the dark, hunters in the woods, crowds on a holiday weekend).

The US is big, so treat each month as a prompt rather than a rule. January in Phoenix is not January in Minneapolis, and hunting seasons are set state by state. When a month mentions a risk, check your own local forecast, sunset time and state agency before you head out. For sunset and the latest time you can start and still finish before dark, use the Holler daylight tool.

Each season links to a deeper guide: running in the dark after daylight saving time ends, winter running safety, heat safety for runners and hikers, hunting season safety and running safely while traveling.

The year at a glance

Use this table as a quick scan before each month. The sections below explain each risk and link to the full guides. Regional differences are large, so check your own forecast, sunset and state rules.

The habits that stay the same all year

Some safety habits never go out of season. They matter most on the days you least expect trouble, which is why they work best as routine rather than as something you remember only in a storm.

• Tell one person where you are going and when you expect to be back. A clear message before a run takes a minute and gives the people at home something to act on.
• Set a return time you will actually meet, plus a little buffer. The return time calculator helps you pick one.
• Carry your phone charged, somewhere you can reach it with one hand, and carry ID or an emergency card in case you cannot speak for yourself.
• Check sunset before you start, not when the light starts to fade.
• Know that if you are hurt, the first call is 911. Your safety contact is the second line of help, not a replacement for emergency services.

Winter: December, January and February

December has the shortest days of the year. The earliest sunsets actually arrive in early December, a couple of weeks before the solstice, and most people who train after work now finish every weekday run in the dark. Lights front and rear, reflective material on the parts of you that move, and familiar lit routes do most of the work. Holiday shopping also puts more cars in parking lots and near stores at dusk, so pick routes that avoid them. Our answer on staying safe running alone at night covers the basics.

January is usually the coldest stretch. The CDC lists shivering, exhaustion, confusion, fumbling hands, memory loss, slurred speech and drowsiness as hypothermia warning signs in adults, and lists redness or pain, white or grayish-yellow skin, skin that feels firm or waxy, and numbness as frostbite signs. The National Weather Service notes that at a wind chill of minus 19 degrees Fahrenheit (0 degrees with a 15 mph wind), exposed skin can freeze in 30 minutes. Shorter loops close to home let you bail out if conditions are worse than they looked from the window.

February often brings freeze and thaw cycles, which means black ice in the morning on paths that were wet the night before. Slow down on bridges, shaded corners and downhill stretches, and consider traction devices for your shoes. A fall on ice is exactly the kind of moment where you might not be able to get up quickly, which is where a stationary alert or a return time earns its place.

The full winter checklist, including layering and keeping your phone battery alive in the cold, is in our winter running safety guide. For activity-specific tips, see staying safe running in winter and hiking in winter.

Spring: March, April and May

March is the month the clocks spring forward. Daylight saving time begins at 2 a.m. local time on the second Sunday of March, according to NIST (in 2027 that is March 14). Evening runs gain an hour of light overnight, while early-morning runs that were in daylight go back to starting in the dark for a few weeks. If you run before work, keep your lights charged through the end of March.

April brings thunderstorm season to much of the country. The National Weather Service is blunt about it: no place outside is safe when thunderstorms are in the area, and you should stay in a safe shelter at least 30 minutes after the last thunder. On an exposed trail, that means turning around at the first rumble rather than hoping the storm passes. Spring is also when trails are muddy and rivers run high from snowmelt, so a crossing that was knee-deep in September may not be safe at all.

May is when many people start longer outings again: first long rides, first real hikes of the year. Your fitness may not match your ambition yet, so build a turnaround time into the plan and share it. A trip plan with your route, turnaround and return time is worth writing for any outing where you will be out of easy reach, especially somewhere you may lose cell service. Spring turkey seasons also open in many states, so check your state wildlife agency before hiking in woods where hunting is allowed.

Summer: June, July and August

June has the longest days, which makes it the easiest month to fit a run or ride in daylight. It is also when heat starts to catch people out, especially early in the season before your body has adjusted. The CDC Yellow Book notes that with suitable daily exercise, most heat acclimatization changes happen within about 10 days, so ease into hot-weather training rather than jumping in.

July and August are peak heat for most of the US. The National Weather Service lists confusion, slurred speech, throbbing headache and hot, red, dry or damp skin among the signs of heat stroke, and says to call 911 or get the person to a hospital immediately. Heat illness matters for solo outings in a specific way: confusion can arrive before you realize you are in trouble, and you may not be able to call for help yourself. Run early, carry more water than you think you need, and set a return time so someone notices if you do not come back. The detail is in our heat safety guide for runners and hikers, with activity-specific tips for hiking in the heat and running in the heat.

Summer afternoons are also prime time for thunderstorms in many regions, especially in the mountains, where storms often build after midday. Plan high or exposed routes for the morning, and treat thunder as the signal to get off ridges and summits. In fire season, smoke can make hard efforts a bad idea even on a clear-looking day, so check your local air quality forecast before a long outing.

Fall: September, October and November

September feels like the easiest month of the year: cooler mornings, still-long evenings. But days are shortening quickly, and the sunset that felt comfortable on Labor Day is noticeably earlier by the end of the month. This is the month to check sunset times again and dig out your lights before you need them. The daylight tool shows sunset and the latest start time to finish before dark for your city.

October is when many states open archery and early firearm deer seasons, and fall turkey and small game seasons may overlap. Dates, hours and rules vary by state and even by county, so the right source is your state fish and wildlife agency, not a general article. The US Fish and Wildlife Service advises non-hunters to learn where and when hunting is taking place, stay on designated trails, wear bright clothing such as blaze orange, and put something bright on their dog. Our hunting season safety guide covers it in full.

November has the single biggest safety change of the year for evening exercisers. According to NIST, daylight saving time ends at 2 a.m. local time on the first Sunday of November, which in 2026 is Sunday, November 1. Clocks fall back an hour, and sunset by the clock jumps about an hour earlier overnight: in New York, from 5:55 p.m. on October 31 to 4:54 p.m. on November 1. A 5:30 p.m. run that finished in daylight on Friday finishes in the dark on Monday. Our guide to running in the dark after daylight saving time ends covers visibility, route changes and how to share a darker run, and the daylight tool shows your city's new sunset. Thanksgiving week adds holiday travel and plenty of runs in unfamiliar places.

Travel, holidays and the months you are away from home

Summer vacations, Thanksgiving, the December holidays and spring break are when many people run or hike somewhere new. Unfamiliar routes, different traffic rules, a different emergency number abroad and a safety contact who may be asleep in another time zone all change the plan. Our guide to running safely while traveling walks through scouting a route, asking locals, and sharing your outing with someone at home.

Holiday mornings also have a quieter quirk: familiar routes can be emptier than usual, with fewer people around to notice if something goes wrong. That is not a reason to stay in. It is a reason to make sure someone knows your route and return time, even on a short loop around the neighborhood.

A quick checklist for each change of season

Four times a year, spend ten minutes resetting your setup. These are small tasks that are easy to forget until the day you need them.

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