How cold is too cold for recess?

The short answer

There is no national rule for how cold is too cold for recess. Each school, district or child care licensing body sets its own line. The written lines read for this page run from 22 F down to -10 F wind chill for school recess.

The firmest number comes from child care guidance. Caring for Our Children is the national health and safety standard for child care in the US. Its standard on outdoor play says weather with a "significant health risk includes wind chill factor below -15°F"³. That is guidance, not law. It sits just above the point where the National Weather Service chart starts to show frostbite within 30 minutes, at about -19 F¹².

Two answers circulate. One says recess should move inside below freezing. The other says children can go out down to zero or below. The frostbite science backs the second for children who are dressed for it. Exposed skin cannot get frostbite unless the air itself is below 32 F¹. So a 32 F or 22 F cutoff is a comfort and supervision choice, not a frostbite line. Babies and toddlers are the exception, and the rules treat them that way.

What wind chill means

Wind chill is the number the cutoffs are built on, so it is worth getting right. The National Weather Service defines it as "how cold people and animals feel when outside"¹. It is based on how fast wind and cold pull heat from bare skin. More wind means faster heat loss, so it feels colder than the thermometer says.

A few limits matter for recess:

• It needs wind and cold. The NWS defines wind chill only at 50 F or below, with wind over 3 mph¹. On a still day, use the air temperature.
• It assumes no sun. Bright sunshine can raise the wind chill by 10 F to 18 F¹.
• It was tested on adults. The NWS says it did not use child volunteers. It tells adults to use the chart as a starting point and "be even more cautious with children"¹.
• It does not cool objects below the air. A slide or a railing gets no colder than the air temperature, however hard the wind blows¹.

The NWS gives one example. At 0 F with a 15 mph wind, the wind chill is -19 F. At that wind chill, "exposed skin can freeze in 30 minutes"¹. On the printed chart, the 30 minute frostbite band starts there. Colder still come the 10 minute and 5 minute bands².

Every written cutoff, side by side

Here are the lines read for this page. The first five rows are child care guidance and rules. The last six are school recess policies from six districts in four states.

The spread is 32 degrees, from 22 F in Massachusetts to -10 F in Minnesota and North Dakota. Here the colder states set the colder lines, but no source read here explains its own number. Minneapolis says its line "aligns with common practice across Minnesota districts and pediatric safety guidance regarding frostbite risk"¹². Bismarck says it uses the NWS website, and that a sheltered or open school site can vary from the rule¹⁵.

One cold morning, walked through every rule

Take a recess at 20 F air temperature with a 10 mph wind. That is an ordinary January day across much of the northern US. On the NWS chart, the wind chill is 9 F². The Iowa chart shows the same 9 F⁷.

Now run that morning through each line:

So on one morning, two schools hold recess inside and four send children out. A Wisconsin center keeps its infants in and takes its preschoolers out. None of these outcomes is wrong under its own rule. They are different rules.

Two details in the table catch people out. Washington's rule says "cold less than 20 degrees Fahrenheit" and does not say whether that means the air or the wind chill⁶. And the Iowa chart's red is not a full stop for everyone. Its 2010 text says "most children should not play outdoors" in red, while older children "may play outdoors for very short periods of time if they are properly dressed"⁷⁸. Georgia's current copy says the same: older children may go out "for a very limited time"⁹.

Why there is no national rule

No federal law covers recess at all. The state recess laws set daily minutes and grades, not temperatures. The ones that mention weather leave the call to the school; California, for example, wants recess outdoors whenever weather and air quality permit. State recess laws lists every one.

Child care is closer to a rule, because states license it. Wisconsin's center rule requires "daily outdoor activities except during inclement weather" for centers open more than 3 hours a day⁵. It then defines inclement weather with numbers⁴. Washington's rule lists cold among the conditions a provider must watch and act on⁶. Five of the six state rules compared in daycare outdoor time requirements use words like "weather permitting" and stop there. Caring for Our Children fills the gap for programs that want a number, but it binds no one unless a state adopts it³.

Wisconsin's rule is also changing. From August 1, 2027, its age line moves from 18 months to 2 years. A wind chill of 20 F or below will then be inclement for children under 2⁴.

Babies and toddlers get a warmer line

Every source that treats ages separately is stricter for the youngest. Wisconsin sets 20 F for children under 18 months, 20 degrees warmer than the line for older children⁴. The Iowa chart says infants and toddlers "are unable to tell the child care provider if they are too hot or cold"⁷. In its red band they "should play indoors and have ample space for large motor play"⁷.

The chart adds that infants and toddlers "will tolerate shorter periods of outdoor play"⁷. Daycare outdoor time requirements covers the daily minutes the cold has to fit around, and childcare playgrounds covers the yard itself.

What to do on the days in between

The cutoff is only one decision. On a cold day that is still above it, the sources agree on the rest:

Missing gear is the usual reason a child cannot go out. Wrentham says parents may be called to bring clothing, and its schools keep no spares¹¹. Minneapolis offers to connect families with help to get winter clothing¹². Elkhart reminds families to send gloves "without strings"¹⁰. Strings and scarves are a strangling risk on equipment, which protrusion and entanglement explains.

Staffing matters too. Someone has to watch faces and fingers as well as the game, so the cold day plan belongs in supervision. For the yard and the indoor fallback, see school playgrounds.

Where this answer stops

This page covers cold air and wind on children's skin. It does not cover frozen ground. A playground can be fine for running at 25 F while the surfacing under a climber is frozen hard. That is a fall risk, not a cold risk, and playground on frozen ground covers it. Ice, snow at a slide exit and slippery ski pants belong there too.

The wind chill index was built on adults, and the NWS says to be more careful with children¹. No source read here tested children, and none sets a safe time outside at a given wind chill. A child with a health condition that the cold affects needs a plan from their own doctor; Minneapolis asks families for a medical provider's note¹². Local NWS offices also set their own cold advisory levels, so an advisory in your area may start at a different number¹.

The district rules here are examples, not a survey. Policies change, so check your own school's current text. For the other weather calls, see heat and burn risk for summer and the lightning rule for storms. For why time outside is worth protecting in winter at all, see how much outdoor play children need.