The best time to visit a national park

There's no universal best month, but the patterns by park type are reliable enough to plan on.

Desert parks want you from October through April. Summer in the desert parks isn't a crowding problem, it's a safety problem, with triple-digit heat by mid-morning. Winter is the insider season, with cold clear mornings, empty trails, and long light. Spring splits the difference and brings the biggest crowds of the year with the wildflowers.

Mountain parks run on snow, not on your calendar. High-country roads hold snow into June and many close entirely from October to May, so "the park is open" and "the road you came for is open" are different claims; check the alerts on the park's page here before believing either. Mid-June through September is the honest window. If you hate crowds, go in September alone, when roads are open, school is back in session, and the aspens are turning.

Coastal parks and lakeshores peak in a civilized way. Late May, June, and September give you open facilities without the July parking wars. Water's warmest in early fall, which surprises people.

Historic sites are the year-round answer. Compact, often indoors, lightly visited even in peak season, and at their best in exactly the months the nature parks are at their worst. They're what February is for.

And in any month, at any famous park: arrive before 9 a.m. or after 3 p.m. Crowding is a daily cycle more than a seasonal one. The park is almost never full. The parking lot is.