Parks by Month

Longest daylight, wildflowers out, and the best odds of the mountain being visible before summer cloud sets in.

Continuous daylight and the passes melted out enough to walk, with mosquitoes building.

Longest days and peak wolf and moose activity, with blackflies at their worst.

Exit Glacier fully accessible and the light running past eleven at night.

Continuous daylight over the Great Kobuk Sand Dunes and the river is high enough to land on.

Bears grazing sedge on the coast with newborn cubs, under the longest light of the year.

Full road access, snowmelt creeks running through the Giant Forest, and comfortable temperatures at altitude.

Prairie at its greenest, bison calves on the surface, and the full cave tour schedule running.

Long daylight for flightseeing and the Root Glacier ice is clean before summer melt-out dirties it.

Lupine on the roadsides and the longest days of the year for the carriage roads.

Full road access on both rims and long days for the East Portal descent to the river.

Snowmelt fills the Snake, valley wildflowers start, and Teton Park Road is fully open.

Lehman Caves without a queue before the summer road-trippers arrive.

Synchronous fireflies at Elkmont — lottery access only, and one of the strangest natural events in the system.

Rainforest fully saturated and the crowds have not arrived, though Hurricane Ridge may still be snowbound.

Trail Ridge opens and alpine wildflowers begin, while the lower trails are already snow-free.

Wild horses with foals, prairie fully green, and long northern daylight at both ends of the day.

A park made mostly of water, so the question is not what the weather is but what state the water is in — liquid, frozen, or the useless weeks in between.

Long days, bison and bighorn active, and the Notch Trail ladder is the thing kids remember.

Medano Creek at peak — a shallow sand beach at 8,000 feet, and the best natural playground in the system.

Waterfalls at peak snowmelt, bison calves everywhere, and every road finally open at once.

Tuolumne and Tioga come online while the valley still has water in the falls — the widest access of the year.

Lower valleys and Many Glacier are excellent, but the alpine road may still be closed for the first three weeks.

A bear-viewing park with two peaks in the same season: the July salmon run at the falls, and the September fattening before the bears den.

Full ranger tour schedule — the ladders and hand-and-toe holds are the entire point, especially with kids.

A hydrothermal park at high elevation with one of the shortest usable seasons in the lower 48 — the main highway is frequently snowbound into July.

The most alpine park in the lower 48 and the least developed, with one highway through it that closes for half the year and almost no services inside the boundary.