August is high-country month: subalpine meadows peak, the Sierra backcountry is snow-free, and Alaska's glaciers are at their most accessible.
Paradise and Sunrise are at peak wildflower bloom from late July through mid-August, with lupine, paintbrush and avalanche lilies beneath the glaciers. No timed entry in 2026.
Hikes to do: Skyline Trail, Naches Peak Loop, Burroughs Mountain, Tolmie Peak
Don't miss: Paradise meadows, Sunrise, the highest point reachable by car, Reflection Lakes
Tip: Parking at Paradise and Sunrise fills by mid-morning on summer weekends.
The high trails finally melt out, turquoise lakes glow with glacial flour, and the park stays among the least crowded in the Lower 48.
Hikes to do: Cascade Pass, Diablo Lake Trail, Thunder Knob, Hidden Lake Lookout
Don't miss: Diablo Lake Overlook, Cascade Pass, Ross Lake
Tip: Cascade Pass Road is gravel and parking is limited. Arrive early.
The deepest canyon in the Sierra is at its best when Cedar Grove is open and the high country is snow-free, from the Rae Lakes Loop to Mist Falls.
Hikes to do: Mist Falls, Zumwalt Meadow, General Grant Loop, Rae Lakes Loop
Don't miss: Kings Canyon Scenic Byway, Zumwalt Meadow, General Grant Tree
Tip: Wilderness permits are required overnight and quota trails fill. See Permits & reservations.
The largest national park in the country is most accessible now: the McCarthy Road is passable, Kennecott mill tours run, and you can walk out onto the Root Glacier.
Hikes to do: Root Glacier Trail, Bonanza Mine, Nugget Creek
Don't miss: Kennecott Mines National Historic Landmark, Root Glacier, Nabesna Road wilderness
Tip: The McCarthy Road is 60 miles of gravel. Check the live alerts for road conditions.
Wheeler Peak's summit trail is snow-free, the 4,000-year-old bristlecone pines are reachable, and August's dark, moonless skies are among the best in the country.
Hikes to do: Bristlecone Pine Trail, Alpine Lakes Loop, Wheeler Peak Summit
Don't miss: Wheeler Peak Scenic Drive, Bristlecone grove, Lehman Caves tour
Tip: Lehman Caves tours release 30 days ahead and sell out. See Permits & reservations.
Warm water, calm lakes and the Perseid meteor shower (mid-August) in a certified dark-sky park. It's the best month to paddle and camp on the islands.
Hikes to do: Echo Bay Trail, Blind Ash Bay, Oberholtzer Trail, Locator Lake
Don't miss: Kettle Falls Hotel, Rainy Lake by boat, Night skies over Kabetogama
Tip: Most campsites are boat-in only. Boat tour tickets release every April 15.
All of the high trails are open, Many Glacier's lakes are warmest, and huckleberries ripen (bears love them too).
Hikes to do: Grinnell Glacier, Iceberg Lake, Highline Trail, Siyeh Pass
Don't miss: Many Glacier, Two Medicine, Logan Pass
Tip: Wildfire smoke can affect views in August. Check the live alerts and air quality.