August: 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.
Permits and reservations
No timed-entry reservation is needed anywhere in the park in 2026. Check trail and road closures first, because wildfires have closed parts of the northeast side.
Climbing permit: A climbing permit is required for travel above 10,000 feet or on glaciers.
Wilderness permit (Wonderland Trail & backcountry camping): A permit is required year-round for every overnight stay in the backcountry, and is not needed for day hiking. Peak-season (June–Sept) advance reservations are on Recreation.gov.