February: This is peak climbing and bouldering season, with sunny 60-degree days among the monzogranite piles. In wet winters, low-elevation wildflowers start near Cottonwood toward month's end.
March: Wildflowers move upslope from the Colorado Desert into the Mojave, and Joshua trees themselves may bloom in a good year. Comfortable hiking in the 70s.
November: Climbing season is back, with warm days in the 60s–70s, cool nights and excellent stargazing.
Permits and reservations
No advance reservations are needed to enter.
Campgrounds: Most campgrounds require reservations on Recreation.gov. First-come sites fill fast on weekends, holidays and in spring.
Backcountry permit: A permit is required for all overnight stays in the backcountry. It costs $6 and covers 1 to 12 people for up to 14 nights, and can be bought on Recreation.gov, by phone, or at the permit office in Twentynine Palms.
Keys Ranch tour: Reservations required on Recreation.gov.