While Joshua Tree National Park is open all year round, the best time to visit the park is in autumn (March to May) and spring (September to November) when the weather is favorable and the skies are relatively clear. During these months, the average temperature is 84°F, and while that's still on the warmer side, it's not as bad as the 99°F temperatures in summer.
Due to summer's sizzling temperatures, a summer trip is not recommended unless you have sufficient experience in similar conditions, as it can become quite dangerous if you're not well equipped to deal with the heat.
Seasons in Joshua Tree National Park
Best for: long hikes, camping and the Night Sky Festival
Fall is one of the best seasons to visit Joshua Tree National Park, with perfect conditions for most of September, October and November.
Due to optimal temperatures of around 82°F, the park can get quite busy, so chances are you'll have to share popular hiking tracks such as the Barker Dam Trail and the Maze Loop with plenty of fellow outdoor lovers.
The Night Sky Festival also happens every October and is well worth attending if stargazing is your thing, with photography classes, art workshops and astronomy presentations on offer.