Joshua Tree National Park in October

October through April offers the most comfortable weather, with daytime temperatures in the 70s and cool nights perfect for camping. This is peak season, so expect crowds at popular spots like Skull Rock and Cholla Cactus Garden. December and January bring the coolest temperatures — sometimes dipping below freezing at night — but also the clearest skies for stargazing. March and April showcase wildflower blooms if winter rains were adequate. The desert comes alive with color, though bloom timing varies year to year. May through September means extreme heat, with summer temperatures regularly exceeding 100°F. But here's the thing — summer has advantages. Fewer crowds, lower accommodation prices, and if you can handle the heat, incredible sunrises and sunsets. Just start hiking before dawn and retreat to shade by 10 AM. Winter nights can drop to 20°F, so check weather forecasts and pack accordingly.