When to Come Spring and fall are the best times to mountain bike Moab. May. Weather is changeable then, with storms and wind popping up quickly. Flash floods are possible. If you're caught out in a thunderstorm, move off the ridges and domes where lightning might strike. Autumn, from mid-September to early November, offers delightful weather.
Occasional storms roll through, but most days are calm and clear.
Treat the land with respect Be respectful of the land. Don't touch or rub petroglyphs or pictographs even small amounts of sweat and body oil can degrade these treasures. Stay on trails or slickrock when riding in canyon country so you won't destroy the cryptobiotic soil common to the region. It looks like nubby black crust, and is actually a living community of lichens, mosses, fungi, and bacteria that help hold the desert soil in place. Once destroyed, this fragile crust takes years to grow back.