To increase your chances of getting a reservation, make your request as early as possible and be flexible on dates and campsites. Weekends and holidays in the spring and fall are busiest. If possible, plan your trip to start Sunday through Wednesday. When requesting campsites, consider traveling east to west. Weather May and April are pleasant months in the desert.
Strong winds are common and it is the beginning of the gnat season.
November through March is very unpredictable with equal chances clear skies or snow storms. Sections of road on shaded hillsides often remain icy for months. Carrying two pairs of chains and traveling in groups of two vehicles is recommended in winter. Bicyclists should have a patch kit, pump, spare tube, tools, water bottles, helmet, gloves, and should be in good physical condition. Bring and drink a minimum of one gallon of water per person per day.