GREAT AMERICAN VACATION
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Spring and early summer are most bustling. Folks clear out in the midsummer heat, and then return for the apple harvest and crisp temperatures of autumn. Still, the park is seldom crowded—though the campground can fill quickly. Annual rainfall is scant, but when it does rain, flash floods can wipe out park roads. Snowfall is usually light. Sudden, short-lived snowstorms—and thunderstorms—are not uncommon in the spring.