Foliage hotspots
Great Smoky Mountains, Shenandoah, Acadia, and Rocky Mountain put on strong fall color, generally peaking across October by elevation. Those weekends are the busiest non-summer dates of the year.
Crisp desert and canyon weather
Utah's parks and the Grand Canyon cool into comfortable hiking weather in fall, with thinner crowds than spring.
Watch for early closures
High alpine roads can close as early as October with snow. Confirm road status if your plan depends on a seasonal route.
