Tioga Road closes due to snow, usually from sometime in November through late May or early June.
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A: Tioga Road, Glacier Point Road, and the Mariposa Grove Road close seasonally in the winter to vehicular traffic. Tioga Road is closed just past the entrance to the Tuolumne Grove (the trees are accessible year-round) all the way to the Tioga park entrance on the other side.
Stay on trails to protect growing plants and plan for wet feet. Marked trails may be hard or impossible to follow; hikers should have GPS, as well as map and compass (and know how to use them). Tioga Road is typically open to vehicles from late May or June until sometime in November.
There are so many incredible hiking trails along Tioga Road that offer spectacular views. Hiking in Yosemite's “high country” is perfect for the day-hiker who wants to escape the crowds of the Yosemite Valley and enjoy the serene beauty of the Yosemite Wilderness and breathe in the fresh alpine air.
Most of the trails in Yosemite Valley that don't lead up the valley walls are open year round. Bridalveil Fall, Lower Yosemite Falls, Mirror Lake, and the Vernal-Fall-footbridge section of the Mist Trail are all hikable, except after unusually heavy snowfalls.
Chains are often required on roads both inside and outside of Yosemite from November through March, less often in October and April, and rarely in September or May.