 Yosemite Valley is open all year , although some roads within the park close in winter . Downhill skiing is available at the Badger Pass Ski Area — the oldest downhill skiing area in California , offering downhill skiing from mid @-@ December through early April . Much of the park is open to cross @-@ country skiing and snowshoeing , with several backcountry ski huts open for use . Wilderness permits are required for backcountry overnight ski trips . 
