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From the 1950s to the 1970s, Hidden Valley was among the most famous places in the world to ski. But in 1991, the National Park Service finished dismantling the mini-resort, letting the area revert back, mostly, to what it was prior to 1950. And what it was continues to dazzle skiers today. Follow the old skin track as it climbs 2,000 feet, above treeline, to a wide-open and wind-swept area with easy access and terrain challenges suited to intermediate skiers. Derelict ski trails offer wide open tree skiing that feels like having a resort to your lonesome. Better yet: Slopes angled 30 degrees or less dominate the area, leading to a lower risk for avalanches. Season December to May