ASI was established in 1979 by Bela G. Vadasz and Mimi Maki-Vadasz. We are America's original all-terrain backcountry ski mountaineering, avalanche education and climbing program based in the Sierra Nevada, visiting the greatest ranges of the world. With experiences among the highest mountains in over 15 different countries, ASI's instructors and AMGA and IFMGA certified guides bring a wealth of experience to help coach and lead you to the greatest adventures of your lifetime.

Spring - Enjoy high route ski traverses and ski mountaineering to destinations including Mt. Shasta, The Sierra High Route, the Alpine Col Tour and the Evolution Loop, European Haute Route and ski descents of Mt. Tom, Mt. Whitney, the Palisades and much more.

Summer - Offering rock climbing courses at Donner Pass and guided rock climbs at Lover's Leap, climbs of Mt. Shasta and many High Sierra peaks, including North Palisade, Bear Creek Spire, The East Face, East Buttress and the Mountaineer's Route on Mt. Whitney.

Fall - We guide great Sierra ice climbs such as Mt. Dana, the Dana Couloir, the U-notch and the V-notch on North Palisade and Mt. Sill. We visit many of the great ranges of the world including Mexico's Volcanoes, Mt. Blanc, the Matterhorn and the Himalaya.

Winter - We specialize in AIARE Level 1, 2 & 3 Avalanche Courses, Backcountry Skiing, including telemark, randonnée, as well as backcountry snowboarding and winter mountaineering in the immediate Truckee/Lake Tahoe area along with ice climbing in the famous Lee Vining Canyon.