Bardini Foundation
Rock climbing, ski and mountaineering instruction and guiding, and avalanche courses. Operates in the Eastern Sierra Nevada range. (Bishop, California)
Earthworks
Guide service based in Santa Barbara and leads trips to southern California and the southern and eastern Sierra Nevada.
Joshua Tree Rock Climbing School
Rock climbing instruction. Operates in Joshua Tree National Park. (Joshua Tree, California)
Nidever Mountain Guides
Guided rock and ice climbing, ski trips, and wilderness adventures. (June Lake, California)
Shasta Mountain Guides
Guided mountaineering adventures and instruction, women's trips, rock climbing, backcountry skiing and boarding on Mount Shasta. (Mount Shasta, California)
Sierra Mountain Center
Rock climbing and mountaineering instruction and guiding. Operates in the Eastern Sierra Nevada range. (Bishop, California)
Sierra Rock Climbing School
Rock climbing instruction and guiding in the Mammoth Lakes and Bishop areas of the Eastern Sierra. (Bishop, California)
Yosemite Mountaineering School
Climbing school and guide service in Yosemite offering all levels of instruction and private guiding. (Fresno, California)