Adventuresport Guides
- Rock climbing instruction and guiding. (San Diego, California)
- http://www.adventuresportguides.com/

Yosemite Mountaineering School
- Climbing school and guide service in Yosemite offering all levels of instruction and private guiding. (Fresno, California)
- http://www.yosemiteparktours.com/summer/activities_rock_climbing.htm

Vertical Adventures Rock Climbing School
- Rock climbing instruction and guiding in Joshua Tree National Park. (Newport Beach, California)
- http://www.vertical-adventures.com/

Sierra Rock Climbing School
- Rock climbing instruction and guiding in the Mammoth Lakes and Bishop areas of the Eastern Sierra. (Bishop, California)
- http://www.sierrarockclimbingschool.com

Sierra Mountain Center
- Rock climbing and mountaineering instruction and guiding. Operates in the Eastern Sierra Nevada range. (Bishop, California)
- http://www.sierramountaincenter.com

Shasta Mountain Guides
- Guided mountaineering adventures and instruction, women's trips, rock climbing, backcountry skiing and boarding on Mount Shasta. (Mount Shasta, California)
- http://www.shastaguides.com

Nidever Mountain Guides
- Guided rock and ice climbing, ski trips, and wilderness adventures. (June Lake, California)
- http://www.themountainguide.com/

Mountain Adventure Seminars
- Offering rock and ice climbing and mountaineering trips throughout California and Nevada. (Bear Valley, California)
- http://www.mtadventure.com/

Joshua Tree Rock Climbing School
- Rock climbing instruction. Operates in Joshua Tree National Park. (Joshua Tree, California)
- http://www.joshuatreerockclimbing.com

Get Lost Adventures
- Offering rock climbing instruction as well as guided backpacking trips and teambuilding facilitation. (Marina Del Rey, California)
- http://www.getlostadventures.com

Earthworks
- Guide service based in Santa Barbara and leads trips to southern California and the southern and eastern Sierra Nevada.
- http://www.earthworksclimbing.com

Bardini Foundation
- Rock climbing, ski and mountaineering instruction and guiding, and avalanche courses. Operates in the Eastern Sierra Nevada range. (Bishop, California)
- http://www.bardini.org