- J -
- Mt. Jackson
- June 17-19, 2000 - Laurie Martin and George Kasynski
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- Jacque Peak - 13,205'
- February 13, 1999 - Theron Welch
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- Jagged Mountain - 13,824'
- September 4-6, 1999 - Los Alamos Mountaineers Club
- July 29-Aug 4, 2000 - Doug Cook, Bob Reimann
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- James Peak - 13,294'
- July 21, 1996 - Steve Fry
- September 12, 1998 - Steve Fry
- June 19, 1999 - Dawn DuPriest
- February 26, 2000 - Gary Swing
- June 11, 2000 - Doug Cook
- July 14, 2000 - Doug Cookl
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- Jasper Lake
- August 16, 1997 - Steve Fry
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- Jasper Peak 12,293' -
- June 8, 1997 - Jack Dennis - CMC
- June 10, 2000 - Theron Welch
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- Jones Mountain - 13,830' -
- May 29-30, 1998 - Los Alamos Mountaineers Club
- July 29-Aug 4, 2000 - Doug Cook, Bob Reimann
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- Jupiter Mountain -
