| Climber Name | # Ascents Recorded | Notes |
|---|---|---|
| Jenn DeBellis | 1 | |
| Jenny Lavarda | 1 | |
| Jenya Kazbekova | 1 | |
| Jeremy Fullerton | 1 | |
| Jeremy Smith | 1 | |
| Jérôme Jean-Charles | 1 | Bleausard bouldering pioneer. Chipped and climbed the first 7B in the forest Le Carnage in 1977.
In the 1980s, he climbed the entire Cuvier white circuit wearing trainers. References[1] Godoffe, J. 'Blocs en Stock: Le Cuvier', 1993 |
| Jessica Mccaskey | 1 | |
| Jessie Wence | 1 | Very strong female boulderer from the South East of the US. Climbs mainly in NC and on the moonboard. Currently has climbed up to 8A boulders. |
| J. F. Hamilton | 1 | |
| Jim Burton | 1 | |
| Jim Campbell | 1 | |
| Jim Herson | 1 | |
| Jim Madsen | 1 | Yosemite climber of the 1960s. Died attempting to rescue Chuck Pratt and Chris Fredricks from the Dihedral Wall during a storm. The first fatal accident of a climber in Yosemite References[1] https://publications.americanalpineclub.org/articles/12196949602/James-Thomas-Madsen-1947-1968 [2] https://publications.americanalpineclub.org/articles/13196901702 |
| Jim Merli | 1 | |
| Jim Perrin | 1 | Jim Perrin is a well established author of climbing related works. As well as publishing many books he has also written extensively on climbing for mainstream news sources such as The Guardian newspaper. |
| Jim Petersen | 1 | |
| Jim Sandford | 1 | References[1] Free Will: The Climbing Life of Jim Sandford by David Smart, Gripped 2021 https://gripped.com/profiles/free-will-the-climbing-life-of-jim-sandford/ |
| Jindrich Sustr | 1 | |
| Jo Allen | 1 | |
| Jochen Perschmann | 1 |