The first ascent of Pilot Peak was on August 12, 1932, by Hollis Mees and Robert McKenzie. They amazingly did the climb without climbing gear. It’s now known as a difficult climb because of the loose rock. You can see footage of Mees and McKenzie’s ascent in this video:
By the way, we have been collecting some interesting Yellowstone videos, mostly of geysers, on our YouTube channel here:
https://www.youtube.com/channel/UCF0XW_RT5rtr4vJ3MVoaDoQ/feed
–Beth Chapple, Editor