11,100 ft.
Also saw these guys around Red Peak Pass earlier in the year. Took the time to get some click-clicks of them this time.
It never ceases to amaze me the amount of life above 10,000 ft. - ish.
Learned that the pronunciation is PIKE-A not PEEK-A (I still prefer the later).
And they are a cousin of the rabbit.

Yeah yeah, you can get this info from wikipedia. Complain and I'll put up a picture of chick-on on top of Virginia or Stanton Peak!