Jesus Malverde wrote:Longlost,
Roper's The Climber's Guide to the High Sierra (1976 edition) has this on page 124:"The first recorded climbing in the region was in 1860, when Tom Clark probably reached the summit of Mt. Tom.."
That's interesting, because in the 2nd (1997) edition of "Sierra High Route" (p. 47) Roper says:
"In late June  the three men [Whitney, Brewer, Hoffman] climbed northward out of the [Yosemite] valley toward little-known territory. On June 24 they ascended a prominent peak that was quickly named Mount Hoffman in honor of the group's cartographer. This straightforward climb marked the first verified ascent of a major High Sierra peak and symbolizeed [sic] the beginning of an era that present-day mountaineers can only envy. A few days later, from their camp near Tuolumne Meadows, Brewer and Hoffman climbed a massive peak on the main Sierra crest. So impressed were they with the view that Brewer persuaded Whitney to climb it with him the following day. According to Brewer's journal, Whitney 'thought the view the grandest he had ever beheld, although he has seen nearly the whole of Europe".
Secor (1st ed) confirms the 1863 date of Hoffman but wrongly gives 1864 for Dana. I'm interested in this because I think have indisputable evidence that the second recorded peak ascent was actually in 1855, and as far as I can tell, nobody is aware of it--I've been scouring the literature and have found no mention of it anywhere.