 Rock climbing is an important part of Yosemite . Camp 4 , a walk @-@ in campground in Yosemite Valley , was instrumental in the development of rock climbing as a sport , and is listed on the National Register of Historic Places . Climbers can generally be spotted in the snow @-@ free months on anything from ten @-@ foot @-@ high ( 3 m ) boulders to the 3 @,@ 300 @-@ foot ( 1 @.@ 0 km ) face of El Capitan . Classes are offered by numerous groups on rock climbing . 
