Quercus gambellii (Gamble Oak)

From “Native Plants for Birds” handout: Grows 10-30ft, prefers full sun and low water. Blooms in late Spring with showy Fall foliage.
Host Plant for the state insect, the Colorado hairstreak butterfly Also good for: Shelter, seed, insects, and nesting. Feeds: Warblers, vireos, towhees, buntings, grosbeaks.