Few California mammals map the state’s desert mountains as cleanly as the bighorn sheep. Its 5,346 records concentrate overwhelmingly in the southeast: Riverside County alone accounts for 2,819 and San Diego County for 1,245, and the Santa Rosa and San Jacinto National Monument holds 1,511 records, the richest single site in the state.
Built for steep, bare rock
Bighorns live and die by escape terrain. Rubber-soled, split hooves carry them across cliffs and talus that coyotes and mountain lions cannot follow, so they favor broken ranges where open rock sits close to grazing slopes. California’s record follows that logic through Joshua Tree National Park, Death Valley National Park, San Gabriel Mountains National Monument, Mojave National Preserve, and Mojave Trails National Monument, a chain of dry ranges rising off the desert floor.
Two herds, one hard summer
California holds two distinct bighorn populations. Desert bighorns occupy the arid southeastern ranges and the Peninsular Ranges, while the endangered Sierra Nevada bighorn survives only along the high eastern Sierra, where the John Muir Wilderness and Mono, Inyo, and Tulare counties anchor its records. The calendar leans heavily toward February and March, when desert sheep range low and green forage follows winter rain, and sags in July and August, when extreme heat keeps sheep close to the few canyons that still hold water.
Status in California
NatureServe has not assigned the bighorn a California rank (SNR), though the species is G4 globally. It is native to the state and not listed as nonindigenous by USGS NAS. The Sierra Nevada population stands apart as an endangered subspecies confined to the eastern Sierra.
Full species profile
