Bighorn sheep split into two distinct herds in New Mexico: Rocky Mountain bighorns hold on in the state’s northern high country, while desert bighorns persist in isolated southern ranges. Rio Grande del Norte National Monument and the Sangre de Cristo Mountains anchor the northern population, with Carson National Forest’s canyon country filling the gap between them.
Despite a G4 global rank, NatureServe lists the species as critically imperiled (S1) within New Mexico, a sign of just how small and scattered these mountain herds are compared to bighorn populations elsewhere in the West.
Records rise through early summer and peak in July, likely because that’s when hikers and researchers are most active in the steep, broken terrain bighorns favor. With just over 1,000 records logged since 2000, confirmed sightings stay scarce relative to how much rugged ground the two subspecies cover.
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