American Pikas are a small heat-sensitive lagomorph that in many locations across the west have shown recent extirpation, apparently due to warming climates. Research in the northern Sierra’s has shown local extirpations, but no comprehensive region-wide surveys exist. We mapped all talus within our 150 x 60-km study area, then visited 1,100 talus patches across 85 population units to assess which factors best predict patch occupancy. We found 46% of populations have gone extinct in the northern Sierra’s, nearly all of which showed previous signs of occupancy. Evidence from resurveys and carbon dating of scat indicates that extinction dates span at least the last 75 years, including multiple extinctions in the last decade. Populations with less talus habitat and high summer vapor pressure deficit were more likely to go extinct. Similarly, talus patches with more talus area and later snow melt were more likely to persist. Of 120 talus patches revisited from the last 10-15 years, only 11 changed status, with 6 going extinct. Our research suggests, contrary to some recent commentary, that pika in our study area are in fact not re-occupying long extirpated warm locations, and have been pushed up almost 1000 ft in elevation over the last century in the northern Sierra’s.