Two subspecies of Brewer's Sparrow are recognized in Canada: "Timberline Sparrow" in the subalpine shrublands of the Rocky Mountains in northern British Columbia, Alberta, and southern Yukon, and the more widespread "sagebrush" subspecies in the sage-dominated grasslands of southern British Columbia, Alberta, and Saskatchewan. Both subspecies winter in the southwestern United States and Mexico. Altogether there are approximately 150,000 individuals in Canada, representing less than 1% of the global population and a very low degree of responsibility for Canada, but Canada likely has a high or even very high proportion of the Timberline population. The sagebrush population is only moderately sampled by the Breeding Bird Survey, while the Timberline population is barely monitored at all by current programs. Available data for the species as a whole show little change in abundance relative to 1970, but confidence is medium at best. Overall, the national population of Brewer's Sparrow is within its goal range, although at its lowest point since 1970 and at risk of dropping below its goal range within the next few years if current trends continue.