The Breeding Bird Survey (BBS), which covers a large portion of the breeding population in Canada, provides the best available information on long-term population trends of the Lark Sparrow. BBS results show a large increase in abundance since 1970 within both Bird Conservation Regions that host the species, and for which there are reasonably reliable results (displayed below). In contrast, BBS results for North America, which mostly reflect the larger population in the United States, indicate that the continental Lark Sparrow population has decreased by about 25% since 1970. The Lark Sparrow population is at an acceptable level relative to its national population goal (see Canada graph below).
Additional information on: Breeding Bird Survey (BBS) - Canadian analysis