Global Short Term Trend: Decline of 10-30%
Comments: Breeding Bird Survey data indicate an ongoing decline over the past 10 years or three generations.
Global Long Term Trend: Unknown
Comments: Trend over the past 200 years is unknown, but this species appears to have undergone a decline over the past several decades. Breeding Bird Survey (BBS) data for 1966-2007 indicate a significant survey-wide decline averaging 2.3% per year; this amounts to a 61% decline over this time period. BBS abundance (average number of individuals per route) declined from 1.6-2.1 in the 1960s and early 1970s to 0.9-1.2 in 2000-2007 (decline of around one individual per route), so the absolute magnitude of the decline is relatively modest.
BBS data for 1966-2003 indicate that areas of population decline are extensive in British Columbia, U.S. Pacific coast states,Southern Rockies, south-central Canada, and portions of northern New England and adjacent Canada, whereas population increases occurred in interior western North America and portions of the area extending from the northern Great Lakes region to Newfoundland.