The small Canadian population of Rock Wren is not well monitored. The Breeding Bird Survey (BBS) is the only available source of long-term monitoring data, but because there are relatively few observations of the species in any region, the estimated trend for Canada relies heavily on the average trend across the BBS survey area, including the United States, and its reliability specific to the Canadian population is considered low. It shows a distinct increase from the early 1970s to mid-1980s, followed by roughly decadal fluctuations peaking around 1995, 2005, and 2015, but with an overall declining trend, resulting in current levels 33% below 1970.

The goal for Rock Wren is to increase the population to the level it was at in the early 1970s, based on the Breeding Bird Survey. Trend data show that Rock Wren is currently below its goal range and continuing to decline. Despite this, analysis of recent trends and potential growth rates suggests that Rock Wren could reach its population goal by 2050, but only if timely conservation action is taken.