Re: [cobirds] Bushtit Range Expansion

OK, that got me curious as to what the long-running Boulder CBC data could show so I went back to its start in 1910.  While early counts definitely had more patchy effort, and the count didn't run for many of the early years (no counts in the national database 1912-1919, 1923-1925, 1927-1944, and 1946-1949), Boulder has run every year since 1950 so that's a fun well of data to draw from.

Boulder CBC's first Bushtits were recorded on the 1968 count (18), then again only in these years until 2004:

1973 (4)

1974 (20)

1975 (6)

1978 (17)

1981 (4)

1983 (18)

2000 (14)

Since 2004 we've recorded them annually (details addressed in my previous post.)

In conclusion I'd say that at least in Boulder in the winter Bushtits were absent or quite unusual until after the turn of the millennium, kind of rare through the early 2000s, then growing more abundant and expected especially in the past decade or so.

-Bill Schmoker, Longmont

On Thu, Dec 4, 2025 at 2:25 PM Virginia Holman <virginiaholmanwrites@gmail.com> wrote:

Hi,

Are there any studies/reports re: the Bushtit range expansion in Colorado in the last 10-15 years? 

I'm coming across significant anecdotal information from longtime birders in the region, but nothing formal/science-based yet.

Thanks for any guidance.

Virginia Holman

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