Date: 12/4/25 3:48 pm From: Bill Schmoker <bill.schmoker...> Subject: 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...> 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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