Species · Colorado · BBS 2025 Release · 1966–2024
Chimney Swift Population Trend in Colorado
Chimney Swift in Colorado has collapsed: down 82% on the route-weighted index since 1970.
-82%Since 1970
8Routes In State
51Years
Notable Chimney Swift Trends in Colorado
long arc declinecomputed index
Chimney Swift has collapsed in Colorado: down 82% on the route-weighted index since 1970.
Chimney Swift Population Forecast in Colorado
If the recent trend holds, Chimney Swift in Colorado is projected to stay roughly flat through 2028, near 0.00 (95% range 0.00–0.17). A 5-year backtest shows a typical error of ±108.7%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2028
0.00Projected 2028 index
0.00–0.1795% range
±108.7%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2024 | 0.00 | 0.00 | 0.17 |
| 2025 | 0.00 | 0.00 | 0.17 |
| 2026 | 0.00 | 0.00 | 0.17 |
| 2027 | 0.00 | 0.00 | 0.17 |
| 2028 | 0.00 | 0.00 | 0.17 |
Chimney Swift Survey Routes in Colorado
| Burlington | 6 | 2014 | 2004 |
| Fleming | 3 | 2023 | 1968 |
| Amherst | 2 | 2021 | 1993 |
| Julesburg | 2 | 2019 | 1998 |
| Waverly | 1 | 2018 | 2015 |
| Fort Morgan | 1 | 2023 | 1998 |
| Flagler | 1 | 2021 | 1997 |
| Ellicott | 1 | 2010 | 2010 |
Chimney Swift Population Trend in Other States
alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.