Species · Colorado · BBS 2025 Release · 1966–2024
Yellow-billed Cuckoo Population Trend in Colorado
Yellow-billed Cuckoo in Colorado has collapsed: down 77% on the route-weighted index since 1981.
-77%Since 1981
14Routes In State
19Years
Notable Yellow-billed Cuckoo Trends in Colorado
long arc declinecomputed index
Yellow-billed Cuckoo has collapsed in Colorado: down 77% on the route-weighted index since 1981.
Yellow-billed Cuckoo Population Forecast in Colorado
If the recent trend holds, Yellow-billed Cuckoo in Colorado is projected to stay roughly flat through 2028, near 0.00 (95% range 0.00–0.16). A 5-year backtest shows a typical error of ±241.8%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2028
0.00Projected 2028 index
0.00–0.1695% range
±241.8%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2024 | 0.00 | 0.00 | 0.16 |
| 2025 | 0.00 | 0.00 | 0.16 |
| 2026 | 0.00 | 0.00 | 0.16 |
| 2027 | 0.00 | 0.00 | 0.16 |
| 2028 | 0.00 | 0.00 | 0.16 |
Yellow-billed Cuckoo Survey Routes in Colorado
| Lamar | 6 | 1985 | 1985 |
| Wildhorse L | 5 | 2012 | 1990 |
| Doyle Bridge 2 | 4 | 2001 | 1998 |
| Doyle Bridge | 2 | 1997 | 1996 |
| Great Divide | 1 | 1983 | 1983 |
| Ninaview | 1 | 2001 | 1995 |
| Harmony | 1 | 2013 | 1980 |
| Pinneo | 1 | 1988 | 1981 |
| Gordon Creek | 1 | 1998 | 1998 |
| Abarr | 1 | 1998 | 1985 |
| Fort Morgan | 1 | 2013 | 1999 |
| Trinchera | 1 | 1996 | 1990 |
| Two Buttes | 1 | 1982 | 1973 |
| Neegrande | 1 | 2023 | 2023 |
Yellow-billed Cuckoo Population Trend in Other States
alabamaarizonaarkansascaliforniaconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.