Species · Arizona · BBS 2025 Release · 1966–2024
Bell's Vireo Population Trend in Arizona
Bell's Vireo in Arizona has increased: up 35% on the route-weighted index since 1970.
+35%Since 1970
43Routes In State
56Years
Notable Bell's Vireo Trends in Arizona
No notable trend signals for Bell's Vireo in Arizona. See the full index history below.
Bell's Vireo Population Forecast in Arizona
If the recent trend holds, Bell's Vireo in Arizona is projected to stay roughly flat through 2029, near 4.0 (95% range 2.1–5.9). A 5-year backtest shows a typical error of ±36.6%, with 100% of held-out values landing inside the 95% band.
-3%Change by 2029
4.0Projected 2029 index
2.1–5.995% range
±36.6%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 3.9 | 1.9 | 5.8 |
| 2026 | 3.9 | 2.0 | 5.8 |
| 2027 | 3.9 | 2.0 | 5.9 |
| 2028 | 4.0 | 2.0 | 5.9 |
| 2029 | 4.0 | 2.1 | 5.9 |
Bell's Vireo Survey Routes in Arizona
| Pomerene | 91 | 2024 | 1968 |
| Amado | 22 | 2023 | 1993 |
| Cutter 2 | 17 | 2018 | 2015 |
| Carr Mtn | 17 | 2024 | 1985 |
| Redington | 14 | 2023 | 1993 |
| Cutter | 13 | 2014 | 1992 |
| Pisinimo | 10 | 1993 | 1992 |
| Sunizona | 8 | 1997 | 1970 |
| Bartlett Res | 7 | 2024 | 1993 |
| Peña Blanca | 6 | 2024 | 1975 |
| Patagonia | 6 | 2024 | 1969 |
| Sahuarita | 4 | 2024 | 1992 |
| Ajo | 3 | 2001 | 1968 |
| Skull Valley | 3 | 2024 | 2001 |
| Red Rock | 3 | 2014 | 1995 |
| Peach Spring | 3 | 2024 | 2005 |
| Casa Grande | 3 | 2023 | 1989 |
| Ajo 2 | 3 | 2017 | 2011 |
| Florence | 2 | 1988 | 1971 |
| San Simon | 2 | 2024 | 2023 |
| Red Rock 2 | 2 | 2024 | 2015 |
| Mcneal | 2 | 2024 | 1992 |
| Organ Pipe | 1 | 2021 | 1991 |
| The Gap | 1 | 1973 | 1968 |
| Dragoon | 1 | 2001 | 1993 |
Bell's Vireo Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.