Species · Iowa · BBS 2025 Release · 1966–2024
Scarlet Tanager Population Trend in Iowa
Scarlet Tanager in Iowa has edged up: up 17% on the route-weighted index since 1976.
+17%Since 1976
20Routes In State
38Years
Notable Scarlet Tanager Trends in Iowa
No notable trend signals for Scarlet Tanager in Iowa. See the full index history below.
Scarlet Tanager Population Forecast in Iowa
If the recent trend holds, Scarlet Tanager in Iowa is projected to stay roughly flat through 2029, near 0.10 (95% range 0.00–0.22). A 5-year backtest shows a typical error of ±36.9%, with 80% of held-out values landing inside the 95% band.
+7%Change by 2029
0.10Projected 2029 index
0.00–0.2295% range
±36.9%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.10 | 0.00 | 0.22 |
| 2026 | 0.10 | 0.00 | 0.22 |
| 2027 | 0.10 | 0.00 | 0.22 |
| 2028 | 0.10 | 0.00 | 0.22 |
| 2029 | 0.10 | 0.00 | 0.22 |
Scarlet Tanager Survey Routes in Iowa
| Mt Hamill | 1 | 2024 | 1976 |
| Exline | 1 | 2018 | 1990 |
| Bedford | 1 | 2012 | 1979 |
| West Liberty | 1 | 2018 | 2014 |
| Brooklyn | 1 | 2022 | 1987 |
| Williamsburg | 1 | 2017 | 1967 |
| Red Rock | 1 | 2022 | 1988 |
| Panther | 1 | 2001 | 2001 |
| Washington | 1 | 2021 | 2021 |
| Wales | 1 | 2002 | 1972 |
| Maquoketa | 1 | 2024 | 1977 |
| Alice | 1 | 1978 | 1978 |
| Dinsdale | 1 | 1990 | 1990 |
| Clare | 1 | 2000 | 2000 |
| Washta | 1 | 2010 | 1982 |
| Sioux City | 1 | 1985 | 1985 |
| Festina | 1 | 2014 | 1979 |
| Davis Corner | 1 | 2023 | 1988 |
| Tipton | 1 | 2015 | 2000 |
| Lafayette | 1 | 2013 | 2013 |
Scarlet Tanager Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.