Palm Warbler
Palm Warbler has surged: up 125% on the route-weighted index since 1969.
About the Palm Warbler
The Palm Warbler (Setophaga palmarum) is a North American member of the Wood-Warblers (Parulidae). In this analysis it is grouped with the forest birds.
- Size
- 4.5–5.5 in long (11–14 cm) — a small, active songbird (typical for the family)
- Habitat
- Woodlands and forest edges, including wooded suburbs and parks.
- Diet
- Insects and spiders gleaned from foliage and bark, with seeds and berries in season.
- Range
- Recorded on 83 Breeding Bird Survey routes across 5 states, most concentrated in the Boreal Hardwood Transition.
- Family
- Parulidae · Forest birds
Notable Palm Warbler Trends
No notable trend signals for Palm Warbler. See the full index history below.
Palm Warbler Population Forecast
If the recent trend holds, Palm Warbler is projected to stay roughly flat through 2029, near 0.01 (95% range 0.01–0.02). A 5-year backtest shows a typical error of ±131%, with 40% of held-out values landing inside the 95% band.
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.01 | 0.00 | 0.02 |
| 2026 | 0.01 | 0.01 | 0.02 |
| 2027 | 0.01 | 0.01 | 0.02 |
| 2028 | 0.01 | 0.01 | 0.02 |
| 2029 | 0.01 | 0.01 | 0.02 |
Where the Palm Warbler Is Detected
BBS routes recording Palm Warbler, sized by most recent count.
Palm Warbler Population Trend by State
| Maine | +16% | 1977 | 31 |
| Michigan | +123% | 1992 | 15 |
| Minnesota | +71% | 1971 | 20 |
| New York | insufficient data | n/a | 3 |
| Wisconsin | -32% | 1971 | 14 |
Palm Warbler Population Trend by Region
Bird Conservation Regions are the ecological unit for trends.
| Boreal Hardwood Transition | +123% | 1969 | 48 |
| Atlantic Northern Forest | +68% | 1977 | 33 |
Palm Warbler Conservation Status
Our route-weighted index shows it up about 125% since 1969.
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. Trend is a route-weighted relative-abundance index, not an absolute population.