Tennessee Warbler
Tennessee Warbler has surged: up 76% on the route-weighted index since 1968.
About the Tennessee Warbler
The Tennessee Warbler (Leiothlypis peregrina) 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 175 Breeding Bird Survey routes across 10 states, most concentrated in the Atlantic Northern Forest.
- Family
- Parulidae · Forest birds
Notable Tennessee Warbler Trends
No notable trend signals for Tennessee Warbler. See the full index history below.
Tennessee Warbler Population Forecast
If the recent trend holds, Tennessee Warbler is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.03). A 5-year backtest shows a typical error of ±57.5%, with 100% of held-out values landing inside the 95% band.
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.01 | 0.00 | 0.03 |
| 2026 | 0.01 | 0.00 | 0.03 |
| 2027 | 0.01 | 0.00 | 0.03 |
| 2028 | 0.01 | 0.00 | 0.03 |
| 2029 | 0.01 | 0.00 | 0.03 |
Where the Tennessee Warbler Is Detected
BBS routes recording Tennessee Warbler, sized by most recent count.
Tennessee Warbler Population Trend by State
| Alaska | -90% | 1995 | 16 |
| Maine | -87% | 1971 | 60 |
| Michigan | -38% | 1971 | 26 |
| Minnesota | +18% | 1971 | 30 |
| Montana | +12% | 1988 | 6 |
| New Hampshire | -9% | 1968 | 10 |
| New York | +135% | 1976 | 10 |
| Pennsylvania | insufficient data | n/a | 1 |
| Vermont | insufficient data | n/a | 5 |
| Wisconsin | -25% | 1984 | 11 |
Tennessee Warbler Population Trend by Region
Bird Conservation Regions are the ecological unit for trends.
| BCR 4 | -80% | 1995 | 11 |
| Northern Rockies | +20% | 1988 | 6 |
| Boreal Hardwood Transition | +163% | 1970 | 62 |
| Atlantic Northern Forest | -63% | 1968 | 84 |
| Prairie Hardwood Transition | -44% | 1996 | 5 |
Tennessee Warbler Conservation Status
Our route-weighted index shows it up about 76% since 1968.
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. Trend is a route-weighted relative-abundance index, not an absolute population.