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Species · New Hampshire · BBS 2025 Release · 1966–2024

Tennessee Warbler Population Trend in New Hampshire

All statesForest birds

Tennessee Warbler in New Hampshire has held roughly steady: down 9% on the route-weighted index since 1968.

-9%Since 1968TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
10Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
23YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Tennessee Warbler Trends in New HampshireNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Tennessee Warbler in New Hampshire. See the full index history below.

Tennessee Warbler Population Forecast in New Hampshire

If the recent trend holds, Tennessee Warbler in New Hampshire is projected to stay roughly flat through 2027, near 0.06 (95% range 0.00–0.13). A 5-year backtest shows a typical error of ±54.1%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2027TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
0.06Projected 2027 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1395% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±54.1%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Tennessee Warbler in New Hampshire is projected to stay roughly flat through 2027, near 0.06 (95% range 0.00–0.13). A 5-year backtest shows a typical error of ±54.1%, with 100% of held-out values landing inside the 95% band.19662027
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20230.060.000.13
20240.060.000.13
20250.060.000.13
20260.060.000.13
20270.060.000.13

Tennessee Warbler Survey Routes in New Hampshire

Routes recording Tennessee Warbler in New Hampshire.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Milan220191999
Glen219941981
Canterbury119941994
Gilmantn I W119941994
Mt Chocorua119781973
Franconia119861966
Stratford119911991
Dixvil Notch120001967
Clarksville120002000
Dixville Notch 2120222022

Tennessee Warbler Population Trend in Other States

alaskamainemichiganminnesotamontananew-yorkpennsylvaniavermontwisconsin

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.