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

Canada Goose Population Trend in New Hampshire

All statesWaterfowl

Canada Goose in New Hampshire has surged: up 11× on the route-weighted index since 1980.

11×Since 1980TrendPercent 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 →
25Routes 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 →
40YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Canada Goose 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 →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Canada Goose has surged in New Hampshire: up 11× on the route-weighted index since 1980.

Canada Goose Population Forecast in New Hampshire

If the recent trend holds, Canada Goose in New Hampshire is projected to stay roughly flat through 2029, near 3.7 (95% range 0.61–6.8). A 5-year backtest shows a typical error of ±6.9%, with 100% of held-out values landing inside the 95% band.

+4%Change by 2029TrendPercent 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 →
3.7Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.61–6.895% 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 →
±6.9%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, Canada Goose in New Hampshire is projected to stay roughly flat through 2029, near 3.7 (95% range 0.61–6.8). A 5-year backtest shows a typical error of ±6.9%, with 100% of held-out values landing inside the 95% band.19742029
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 →
20253.40.376.5
20263.50.436.6
20273.60.496.6
20283.60.556.7
20293.70.616.8

Canada Goose Survey Routes in New Hampshire

Routes recording Canada Goose 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 →
Strafford3120232000
Glen3020221992
Milan2420241982
Dixvil Notch2320161999
Mt Chocorua1920242002
Stratford1920221990
Fitzwilliam1420231989
Jefferson Hl1420242000
Clarksville1220242007
Jeffers Ntch1120172011
Dover420231996
Epsom420181992
Gilmantn I W420192009
Wilmot420231993
Lempster420241984
Brentwood219971980
Concord220081974
Walpole220241992
Dixville Notch 2220242021
Peterborough120231986
Hopkinton120172017
Canterbury120241993
Marlow120221982
Franconia120141975
East Kingston120151999

Canada Goose Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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