BirdAnalyst
Species · Wyoming · BBS 2025 Release · 1966–2024

Northern Harrier Population Trend in Wyoming

All statesGeneralists

Northern Harrier in Wyoming has edged down: down 19% on the route-weighted index since 1970.

-19%Since 1970
113Routes In State
56Years

Notable Northern Harrier Trends in Wyoming

No notable trend signals for Northern Harrier in Wyoming. See the full index history below.

Northern Harrier Population Forecast in Wyoming

If the recent trend holds, Northern Harrier in Wyoming is projected to fall about 25% by 2029 — from 0.45 in 2024 to a central estimate of 0.34 (95% range 0.00–0.77). A 5-year backtest shows a typical error of ±17.5%, with 100% of held-out values landing inside the 95% band.

-25%Change by 2029
0.34Projected 2029 index
0.00–0.7795% range
±17.5%Backtest error
19682029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.360.000.79
20260.350.000.78
20270.350.000.78
20280.340.000.77
20290.340.000.77

Northern Harrier Survey Routes in Wyoming

Routes recording Northern Harrier in Wyoming.
Sussex420161992
Daniel419881980
Shawnee420031991
Reliance420011977
Gvnt Valley420192000
Patrick Draw319781973
Frannie320241999
Farson320241995
Green River319841977
Clarkelen219781968
Natrona219921968
Brookhurst220061968
Savery219891989
Dayton220241981
Schoonover220231989
Arvada220081982
Gebo220241992
Highlight219821982
Raven220241992
Bairoil220221988
Meadowdale219921992
Lingle220241989
Elk Horn 2220242022
Welch220181978
Flamin Gorge220171988

Northern Harrier Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradodelawaregeorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsin

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