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

Northern Harrier Population Trend in Missouri

All statesGeneralists

Northern Harrier in Missouri has fallen sharply: down 69% on the route-weighted index since 1973.

-69%Since 1973
17Routes In State
26Years

Notable Northern Harrier Trends in Missouri

long arc declinecomputed index

Northern Harrier has fallen sharply in Missouri: down 69% on the route-weighted index since 1973.

Northern Harrier Population Forecast in Missouri

If the recent trend holds, Northern Harrier in Missouri is projected to stay roughly flat through 2029, near 0.03 (95% range 0.00–0.08). A 5-year backtest shows a typical error of ±200%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029
0.03Projected 2029 index
0.00–0.0895% range
±200%Backtest error
19672029
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
20250.030.000.08
20260.030.000.08
20270.030.000.08
20280.030.000.08
20290.030.000.08

Northern Harrier Survey Routes in Missouri

Routes recording Northern Harrier in Missouri.
Trenton220051993
Norborne220122006
Centerville219981998
Frazier120051994
Millwood120172017
Sticklervill120112011
Laclede120051996
Kirksville120132006
Sedalia120242012
Cascade119671967
Kahoka2120022002
Reeds120041974
Cole Camp119731971
Ohio119981974
Sni Mills119801980
Madison120042004
Bland120002000

Northern Harrier Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradodelawaregeorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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