Species · Oklahoma · BBS 2025 Release · 1966–2024

Northern Harrier Population Trend in Oklahoma

All states Generalists

Northern Harrier in Oklahoma has collapsed: down 94% on the route-weighted index since 1969.

-94%Since 1969

36Routes In State

46Years

Notable Northern Harrier Trends in Oklahoma

long arc declinecomputed index

Northern Harrier has collapsed in Oklahoma: down 94% on the route-weighted index since 1969.

Northern Harrier Population Forecast in Oklahoma

If the recent trend holds, Northern Harrier in Oklahoma is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.33). A 5-year backtest shows a typical error of ±300.1%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029

0.00Projected 2029 index

0.00–0.3395% range

±300.1%Backtest error

Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.

Year	Projected index	95% low	95% high
2025	0.00	0.00	0.33
2026	0.00	0.00	0.33
2027	0.00	0.00	0.33
2028	0.00	0.00	0.33
2029	0.00	0.00	0.33

Northern Harrier Survey Routes in Oklahoma

Routes recording Northern Harrier in Oklahoma.

Arapaho	4	1992	1992
Rosston	3	1967	1967
Ft Sill East	2	1994	1994
Beggs	2	2012	1967
Eagle City	2	1995	1971
Douglas	2	2013	1968
Beaver	2	2013	2007
Woodward	2	2008	2008
Hooker	2	2017	1993
Keyes	2	2017	1993
Duncan	2	2006	1994
Phillips	1	1973	1973
Mill Creek	1	1969	1969
Loco	1	1976	1969
Randlett	1	1974	1967
Cookietown	1	1968	1968
Reed	1	1998	1998
Indianola	1	1982	1967
Noble	1	1975	1975
Verden	1	1970	1970
Grimes	1	1994	1967
Erick	1	1985	1969
Peoria	1	1984	1969
Welch	1	2024	1967
Collinsville	1	1993	1967

Northern Harrier Population Trend in Other States

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