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

Northern Harrier Population Trend in Utah

All statesGeneralists

Northern Harrier in Utah has declined: down 30% on the route-weighted index since 1970.

-30%Since 1970
82Routes In State
54Years

Notable Northern Harrier Trends in Utah

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

Northern Harrier Population Forecast in Utah

If the recent trend holds, Northern Harrier in Utah is projected to fall about 27% by 2029 — from 0.56 in 2024 to a central estimate of 0.41 (95% range 0.00–1.4). A 5-year backtest shows a typical error of ±21.2%, with 100% of held-out values landing inside the 95% band.

-27%Change by 2029
0.41Projected 2029 index
0.00–1.495% range
±21.2%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
20250.450.001.4
20260.440.001.4
20270.430.001.4
20280.420.001.4
20290.410.001.4

Northern Harrier Survey Routes in Utah

Routes recording Northern Harrier in Utah.
Snowville1420241999
Promontory920241969
E. Bear Lake620211996
Johnson Can420241987
Goose Creek Mtn.420092005
Neponset Res420181995
Timpie Spg320031978
Hill Creek319951994
Peplin Mountain320231999
Gilson Butte 2320112006
Woodruff320122009
Wellington 3220222019
Wendover220111969
Goshen220231968
Hanksville219951992
Lynn220231982
Wah Wah220191999
Callao220211992
Gilson Butte220001993
Grantsville220212001
Jericho Junction220222006
Pine Creek220232001
Canyon Rims220242013
Newcastle220062006
Monticello220182000

Northern Harrier Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradodelawaregeorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasvermontvirginiawashingtonwest-virginiawisconsinwyoming

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