BirdAnalyst
Species · BCR 16 · BBS 2025 Release · 1966–2024

Northern Harrier In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauGeneralists

Northern Harrier in Southern Rockies / Colorado Plateau has fallen sharply: down 58% on the route-weighted index since 1970.

-58%Since 1970
88Routes In Region
52Years

Notable Signals

long arc declinecomputed index

Northern Harrier has fallen sharply in Southern Rockies / Colorado Plateau: down 58% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Northern Harrier in Southern Rockies / Colorado Plateau is projected to stay roughly flat through 2029, near 0.06 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±44.7%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029
0.06Projected 2029 index
0.00–0.1495% range
±44.7%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
20250.060.000.14
20260.060.000.14
20270.060.000.14
20280.060.000.14
20290.060.000.14

Routes In Southern Rockies / Colorado Plateau

Routes recording Northern Harrier in Southern Rockies / Colorado Plateau.
ToroweapARIZONA62006
MoscaCOLORADO32005
Hill CreekUTAH31995
Gilson Butte 2UTAH32011
Douglas PassCOLORADO22023
MoffatCOLORADO22015
Pleasant ViewCOLORADO22021
San LuisCOLORADO22009
MesitaCOLORADO22008
HanksvilleUTAH21995
Gilson ButteUTAH22000
Canyon RimsUTAH22024
MonticelloUTAH22018
Wellington 3UTAH22022
Lost Cr. ResUTAH22012
BrookhurstWYOMING22006
House RockARIZONA12013
OraibiARIZONA12022
KaibitoARIZONA12009
YampaCOLORADO12015
BufordCOLORADO12016
ParlinCOLORADO12007
DoloresCOLORADO11987
FalfaCOLORADO12007
BlancaCOLORADO11981

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