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

Northern Bobwhite Population Trend in Colorado

All statesGrassland birds

Northern Bobwhite in Colorado has fallen sharply: down 75% on the route-weighted index since 1970.

-75%Since 1970
27Routes In State
55Years

Notable Northern Bobwhite Trends in Colorado

long arc declinecomputed index

Northern Bobwhite has fallen sharply in Colorado: down 75% on the route-weighted index since 1970.

Northern Bobwhite Population Forecast in Colorado

If the recent trend holds, Northern Bobwhite in Colorado is projected to fall about 100% by 2029 — from 0.15 in 2024 to a central estimate of 0.00 (95% range 0.00–0.80). A 5-year backtest shows a typical error of ±88.9%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–0.8095% range
±88.9%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
20250.010.000.81
20260.000.000.80
20270.000.000.80
20280.000.000.80
20290.000.000.80

Northern Bobwhite Survey Routes in Colorado

Routes recording Northern Bobwhite in Colorado.
Doyle Bridge1219971992
Fort Morgan520241996
Arsenal319911991
Rush320042004
Neegrande320242023
Edler320241993
Last Chance219741974
Boyero219931990
Doyle Bridge 2220161998
Waverly220191989
Nunn220172017
Julesburg220172004
Pritchett220241999
Stoneham220192001
Pinneo120121976
Fleming120121973
Abarr120191968
Lamar120241973
Two Buttes120091973
Hudson120171989
Gordon Creek120192019
Crowley120171990
Cheyenne120082008
Campo120192016
Burlington120242018

Northern Bobwhite Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawashingtonwest-virginiawisconsinwyoming

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