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

Lark Sparrow Population Trend in Colorado

All statesGrassland birds

Lark Sparrow in Colorado has surged: up 207% on the route-weighted index since 1970.

+207%Since 1970
130Routes In State
56Years

Notable Lark Sparrow Trends in Colorado

long arc increasecomputed index

Lark Sparrow has surged in Colorado: up 207% on the route-weighted index since 1970.

Lark Sparrow Population Forecast in Colorado

If the recent trend holds, Lark Sparrow in Colorado is projected to stay roughly flat through 2029, near 6.1 (95% range 2.4–9.7). A 5-year backtest shows a typical error of ±10.9%, with 100% of held-out values landing inside the 95% band.

+5%Change by 2029
6.1Projected 2029 index
2.4–9.795% range
±10.9%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
20255.92.29.6
20265.92.39.6
20276.02.39.7
20286.02.39.7
20296.12.49.7

Lark Sparrow Survey Routes in Colorado

Routes recording Lark Sparrow in Colorado.
Trinchera16920221990
Mica Butte7419871968
Ninaview5520241994
Walsenburg5220241994
Cone Mtn4520241988
Doyle Bridge3619971992
Baxter Pass3420241994
Pinneo3320191974
Douglas Pass3120241982
Crowley3120241989
Kirk3120231992
Boyero2920171979
Bethune2820191989
Angora2520241998
Villegreen2420241988
Arsenal 22220242016
De Beque1720241992
Mosca1620171995
Cokedale1620241995
Kiowa 21520242019
Browns Park1520241992
Sheridan Lak1420131995
Yampa1320231995
Falfa1320241971
Hudson1220241988

Lark Sparrow Population Trend in Other States

alabamaarizonaarkansascaliforniaidahoillinoisindianaiowakansaskentuckylouisianaminnesotamississippimissourimontananebraskanevadanew-mexiconorth-dakotaohiooklahomaoregonsouth-dakotatennesseetexasutahwashingtonwisconsinwyoming

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