BirdAnalyst
Species · South Dakota · BBS 2025 Release · 1966–2024

Chestnut-collared Longspur Population Trend in South Dakota

All statesGeneralists

Chestnut-collared Longspur in South Dakota has collapsed: down 77% on the route-weighted index since 1969.

-77%Since 1969
43Routes In State
57Years

Notable Chestnut-collared Longspur Trends in South Dakota

long arc declinecomputed index

Chestnut-collared Longspur has collapsed in South Dakota: down 77% on the route-weighted index since 1969.

Chestnut-collared Longspur Population Forecast in South Dakota

If the recent trend holds, Chestnut-collared Longspur in South Dakota is projected to fall about 100% by 2029 — from 6.5 in 2024 to a central estimate of 0.00 (95% range 0.00–15). A 5-year backtest shows a typical error of ±326.9%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–1595% range
±326.9%Backtest error
19672029
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
20250.000.0015
20260.000.0015
20270.000.0015
20280.000.0015
20290.000.0015

Chestnut-collared Longspur Survey Routes in South Dakota

Routes recording Chestnut-collared Longspur in South Dakota.
Lodgepole9420241990
Reva4020241979
Conde1419841967
Forbes1120121967
Crow Creek1020231967
Long Lake920191967
Maurine820241968
Chamberlain720101967
Ft Thompson620111967
Gorman520101979
Harding420141967
Lacreek420141995
Britton319851973
Ottumwa320181967
Cedar Pass319841969
Pioneer220121997
Rosebud220101967
Raymond219851967
Lane219781967
Wilmot219701970
Veblen219781969
Promise220091986
Volunteer220031967
Isabel220151990
S. Pioneer220221994

Chestnut-collared Longspur Population Trend in Other States

coloradominnesotamontananebraskanorth-dakotawyoming

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