BirdAnalyst
Species · BCR 18 · BBS 2025 Release · 1966–2024

Chestnut-collared Longspur In Shortgrass Prairie

All regionsShortgrass PrairieGeneralists

Chestnut-collared Longspur in Shortgrass Prairie has collapsed: down 92% on the route-weighted index since 1969.

-92%Since 1969
16Routes In Region
57Years

Notable Signals

long arc declinecomputed index

Chestnut-collared Longspur has collapsed in Shortgrass Prairie: down 92% on the route-weighted index since 1969.

Forecast

If the recent trend holds, Chestnut-collared Longspur in Shortgrass Prairie is projected to fall about 100% by 2029 — from 0.34 in 2024 to a central estimate of 0.00 (95% range 0.00–0.84). A 5-year backtest shows a typical error of ±238.2%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–0.8495% range
±238.2%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
20250.000.000.84
20260.000.000.84
20270.000.000.84
20280.000.000.84
20290.000.000.84

Routes In Shortgrass Prairie

Routes recording Chestnut-collared Longspur in Shortgrass Prairie.
CheyenneWYOMING212024
AgateNEBRASKA122001
PinneoCOLORADO62016
NunnCOLORADO62021
BriggsdaleCOLORADO52008
KimballNEBRASKA52021
Adams Co.COLORADO32016
Gordon CreekCOLORADO32005
LimonCOLORADO32024
RockportCOLORADO32024
BoyeroCOLORADO11995
GilpinCOLORADO12017
Cone MtnCOLORADO11992
GroverCOLORADO12024
PritchettCOLORADO12019
Agate 2NEBRASKA12023

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