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

Violet-green Swallow In Shortgrass Prairie

All regionsShortgrass PrairieAerial insectivores

Violet-green Swallow in Shortgrass Prairie has surged: up 176% on the route-weighted index since 1993.

+176%Since 1993
16Routes In Region
31Years

Notable Signals

long arc increasecomputed index

Violet-green Swallow has surged in Shortgrass Prairie: up 176% on the route-weighted index since 1993.

Forecast

If the recent trend holds, Violet-green Swallow in Shortgrass Prairie is projected to fall about 100% by 2029 — from 0.29 in 2024 to a central estimate of 0.00 (95% range 0.00–1.3). A 5-year backtest shows a typical error of ±235.7%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–1.395% range
±235.7%Backtest error
19762029
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
20250.030.001.3
20260.020.001.3
20270.010.001.3
20280.000.001.3
20290.000.001.3

Routes In Shortgrass Prairie

Routes recording Violet-green Swallow in Shortgrass Prairie.
MaxwellNEW-MEXICO2931997
ElbertCOLORADO142024
Pine RidgeNEBRASKA92024
Pine BluffWYOMING42022
NinaviewCOLORADO22004
Wagon MoundNEW-MEXICO21976
KiowaCOLORADO12016
TrincheraCOLORADO12014
VillegreenCOLORADO12007
Kiowa 2COLORADO12024
TimpasCOLORADO11998
Murray LakeNEBRASKA12017
CrawfordNEBRASKA12016
VariaderoNEW-MEXICO12018
SabinosoNEW-MEXICO12016
ChugwaterWYOMING12022

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