BirdAnalyst
Species · BCR 17 · BBS 2025 Release · 1966–2024

Tree Swallow In Badlands and Prairies

All regionsBadlands and PrairiesAerial insectivores

Tree Swallow in Badlands and Prairies has surged: up 875% on the route-weighted index since 1971.

+875%Since 1971
101Routes In Region
55Years

Notable Signals

long arc increasecomputed index

Tree Swallow has surged in Badlands and Prairies: up 875% on the route-weighted index since 1971.

Forecast

If the recent trend holds, Tree Swallow in Badlands and Prairies is projected to rise about 109% by 2029 — from 1.1 in 2024 to a central estimate of 2.4 (95% range 0.50–4.3). A 5-year backtest shows a typical error of ±49.1%, with 100% of held-out values landing inside the 95% band.

+109%Change by 2029
2.4Projected 2029 index
0.50–4.395% range
±49.1%Backtest error
19692029
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
20252.20.344.1
20262.30.384.2
20272.30.424.2
20282.30.464.2
20292.40.504.3

Routes In Badlands and Prairies

Routes recording Tree Swallow in Badlands and Prairies.
IsabelSOUTH-DAKOTA882015
St XavierMONTANA452010
PromiseSOUTH-DAKOTA452015
ArvadaWYOMING222022
Two DotMONTANA212024
RochfordSOUTH-DAKOTA152018
RosebudSOUTH-DAKOTA132011
BadlandsSOUTH-DAKOTA132012
Black FoxSOUTH-DAKOTA112017
GorhamNORTH-DAKOTA102018
Reed PointMONTANA92024
BentleyNORTH-DAKOTA82018
DaytonWYOMING82024
St Xavier 2MONTANA72023
Ft ThompsonSOUTH-DAKOTA72007
Maynard CouleeMONTANA62024
CircleMONTANA52023
BrandenbergMONTANA52019
VolunteerSOUTH-DAKOTA52017
Cedar PassSOUTH-DAKOTA52016
LacreekSOUTH-DAKOTA52023
FlatwillowMONTANA41992
WebsterMONTANA42023
Chuffey SpringMONTANA42023
TobaccoNORTH-DAKOTA42019

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