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

Tree Swallow Population Trend in Wyoming

All statesAerial insectivores

Tree Swallow in Wyoming has risen sharply: up 71% on the route-weighted index since 1970.

+71%Since 1970
91Routes In State
56Years

Notable Tree Swallow Trends in Wyoming

long arc increasecomputed index

Tree Swallow has risen sharply in Wyoming: up 71% on the route-weighted index since 1970.

Tree Swallow Population Forecast in Wyoming

If the recent trend holds, Tree Swallow in Wyoming is projected to rise about 23% by 2029 — from 2.4 in 2024 to a central estimate of 3.0 (95% range 0.04–5.9). A 5-year backtest shows a typical error of ±19.3%, with 100% of held-out values landing inside the 95% band.

+23%Change by 2029
3.0Projected 2029 index
0.04–5.995% range
±19.3%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
20253.00.035.9
20263.00.035.9
20273.00.035.9
20283.00.045.9
20293.00.045.9

Tree Swallow Survey Routes in Wyoming

Routes recording Tree Swallow in Wyoming.
Green River6719841977
Cody3220241989
Arvada2220221987
Meeteetse2020241991
Seedskadee1920231986
Boulder1820241999
Seedskadee 21820242024
Hayden Val1619861985
Savery1419951989
Mammoth1420241982
Crazy Woman1220241979
Ryan Park1120231993
Harmony1120231982
Walcott1020241985
Alpine920241979
Otto820151970
Dayton820241983
Yellowstone820221987
Dubois620241968
Wilson620241979
Mtn View620241980
Hunter Peak520241982
Horse Creek520241983
Cheyenne520162001
Ne Entrance420211982

Tree Swallow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsin

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