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

Barn Swallow Population Trend in Delaware

All statesAerial insectivores

Barn Swallow in Delaware has surged: up 96% on the route-weighted index since 1968.

+96%Since 1968
17Routes In State
58Years

Notable Barn Swallow Trends in Delaware

long arc increasecomputed index

Barn Swallow has surged in Delaware: up 96% on the route-weighted index since 1968.

Barn Swallow Population Forecast in Delaware

If the recent trend holds, Barn Swallow in Delaware is projected to fall about 12% by 2029 — from 37 in 2024 to a central estimate of 33 (95% range 23–42). A 5-year backtest shows a typical error of ±18.2%, with 100% of held-out values landing inside the 95% band.

-12%Change by 2029
33Projected 2029 index
23–4295% range
±18.2%Backtest error
19662029
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
2025322241
2026322241
2027322342
2028322342
2029332342

Barn Swallow Survey Routes in Delaware

Routes recording Barn Swallow in Delaware.
Harrington6220241966
Bethany Bch4419901966
Blackbird4420241994
Frederica4320141966
Dover3819871966
Frankford3720121966
Millsboro3220242017
Holleyville 23120242006
Holleyville2720041966
Milton2620161966
Milton 21920172017
Lowes Xrds1619911966
Pepperbox 21620242017
Mt Pleasant1520191966
Pepperbox1220161998
Georgetown1120221992
Wilmington320141966

Barn Swallow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutfloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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