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

Cliff Swallow Population Trend in Maryland

All statesAerial insectivores

Cliff Swallow in Maryland has increased: up 32% on the route-weighted index since 1969.

+32%Since 1969
20Routes In State
56Years

Notable Cliff Swallow Trends in Maryland

No notable trend signals for Cliff Swallow in Maryland. See the full index history below.

Cliff Swallow Population Forecast in Maryland

If the recent trend holds, Cliff Swallow in Maryland is projected to rise about 144% by 2029 — from 0.21 in 2024 to a central estimate of 0.52 (95% range 0.17–0.88). A 5-year backtest shows a typical error of ±172.6%, with 40% of held-out values landing inside the 95% band.

+144%Change by 2029
0.52Projected 2029 index
0.17–0.8895% range
±172.6%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
20250.490.140.85
20260.500.140.86
20270.510.150.87
20280.520.160.87
20290.520.170.88

Cliff Swallow Survey Routes in Maryland

Routes recording Cliff Swallow in Maryland.
Jennings820241997
Eklo620171969
Mt Nebo419911970
Potomac Park320211973
Beltsville320101983
Floyd220211966
Vindex220171967
Bachman Mill219751975
Pomfret220002000
Williamsport120222008
Olney120141991
Pleasant Val119661966
Fowblesburg120041983
Steyer120191996
Finzel120241997
Accident 2120212021
Accident120101995
Wheaton120142014
Ijamsville120192011
Davidsnville119951995

Cliff Swallow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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