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

Blackburnian Warbler Population Trend in Maryland

All statesForest birds

Blackburnian Warbler in Maryland has surged: up 198% on the route-weighted index since 1968.

+198%Since 1968
6Routes In State
53Years

Notable Blackburnian Warbler Trends in Maryland

long arc increasecomputed index

Blackburnian Warbler has surged in Maryland: up 198% on the route-weighted index since 1968.

Blackburnian Warbler Population Forecast in Maryland

If the recent trend holds, Blackburnian Warbler in Maryland is projected to fall about 22% by 2029 — from 0.17 in 2024 to a central estimate of 0.13 (95% range 0.04–0.22). A 5-year backtest shows a typical error of ±36.8%, with 80% of held-out values landing inside the 95% band.

-22%Change by 2029
0.13Projected 2029 index
0.04–0.2295% range
±36.8%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
20250.120.040.21
20260.130.040.21
20270.130.040.21
20280.130.040.22
20290.130.040.22

Blackburnian Warbler Survey Routes in Maryland

Routes recording Blackburnian Warbler in Maryland.
Finzel520242000
Jennings220241997
Floyd120151966
Vindex120181966
Upper Xrds119711971
Steyer120072007

Blackburnian Warbler Population Trend in Other States

connecticutgeorgiaindianamainemassachusettsmichiganminnesotanew-hampshirenew-jerseynew-yorknorth-carolinaohiopennsylvaniarhode-islandtennesseevermontvirginiawest-virginiawisconsin

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