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

Bobolink Population Trend in Maryland

All statesGrassland birds

Bobolink in Maryland has surged: up 509% on the route-weighted index since 1970.

+509%Since 1970
16Routes In State
56Years

Notable Bobolink Trends in Maryland

long arc increasecomputed index

Bobolink has surged in Maryland: up 509% on the route-weighted index since 1970.

Bobolink Population Forecast in Maryland

If the recent trend holds, Bobolink in Maryland is projected to rise about 64% by 2029 — from 0.57 in 2024 to a central estimate of 0.93 (95% range 0.47–1.4). A 5-year backtest shows a typical error of ±41.2%, with 100% of held-out values landing inside the 95% band.

+64%Change by 2029
0.93Projected 2029 index
0.47–1.495% range
±41.2%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
20250.890.431.4
20260.900.441.4
20270.910.451.4
20280.920.461.4
20290.930.471.4

Bobolink Survey Routes in Maryland

Routes recording Bobolink in Maryland.
Floyd720241970
Emmitsburg720241977
Finzel620241995
Mt Nebo519911969
Accident520171992
Steyer420231996
Smithsburg320141978
Ijamsville320021987
Vindex220231968
Accident 2220242018
Jennings220241995
Elkton119781978
Williamsport120212021
Wolfsville120192005
Fair Hill119961993
Warfieldsbrg120161974

Bobolink Population Trend in Other States

californiacoloradoconnecticutidahoillinoisindianaiowakansaskentuckymainemassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotautahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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