BirdAnalyst
Species · BCR 30 · BBS 2025 Release · 1966–2024

Least Bittern In New England / Mid-Atlantic Coast

All regionsNew England / Mid-Atlantic CoastWetland birds

Least Bittern in New England / Mid-Atlantic Coast has surged: up 165% on the route-weighted index since 1969.

+165%Since 1969
11Routes In Region
49Years

Notable Signals

long arc increasecomputed index

Least Bittern has surged in New England / Mid-Atlantic Coast: up 165% on the route-weighted index since 1969.

Forecast

If the recent trend holds, Least Bittern in New England / Mid-Atlantic Coast is projected to stay roughly flat through 2029, near 0.05 (95% range 0.00–0.10). A 5-year backtest shows a typical error of ±22.7%, with 100% of held-out values landing inside the 95% band.

-8%Change by 2029
0.05Projected 2029 index
0.00–0.1095% range
±22.7%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
20250.050.000.10
20260.050.000.10
20270.050.000.10
20280.050.000.10
20290.050.000.10

Routes In New England / Mid-Atlantic Coast

Routes recording Least Bittern in New England / Mid-Atlantic Coast.
DanburyCONNECTICUT21976
BlackbirdDELAWARE22021
MadisonMARYLAND22024
WarrenCONNECTICUT11988
HarringtonDELAWARE12003
Golden HillMARYLAND11969
HongaMARYLAND12024
CokesburyMARYLAND12022
DoverNEW-HAMPSHIRE11973
East KingstonNEW-HAMPSHIRE12017
FriendshipNEW-JERSEY12024

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