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

Common Loon Population Trend in Vermont

All statesWetland birds

Common Loon in Vermont has surged: up 316% on the route-weighted index since 1978.

+316%Since 1978
10Routes In State
30Years

Notable Common Loon Trends in Vermont

long arc increasecomputed index

Common Loon has surged in Vermont: up 316% on the route-weighted index since 1978.

Common Loon Population Forecast in Vermont

If the recent trend holds, Common Loon in Vermont is projected to fall about 33% by 2029 — from 0.28 in 2024 to a central estimate of 0.18 (95% range 0.07–0.30). A 5-year backtest shows a typical error of ±38.8%, with 60% of held-out values landing inside the 95% band.

-33%Change by 2029
0.18Projected 2029 index
0.07–0.3095% range
±38.8%Backtest error
19672029
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
20250.170.060.29
20260.180.060.29
20270.180.070.29
20280.180.070.30
20290.180.070.30

Common Loon Survey Routes in Vermont

Routes recording Common Loon in Vermont.
St Johnsbury220231990
Hardwick220241998
Stratton120102006
Post Mills120241978
Middlesex120232019
East Calais120222018
Greensboro120241967
Fletcher120232023
Newbury 2120222022
Grand Isle120241969

Common Loon Population Trend in Other States

alaskaidahomainemassachusettsmichiganminnesotamontananew-hampshirenew-yorknorth-dakotaoregonwashingtonwisconsinwyoming

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