BirdAnalyst
Species · BCR 12 · BBS 2025 Release · 1966–2024

Forster's Tern In Boreal Hardwood Transition

All regionsBoreal Hardwood TransitionWetland birds

Forster's Tern in Boreal Hardwood Transition has declined: down 37% on the route-weighted index since 1982.

-37%Since 1982
8Routes In Region
20Years

Notable Signals

No notable trend signals for Forster's Tern in Boreal Hardwood Transition. See the full index history below.

Forecast

If the recent trend holds, Forster's Tern in Boreal Hardwood Transition is projected to stay roughly flat through 2024, near 0.18 (95% range 0.00–0.44). A 5-year backtest shows a typical error of ±997%, with 80% of held-out values landing inside the 95% band.

n/aChange by 2024
0.18Projected 2024 index
0.00–0.4495% range
±997%Backtest error
19742024
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
20200.170.000.43
20210.170.000.43
20220.170.000.44
20230.180.000.44
20240.180.000.44

Routes In Boreal Hardwood Transition

Routes recording Forster's Tern in Boreal Hardwood Transition.
BagleyMINNESOTA202006
Washington IWISCONSIN31974
Rib LakeWISCONSIN22008
LudeMINNESOTA11984
GreenbushMINNESOTA11993
NebishMINNESOTA11992
Tamarac NwrMINNESOTA12019
BayfieldWISCONSIN12008

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