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

Pine Siskin Population Trend in California

All statesGeneralists

Pine Siskin in California has declined: down 42% on the route-weighted index since 1970.

-42%Since 1970
120Routes In State
56Years

Notable Pine Siskin Trends in California

No notable trend signals for Pine Siskin in California. See the full index history below.

Pine Siskin Population Forecast in California

If the recent trend holds, Pine Siskin in California is projected to stay roughly flat through 2029, near 0.57 (95% range 0.00–1.6). A 5-year backtest shows a typical error of ±37.5%, with 100% of held-out values landing inside the 95% band.

+3%Change by 2029
0.57Projected 2029 index
0.00–1.695% range
±37.5%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
20250.650.001.7
20260.630.001.7
20270.610.001.6
20280.590.001.6
20290.570.001.6

Pine Siskin Survey Routes in California

Routes recording Pine Siskin in California.
Colma3819721968
Point Reyes3120231971
Big Bear2519811969
Macdoel1920111974
Honeydew1620171968
Fairfax1620241972
Hay Fork1520082003
Pescadero1120241992
Lakeshore1020051973
Offield Mtn920091975
Gazelle920011988
Burnt Ranch920162001
Little Truckee920221997
Rio Dell820111972
Lake Hemet819761970
Tuolumne Grove720111973
Pilot Creek719961994
Medicine Mtn.720212000
Bass Lake620112002
Onyx619941994
Butte Meadow620131974
Meadow Valley620181999
Friday Ridge620241995
Lassen Park519871973
Martins Fy519871981

Pine Siskin Population Trend in Other States

alaskaarizonacoloradoconnecticutidahoiowamainemarylandmassachusettsmichiganminnesotamontananebraskanevadanew-hampshirenew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotatennesseeutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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