BirdAnalyst
Species · BCR 33 · BBS 2025 Release · 1966–2024

House Finch In Sonoran and Mojave Deserts

All regionsSonoran and Mojave DesertsGeneralists

House Finch in Sonoran and Mojave Deserts has declined: down 36% on the route-weighted index since 1970.

-36%Since 1970TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
87Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for House Finch in Sonoran and Mojave Deserts. See the full index history below.

House Finch In Sonoran and Mojave Deserts Population Forecast

If the recent trend holds, House Finch in Sonoran and Mojave Deserts is projected to stay roughly flat through 2029, near 16 (95% range 5.9–26). A 5-year backtest shows a typical error of ±9.1%, with 100% of held-out values landing inside the 95% band.

-5%Change by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
16Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
5.9–2695% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±9.1%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, House Finch in Sonoran and Mojave Deserts is projected to stay roughly flat through 2029, near 16 (95% range 5.9–26). A 5-year backtest shows a typical error of ±9.1%, with 100% of held-out values landing inside the 95% band.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 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
2025166.526
2026166.426
2027166.226
2028166.126
2029165.926

Routes In Sonoran and Mojave Deserts

Routes recording House Finch in Sonoran and Mojave Deserts.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Joshua TreeCALIFORNIA1542002
Willow SpgsCALIFORNIA1121981
Calif CityCALIFORNIA1062015
Joshua Tree 2CALIFORNIA1022016
New RiverARIZONA752016
OnyxCALIFORNIA652015
FlorenceARIZONA591988
WildroseCALIFORNIA532022
Anza BorregoCALIFORNIA502024
InyokernCALIFORNIA492024
Willow Springs 2CALIFORNIA482024
RivieraARIZONA462024
Kelso ValleyCALIFORNIA452024
NelsonNEVADA432024
PearblossomCALIFORNIA422024
Casa GrandeARIZONA402023
Organ PipeARIZONA402023
Ajo 2ARIZONA342022
ArabyARIZONA332023
Cactus ForestARIZONA322024
WickenburgARIZONA262023
AlamoNEVADA241973
Alamo RiverCALIFORNIA232018
Cutter 2ARIZONA212018
LukevilleARIZONA191981

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