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

Swainson's Hawk In Sonoran and Mojave Deserts

All regionsSonoran and Mojave DesertsGeneralists

Swainson's Hawk in Sonoran and Mojave Deserts has fallen sharply: down 54% on the route-weighted index since 1975.

-54%Since 1975
15Routes In Region
28Years

Notable Signals

long arc declinecomputed index

Swainson's Hawk has fallen sharply in Sonoran and Mojave Deserts: down 54% on the route-weighted index since 1975.

Forecast

If the recent trend holds, Swainson's Hawk in Sonoran and Mojave Deserts is projected to stay roughly flat through 2029, near 0.07 (95% range 0.00–0.17). A 5-year backtest shows a typical error of ±168.9%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029
0.07Projected 2029 index
0.00–0.1795% range
±168.9%Backtest error
19702029
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
20250.070.000.17
20260.070.000.17
20270.070.000.17
20280.070.000.17
20290.070.000.17

Routes In Sonoran and Mojave Deserts

Routes recording Swainson's Hawk in Sonoran and Mojave Deserts.
DatelandARIZONA42016
CoolidgeARIZONA21982
Parker DamCALIFORNIA21975
GlamisCALIFORNIA21974
AntaresARIZONA12024
Red RockARIZONA12011
Cabeza PrietARIZONA11996
HopeARIZONA11996
Cactus ForestARIZONA12022
Cutter 2ARIZONA12018
Haiwee ResCALIFORNIA11999
Calif CityCALIFORNIA11980
Anza BorregoCALIFORNIA12011
BlytheCALIFORNIA11976
AlamoNEVADA11970

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