BirdAnalyst
Species · BCR 33 · BBS 2026 Release · 1966–2025

Western Meadowlark In Sonoran and Mojave Deserts

All regionsSonoran and Mojave DesertsGrassland birds

Western Meadowlark in Sonoran and Mojave Deserts has increased: up 37% on the route-weighted index since 1970.

+37%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 →
57Routes 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 →
57YearsYears 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 Western Meadowlark in Sonoran and Mojave Deserts. See the full index history below.

Western Meadowlark In Sonoran and Mojave Deserts Population Forecast

If the recent trend holds, Western Meadowlark in Sonoran and Mojave Deserts is projected to stay roughly flat through 2030, near 4.6 (95% range 0.01–9.2). A 5-year backtest shows a typical error of ±36.2%, with 100% of held-out values landing inside the 95% band.

-5%Change by 2030TrendPercent 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 →
4.6Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.01–9.295% 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 →
±36.2%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, Western Meadowlark in Sonoran and Mojave Deserts is projected to stay roughly flat through 2030, near 4.6 (95% range 0.01–9.2). A 5-year backtest shows a typical error of ±36.2%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20264.70.089.3
20274.70.079.3
20284.70.059.3
20294.60.039.2
20304.60.019.2

Routes In Sonoran and Mojave Deserts

Routes recording Western Meadowlark 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 →
NilandCALIFORNIA972025
Alamo RiverCALIFORNIA602018
BrawleyCALIFORNIA302012
Kelso ValleyCALIFORNIA292025
Willow SpgsCALIFORNIA171981
BarstowCALIFORNIA171998
FlorenceARIZONA81988
PearblossomCALIFORNIA82025
Palo VerdeARIZONA72013
HopeARIZONA72004
Cactus ForestARIZONA62024
Palo VerdeCALIFORNIA52023
GoldstoneCALIFORNIA32004
GlamisCALIFORNIA31995
LenwoodCALIFORNIA32012
CimaCALIFORNIA31998
LagunaARIZONA22021
Cibola LakeARIZONA21996
ArabyARIZONA22013
Casa GrandeARIZONA22019
Haiwee ResCALIFORNIA22005
OnyxCALIFORNIA22001
InyokernCALIFORNIA22011
EssexCALIFORNIA21995
Coachella CnCALIFORNIA21978

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.