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Species · Utah · BBS 2025 Release · 1966–2024

Bewick's Wren Population Trend in Utah

All statesForest birds

Bewick's Wren in Utah has held roughly steady: down 8% on the route-weighted index since 1981.

-8%Since 1981TrendPercent 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 →
56Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
42YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Bewick's Wren Trends in UtahNotable 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 Bewick's Wren in Utah. See the full index history below.

Bewick's Wren Population Forecast in Utah

If the recent trend holds, Bewick's Wren in Utah is projected to rise about 27% by 2029 — from 0.41 in 2024 to a central estimate of 0.52 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±141.9%, with 100% of held-out values landing inside the 95% band.

+27%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 →
0.52Projected 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 →
0.00–1.195% 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 →
±141.9%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, Bewick's Wren in Utah is projected to rise about 27% by 2029 — from 0.41 in 2024 to a central estimate of 0.52 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±141.9%, with 100% of held-out values landing inside the 95% band.19722029
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 →
20250.510.001.1
20260.510.001.1
20270.510.001.1
20280.510.001.1
20290.520.001.1

Bewick's Wren Survey Routes in Utah

Routes recording Bewick's Wren in Utah.
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 →
Cane Spr Des819921992
Arches Np520061996
Vernon520241992
Shivwitz520241992
Alton420171997
Blanding420192005
Boulder320181986
Aneth320082008
Richfield320182000
Glen Canyon320232009
Westwater320241997
Tule Valley320131999
Jensen320002000
Bonanza319921992
Wah Wah320031989
Willow Creek220242000
Hanksville220232023
Navajo Lake220162016
Fayette220212005
Gooseberry220092003
Hatch220232000
Vernal220172003
La Sal 3220242007
Newcastle220211997
Escalante220182002

Bewick's Wren Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoidahoillinoisindianaiowakansaskentuckymarylandmississippimissourinevadanew-mexiconorth-carolinaohiooklahomaoregonpennsylvaniatennesseetexasvirginiawashingtonwest-virginiawisconsinwyoming

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