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Species · Delaware · BBS 2025 Release · 1966–2024

Red-bellied Woodpecker Population Trend in Delaware

All statesForest birds

Red-bellied Woodpecker in Delaware has surged: up 134% on the route-weighted index since 1968.

+134%Since 1968TrendPercent 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 →
17Routes 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 →
58YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Red-bellied Woodpecker Trends in DelawareNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Red-bellied Woodpecker has surged in Delaware: up 134% on the route-weighted index since 1968.

Red-bellied Woodpecker Population Forecast in Delaware

If the recent trend holds, Red-bellied Woodpecker in Delaware is projected to rise about 32% by 2029 — from 7.6 in 2024 to a central estimate of 10 (95% range 5.6–14). A 5-year backtest shows a typical error of ±23.5%, with 60% of held-out values landing inside the 95% band.

+32%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 →
10Projected 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 →
5.6–1495% 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 →
±23.5%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, Red-bellied Woodpecker in Delaware is projected to rise about 32% by 2029 — from 7.6 in 2024 to a central estimate of 10 (95% range 5.6–14). A 5-year backtest shows a typical error of ±23.5%, with 60% of held-out values landing inside the 95% band.19662029
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 →
20259.75.314
20269.85.414
20279.95.514
202810.05.514
2029105.614

Red-bellied Woodpecker Survey Routes in Delaware

Routes recording Red-bellied Woodpecker in Delaware.
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 →
Milton 22220172017
Harrington1620241966
Milton1120161966
Pepperbox820161998
Mt Pleasant720191966
Millsboro720242017
Pepperbox 2720242017
Blackbird620241994
Frankford520121966
Holleyville520041966
Dover419871966
Wilmington320141966
Frederica320141966
Bethany Bch319861967
Lowes Xrds219911966
Holleyville 2220242006
Georgetown220221992

Red-bellied Woodpecker Population Trend in Other States

alabamaarkansasconnecticutfloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsin

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