BirdAnalyst
Species · BCR 29 · BBS 2025 Release · 1966–2024

Ruby-throated Hummingbird In Piedmont

All regionsPiedmontGeneralists

Ruby-throated Hummingbird in Piedmont has risen sharply: up 58% on the route-weighted index since 1968.

+58%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 →
154Routes 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 →
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 SignalsNotable 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 →

Ruby-throated Hummingbird has risen sharply in Piedmont: up 58% on the route-weighted index since 1968.

Ruby-throated Hummingbird In Piedmont Population Forecast

If the recent trend holds, Ruby-throated Hummingbird in Piedmont is projected to rise about 137% by 2029 — from 0.37 in 2024 to a central estimate of 0.87 (95% range 0.54–1.2). A 5-year backtest shows a typical error of ±46%, with 80% of held-out values landing inside the 95% band.

+137%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 →
0.87Projected 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 →
0.54–1.295% 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 →
±46%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, Ruby-throated Hummingbird in Piedmont is projected to rise about 137% by 2029 — from 0.37 in 2024 to a central estimate of 0.87 (95% range 0.54–1.2). A 5-year backtest shows a typical error of ±46%, with 80% 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 →
20250.830.511.2
20260.840.521.2
20270.850.521.2
20280.860.531.2
20290.870.541.2

Routes In Piedmont

Routes recording Ruby-throated Hummingbird in Piedmont.
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 →
FinchleyVIRGINIA82021
Little MtnSOUTH-CAROLINA51988
JordanNORTH-CAROLINA42008
CherryvilleNORTH-CAROLINA41966
MetasvilleGEORGIA32000
WhitesburgGEORGIA32024
ElamsvilleVIRGINIA32014
RinggoldVIRGINIA32023
AppomattoxVIRGINIA32024
MillervilleALABAMA22023
Liberty CityALABAMA22009
WedoweeALABAMA22022
CrestGEORGIA22018
SiloamGEORGIA22013
HiramGEORGIA22018
JulietteGEORGIA22024
Lincolnton 2GEORGIA22023
Curry HillGEORGIA22019
Good HopeGEORGIA22024
EmmitsburgMARYLAND22024
OlneyMARYLAND22024
EkloMARYLAND22018
MadonnaMARYLAND22022
EarltonMARYLAND22022
MooresvilleNORTH-CAROLINA22001

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