BirdAnalyst
Species · BCR 16 · BBS 2025 Release · 1966–2024

Cassin's Kingbird In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauAerial insectivores

Cassin's Kingbird in Southern Rockies / Colorado Plateau has edged down: down 19% on the route-weighted index since 1970.

-19%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 →
100Routes 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 →
56YearsYears 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 Cassin's Kingbird in Southern Rockies / Colorado Plateau. See the full index history below.

Cassin's Kingbird In Southern Rockies / Colorado Plateau Population Forecast

If the recent trend holds, Cassin's Kingbird in Southern Rockies / Colorado Plateau is projected to fall about 30% by 2029 — from 2.1 in 2024 to a central estimate of 1.5 (95% range 0.02–2.9). A 5-year backtest shows a typical error of ±26.8%, with 100% of held-out values landing inside the 95% band.

-30%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 →
1.5Projected 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 →
0.02–2.995% 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 →
±26.8%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, Cassin's Kingbird in Southern Rockies / Colorado Plateau is projected to fall about 30% by 2029 — from 2.1 in 2024 to a central estimate of 1.5 (95% range 0.02–2.9). A 5-year backtest shows a typical error of ±26.8%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20251.50.083.0
20261.50.063.0
20271.50.052.9
20281.50.032.9
20291.50.022.9

Routes In Southern Rockies / Colorado Plateau

Routes recording Cassin's Kingbird in Southern Rockies / Colorado Plateau.
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 →
HiteUTAH492023
PecosNEW-MEXICO442017
WalsenburgCOLORADO392024
La CienegaNEW-MEXICO392022
CokedaleCOLORADO282024
MountainairNEW-MEXICO212024
GreasewoodARIZONA192003
NageesiNEW-MEXICO182024
Fence LakeNEW-MEXICO182024
La PlataNEW-MEXICO162013
La Plata 2NEW-MEXICO162016
Peach SpringARIZONA142024
Claunch 2NEW-MEXICO132024
Salt LakeNEW-MEXICO112001
LudlowCOLORADO102016
HatchUTAH102024
Black MesaARIZONA91995
Ojo SarcoNEW-MEXICO92024
AnethUTAH92014
ZeniffARIZONA81984
DulceNEW-MEXICO82024
Angel Fire 2NEW-MEXICO82024
Salt Lake 2NEW-MEXICO82024
CounselorNEW-MEXICO72024
Mt. Taylor 2NEW-MEXICO72024

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