BirdAnalyst
Species · BCR 10 · BBS 2025 Release · 1966–2024

Lark Sparrow In Northern Rockies

All regionsNorthern RockiesGrassland birds

Lark Sparrow in Northern Rockies has risen sharply: up 61% on the route-weighted index since 1970.

+61%Since 1970
126Routes In Region
56Years

Notable Signals

long arc increasecomputed index

Lark Sparrow has risen sharply in Northern Rockies: up 61% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Lark Sparrow in Northern Rockies is projected to fall about 24% by 2029 — from 2.1 in 2024 to a central estimate of 1.6 (95% range 0.70–2.4). A 5-year backtest shows a typical error of ±18.8%, with 100% of held-out values landing inside the 95% band.

-24%Change by 2029
1.6Projected 2029 index
0.70–2.495% range
±18.8%Backtest error
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 index95% low95% high
20251.50.662.4
20261.50.672.4
20271.60.682.4
20281.60.692.4
20291.60.702.4

Routes In Northern Rockies

Routes recording Lark Sparrow in Northern Rockies.
LysiteWYOMING472024
TensleepWYOMING322024
LaurelMONTANA232022
GeboWYOMING232024
Muddy CreekMONTANA182015
Browns ParkCOLORADO152024
BasinWYOMING142024
MadrasOREGON122024
NowoodWYOMING112024
LovellWYOMING112024
WorlandWYOMING112024
TwickenhamOREGON102024
WamsutterWYOMING101995
Patrick Draw 4WYOMING92002
MaybellCOLORADO72024
OttoWYOMING72024
DuboisWYOMING72024
CrowheartWYOMING72021
PathfinderWYOMING72024
CascadeIDAHO61983
Crane CreekIDAHO62019
EtheteWYOMING62024
SweetwaterWYOMING62017
HarmonyWYOMING62008
LayCOLORADO52024

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