Uncommon Birds in Colorado
Our list for Colorado has 81 uncommon birds recorded regularly there: 11 residents, 25 summer visitors, 24 winter visitors and 21 passage migrants
Most likely in October
GBIF · Oct
Share of all bird records in Colorado in October, 2019–2024. Each month links to that month’s page.
All 81, most common first
Rose-breasted GrosbeakPheucticus ludovicianusPassage migrantUncommon18–22 cmRegularly May–Oct
Willow FlycatcherEmpidonax trailliiSummer visitorUncommon13–17 cmRegularly May–Sep
BobolinkDolichonyx oryzivorusSummer visitorUncommon16–20 cmRegularly May–Jul
OvenbirdSeiurus aurocapillaSummer visitorUncommon12–15 cmRegularly May–Sep
Lapland LongspurCalcarius lapponicusWinter visitorUncommon15–16 cmRegularly Oct–Apr
Swamp SparrowMelospiza georgianaWinter visitorUncommon12–15 cmRegularly Oct–Apr
Semipalmated PloverCharadrius semipalmatusPassage migrantUncommon17–19 cmRegularly Apr–Oct
Great Black-backed GullLarus marinusWinter visitorUncommon64–79 cmRegularly Nov–Mar
Eastern Screech-owlMegascops asioWinter visitorUncommon16–25 cmRecorded all year
Grey PloverPluvialis squatarolaPassage migrantUncommon27–30 cmRegularly May–Nov
Red-throated LoonGavia stellataWinter visitorUncommon53–69 cmRegularly Oct–Feb
Surf ScoterMelanitta perspicillataPassage migrantUncommon48–60 cmRegularly Oct–Dec
Data: EOD – eBird Observation Dataset (Cornell Lab of Ornithology), accessed via GBIF.org, CC BY 4.0. Records from 2019–2024, aggregated and filtered by Birdfact. How these lists are made