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 · OctShare of all bird records in Colorado in October, 2019–2024. Each month links to that month’s page.
All 81, most common first
Hermit ThrushCatharus guttatusSummer visitorUncommon14–18 cmRegularly Apr–Dec
Great Horned OwlBubo virginianusResidentUncommon46–63 cmRecorded all year
Common LoonGavia immerWinter visitorUncommon66–91 cmRegularly Oct–Apr
Northern PintailAnas acutaWinter visitorUncommon59–76 cmRegularly Aug–Jun
American Herring GullLarus smithsonianusWinter visitorUncommon53–65 cmRegularly Sep–Apr
Red CrossbillLoxia curvirostraResidentUncommon15–17 cmRecorded all year
Franklin's GullLeucophaeus pipixcanPassage migrantUncommon32–36 cmRegularly Mar–Nov
Snow GooseAnser caerulescensWinter visitorUncommon69–84 cmRegularly Oct–Apr
Sandhill CraneAntigone canadensisWinter visitorUncommon80–122 cmRecorded all year
Red-naped SapsuckerSphyrapicus nuchalisSummer visitorUncommon19–21 cmRegularly Apr–Oct
Lesser YellowlegsTringa flavipesPassage migrantUncommon23–27 cmRegularly Apr–Oct
Baird's SandpiperCalidris bairdiiPassage migrantUncommon14–17 cmRegularly Apr–Oct
Northern MockingbirdMimus polyglottosSummer visitorUncommon21–26 cmRegularly Apr–Sep
Swainson's ThrushCatharus ustulatusSummer visitorUncommon16–20 cmRegularly May–Sep
Horned GrebePodiceps auritusWinter visitorUncommon31–38 cmRegularly Oct–May
Wood DuckAix sponsaResidentUncommon47–54 cmRecorded all year
Golden EagleAquila chrysaetosResidentUncommon66–102 cmRecorded all year
Bonaparte's GullChroicocephalus philadelphiaPassage migrantUncommon28–38 cmRegularly Oct–May
Wild TurkeyMeleagris gallopavoResidentUncommon100–125 cmRecorded all year
Wilson's PhalaropePhalaropus tricolorSummer visitorUncommon22–24 cmRegularly Apr–Sep
Rough-legged HawkButeo lagopusWinter visitorUncommon46–59 cmRegularly Nov–Apr
Least SandpiperCalidris minutillaPassage migrantUncommon13–15 cmRegularly Apr–Nov
Clay-colored SparrowSpizella pallidaPassage migrantUncommon13–15 cmRegularly May–Oct
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