Birds in Colorado in September

Percent of complete checklists in Colorado that reported the bird during these weeks, 2016–2025 (111,425 checklists). It shows how likely you are to list the bird, not how many there are. Methods.

1. 1Northern Flicker43%
2. 2Black-capped Chickadee38%
3. 3House Finch38%
4. 4Blue Jay32%
5. 5American Robin31%
6. 6Mallard30%
7. 7Black-billed Magpie29%
8. 8Mourning Dove24%
9. 9American Crow23%
10. 10Canada Goose23%
11. 11Wilson's Warbler22%
12. 12Barn Swallow22%
13. 13Eurasian Collared-Dove21%
14. 14European Starling20%
15. 15White-breasted Nuthatch19%
16. 16Red-tailed Hawk19%
17. 17American Goldfinch18%
18. 18Red-winged Blackbird18%
19. 19Downy Woodpecker17%
20. 20Killdeer17%
21. 21Yellow-rumped Warbler17%
22. 22Great Blue Heron17%
23. 23Mountain Chickadee17%
24. 24Chipping Sparrow16%
25. 25Common Raven16%
26. 26Ring-billed Gull16%
27. 27Double-crested Cormorant15%
28. 28Lesser Goldfinch14%
29. 29Spotted Towhee14%
30. 30Broad-tailed Hummingbird14%
31. 31Red-breasted Nuthatch14%
32. 32Turkey Vulture14%
33. 33Steller's Jay13%
34. 34Song Sparrow13%
35. 35Say's Phoebe13%
36. 36Belted Kingfisher12%
37. 37White-crowned Sparrow11%
38. 38Rock Pigeon11%
39. 39American Kestrel11%
40. 40Northern House Wren11%
41. 41House Sparrow10%
42. 42American White Pelican10%

• White-crowned Sparrowfirst arrivals late September, peaks the second week of October
• Pied-billed Grebefirst arrivals late September, peaks late October
• Common Merganserfirst arrivals early September, peaks mid January
• Ring-necked Duckfirst arrivals the second week of September, peaks mid March
• Townsend's Solitairefirst arrivals the second week of September, peaks the second week of December
• Northern Pintailfirst arrivals early September, peaks the second week of March
• Cassin's Finchfirst arrivals mid September, peaks the second week of April
• Sandhill Cranefirst arrivals late September, peaks the second week of October
• American Dipperfirst arrivals mid September, peaks the second week of January
• Bonaparte's Gullfirst arrivals late September, peaks the second week of November

• Mourning Dovemost gone by the second week of September
• Broad-tailed Hummingbirdmost gone by the second week of September
• Northern Yellow Warblermost gone by early September
• Northern House Wrenmost gone by the second week of September
• Barn Swallowmost gone by late September
• American Goldfinchmost gone by the second week of September
• Western Wood-Peweemost gone by the second week of September
• Western Kingbirdmost gone by early September
• Western Tanagermost gone by the second week of September
• Rufous Hummingbirdmost gone by early September
• Spotted Sandpipermost gone by the second week of September
• Gray Catbirdmost gone by mid September

43. 43Woodhouse's Scrub-Jay9.9%
44. 44Western Meadowlark9.8%
45. 45Dark-eyed Junco9.6%
46. 46Vesper Sparrow9.2%
47. 47American Coot9.2%
48. 48Snowy Egret8.9%
49. 49Pygmy Nuthatch8.0%
50. 50Western Wood-Pewee8.0%
51. 51Pied-billed Grebe7.8%
52. 52Orange-crowned Warbler7.7%
53. 53Pine Siskin7.5%
54. 54Hairy Woodpecker6.8%
55. 55Osprey6.6%
56. 56Common Grackle6.4%
57. 57Cooper's Hawk6.2%
58. 58Ruby-crowned Kinglet6.1%
59. 59Gray Catbird6.0%
60. 60Green-winged Teal5.8%