Birds in Colorado in August

Percent of complete checklists in Colorado that reported the bird during these weeks, 2016–2025 (110,489 checklists). It shows how likely you are to list the bird, not how many there are. Methods.

1. 1House Finch39%
2. 2Broad-tailed Hummingbird36%
3. 3Black-capped Chickadee34%
4. 4Northern Flicker33%
5. 5Mourning Dove32%
6. 6Barn Swallow29%
7. 7American Robin28%
8. 8Mallard26%
9. 9American Goldfinch26%
10. 10Eurasian Collared-Dove23%
11. 11American Crow22%
12. 12Blue Jay22%
13. 13Black-billed Magpie20%
14. 14Lesser Goldfinch20%
15. 15Northern House Wren19%
16. 16Canada Goose19%
17. 17Red-winged Blackbird19%
18. 18White-breasted Nuthatch18%
19. 19Mountain Chickadee18%
20. 20Western Wood-Pewee18%
21. 21Red-tailed Hawk17%
22. 22Great Blue Heron17%
23. 23Chipping Sparrow16%
24. 24Northern Yellow Warbler15%
25. 25Killdeer14%
26. 26Downy Woodpecker14%
27. 27Double-crested Cormorant14%
28. 28Spotted Towhee14%
29. 29European Starling14%
30. 30House Sparrow14%
31. 31Common Raven14%
32. 32Turkey Vulture12%
33. 33Rufous Hummingbird12%
34. 34Steller's Jay12%
35. 35Say's Phoebe12%
36. 36Western Kingbird12%
37. 37Red-breasted Nuthatch12%
38. 38Violet-green Swallow11%
39. 39Ring-billed Gull11%
40. 40Song Sparrow10%
41. 41Rock Pigeon10%

• Gadwallfirst arrivals late August, peaks the second week of April
• Northern Shovelerfirst arrivals the second week of August, peaks the second week of April
• Green-winged Tealfirst arrivals early August, peaks early April
• American Wigeonfirst arrivals mid August, peaks early November
• Red-breasted Nuthatchfirst arrivals the second week of August, peaks the second week of September
• Belted Kingfisherfirst arrivals mid August, peaks the second week of November
• Orange-crowned Warblerfirst arrivals early August, peaks late September
• Northern Harrierfirst arrivals the second week of August, peaks the second week of December
• Townsend's Warblerfirst arrivals mid August, peaks the second week of September

• Violet-green Swallowmost gone by the second week of August
• Cliff Swallowmost gone by early August
• Black-headed Grosbeakmost gone by mid August
• Western Flycatchermost gone by early August
• Pine Siskinmost gone by mid August
• Northern Rough-winged Swallowmost gone by the second week of August
• Lazuli Buntingmost gone by mid August
• Hermit Thrushmost gone by early August
• Cassin's Finchmost gone by the second week of August

42. 42Pine Siskin9.9%
43. 43American White Pelican9.5%
44. 44Pygmy Nuthatch9.1%
45. 45Spotted Sandpiper9.1%
46. 46Belted Kingfisher9.0%
47. 47Dark-eyed Junco8.9%
48. 48Snowy Egret8.8%
49. 49Common Grackle8.6%
50. 50Lark Sparrow8.6%
51. 51Black-chinned Hummingbird8.3%
52. 52American Kestrel8.0%
53. 53Osprey8.0%
54. 54Woodhouse's Scrub-Jay7.8%
55. 55Yellow-rumped Warbler7.5%
56. 56Western Meadowlark7.4%
57. 57Swainson's Hawk7.3%
58. 58Cedar Waxwing7.3%
59. 59Gray Catbird7.1%
60. 60Western Tanager7.0%