WhenToBird

Birding spot · Arapahoe County, Colorado

Birding at Aurora Reservoir: What You'll See Each Week

In November, the birds most often reported at Aurora Reservoir are Bufflehead (86%), Mallard (86%), and Ring-billed Gull (85%). It is busiest in spring, when 77 species turn up on at least 1 in 20 checklists, and species counts peak in late April (75 species). 165 species have been reported here across 901 complete checklists from 340 birders.

Species by week

020406080Jan 1-7: 58 species on 5%+ of 52 checklistsJan 8-14: 54 species on 5%+ of 84 checklistsJan 15-21: 56 species on 5%+ of 91 checklistsJan 22-31: 48 species on 5%+ of 79 checklistsFeb 1-7: 55 species on 5%+ of 19 checklistsFeb 8-14: 45 species on 5%+ of 24 checklistsFeb 15-21: 44 species on 5%+ of 21 checklistsFeb 22-28: low data (6 checklists)Mar 1-7: 49 species on 5%+ of 11 checklistsMar 8-14: 51 species on 5%+ of 13 checklistsMar 15-21: low data (7 checklists)Mar 22-31: 48 species on 5%+ of 13 checklistsApr 1-7: low data (5 checklists)Apr 8-14: 69 species on 5%+ of 13 checklistsApr 15-21: 65 species on 5%+ of 12 checklistsApr 22-30: 75 species on 5%+ of 12 checklistsMay 1-7: low data (9 checklists)May 8-14: low data (9 checklists)May 15-21: low data (4 checklists)May 22-31: low data (4 checklists)Jun 1-7: low data (7 checklists)Jun 8-14: low data (5 checklists)Jun 15-21: low data (3 checklists)Jun 22-30: low data (4 checklists)Jul 1-7: low data (5 checklists)Jul 8-14: low data (8 checklists)Jul 15-21: low data (3 checklists)Jul 22-31: low data (3 checklists)Aug 1-7: low data (2 checklists)Aug 8-14: low data (6 checklists)Aug 15-21: low data (5 checklists)Aug 22-31: low data (4 checklists)Sep 1-7: low data (6 checklists)Sep 8-14: low data (9 checklists)Sep 15-21: low data (9 checklists)Sep 22-30: low data (9 checklists)Oct 1-7: low data (7 checklists)Oct 8-14: 50 species on 5%+ of 26 checklistsOct 15-21: 57 species on 5%+ of 11 checklistsOct 22-31: 63 species on 5%+ of 32 checklistsNov 1-7: 58 species on 5%+ of 16 checklistsNov 8-14: 61 species on 5%+ of 24 checklistsNov 15-21: 65 species on 5%+ of 35 checklistsNov 22-30: 63 species on 5%+ of 35 checklistsDec 1-7: 51 species on 5%+ of 21 checklistsDec 8-14: 58 species on 5%+ of 21 checklistsDec 15-21: 68 species on 5%+ of 16 checklistsDec 22-31: 61 species on 5%+ of 81 checklistsJanFebMarAprMayJunJulAugSepOctNovDec
Number of species reported on at least 5% of complete checklists, by week (4 per month). Grey bars: fewer than 10 checklists, not counted.

In November: what to expect

  1. 1Bufflehead86%
  2. 2Mallard86%
  3. 3Ring-billed Gull85%
  4. 4Canada Goose77%
  5. 5Common Goldeneye74%
  6. 6American Coot73%
  7. 7Ruddy Duck58%
  8. 8American Herring Gull55%
  9. 9Cackling Goose55%
  10. 10Pied-billed Grebe55%
  11. 11Northern Shoveler48%
  12. 12Western Grebe45%
  13. 13Gadwall45%
  14. 14California Gull42%
  15. 15Horned Grebe41%

Share of complete checklists at this spot that reported the bird in November. The sparkline is the whole year, with this month highlighted.

Season by season

Winter 59 species

  1. Ring-billed Gull87%
  2. Common Goldeneye85%
  3. Mallard73%
  4. Canada Goose69%
  5. American Coot68%

Spring 77 species

  1. Red-winged Blackbird85%
  2. Western Meadowlark77%
  3. Mallard71%
  4. American Robin70%
  5. Canada Goose69%

Summer 65 species

  1. Double-crested Cormorant84%
  2. Red-winged Blackbird84%
  3. Common Grackle76%
  4. Canada Goose65%
  5. Barn Swallow64%

Fall 69 species

  1. Mallard84%
  2. Ring-billed Gull82%
  3. Canada Goose71%
  4. American Coot64%
  5. Bufflehead62%

Specialties

Birds reported far more often here than across Colorado.

Nearby spots

Frequency is the share of complete checklists at this location that listed the bird, 2016–2025. Busy places report more of everything, and the weekly chart counts species on at least 5% of checklists so a few stray reports do not inflate it. How to read it.