WhenToBird

Birding spot · Adams County, Colorado

Birding at Derby Lake: What You'll See Each Week

In November, the birds most often reported at Derby Lake are Mallard (74%), Ring-billed Gull (69%), and Gadwall (66%). It is busiest in spring, when 64 species turn up on at least 1 in 20 checklists, and species counts peak in early May (66 species). 169 species have been reported here across 1,677 complete checklists from 810 birders.

Species by week

020406080Jan 1-7: 37 species on 5%+ of 20 checklistsJan 8-14: low data (7 checklists)Jan 15-21: low data (5 checklists)Jan 22-31: 31 species on 5%+ of 16 checklistsFeb 1-7: 39 species on 5%+ of 12 checklistsFeb 8-14: 31 species on 5%+ of 14 checklistsFeb 15-21: 37 species on 5%+ of 17 checklistsFeb 22-28: 39 species on 5%+ of 14 checklistsMar 1-7: 31 species on 5%+ of 22 checklistsMar 8-14: 39 species on 5%+ of 29 checklistsMar 15-21: 41 species on 5%+ of 30 checklistsMar 22-31: 50 species on 5%+ of 54 checklistsApr 1-7: 51 species on 5%+ of 47 checklistsApr 8-14: 50 species on 5%+ of 46 checklistsApr 15-21: 57 species on 5%+ of 45 checklistsApr 22-30: 61 species on 5%+ of 69 checklistsMay 1-7: 66 species on 5%+ of 48 checklistsMay 8-14: 58 species on 5%+ of 41 checklistsMay 15-21: 57 species on 5%+ of 34 checklistsMay 22-31: 52 species on 5%+ of 47 checklistsJun 1-7: 51 species on 5%+ of 28 checklistsJun 8-14: 54 species on 5%+ of 22 checklistsJun 15-21: 59 species on 5%+ of 34 checklistsJun 22-30: 47 species on 5%+ of 31 checklistsJul 1-7: 47 species on 5%+ of 23 checklistsJul 8-14: 55 species on 5%+ of 30 checklistsJul 15-21: 40 species on 5%+ of 24 checklistsJul 22-31: 57 species on 5%+ of 37 checklistsAug 1-7: 58 species on 5%+ of 31 checklistsAug 8-14: 48 species on 5%+ of 42 checklistsAug 15-21: 57 species on 5%+ of 60 checklistsAug 22-31: 53 species on 5%+ of 44 checklistsSep 1-7: 48 species on 5%+ of 31 checklistsSep 8-14: 46 species on 5%+ of 37 checklistsSep 15-21: 45 species on 5%+ of 31 checklistsSep 22-30: 47 species on 5%+ of 52 checklistsOct 1-7: 47 species on 5%+ of 32 checklistsOct 8-14: 50 species on 5%+ of 38 checklistsOct 15-21: 44 species on 5%+ of 46 checklistsOct 22-31: 49 species on 5%+ of 55 checklistsNov 1-7: 45 species on 5%+ of 45 checklistsNov 8-14: 49 species on 5%+ of 40 checklistsNov 15-21: 47 species on 5%+ of 49 checklistsNov 22-30: 36 species on 5%+ of 52 checklistsDec 1-7: 38 species on 5%+ of 34 checklistsDec 8-14: 32 species on 5%+ of 38 checklistsDec 15-21: 38 species on 5%+ of 34 checklistsDec 22-31: 39 species on 5%+ of 40 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. 1Mallard74%
  2. 2Ring-billed Gull69%
  3. 3Gadwall66%
  4. 4Bufflehead65%
  5. 5Canada Goose65%
  6. 6Hooded Merganser65%
  7. 7Ring-necked Duck52%
  8. 8American Coot49%
  9. 9Green-winged Teal45%
  10. 10American Wigeon45%
  11. 11Redhead45%
  12. 12Bald Eagle44%
  13. 13Lesser Scaup44%
  14. 14Pied-billed Grebe39%
  15. 15Northern Shoveler38%

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 35 species

  1. Bald Eagle71%
  2. Ring-billed Gull68%
  3. Mallard64%
  4. Common Goldeneye55%
  5. Canada Goose53%

Spring 64 species

  1. Gadwall70%
  2. Canada Goose70%
  3. Mallard65%
  4. Killdeer59%
  5. Northern Shoveler57%

Summer 54 species

  1. Mallard68%
  2. Canada Goose67%
  3. Snowy Egret62%
  4. Mourning Dove61%
  5. Double-crested Cormorant60%

Fall 48 species

  1. Mallard70%
  2. Ring-billed Gull64%
  3. Gadwall60%
  4. Canada Goose51%
  5. Pied-billed Grebe46%

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.