WhenToBird

Birding spot · Boulder County, Colorado

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

In November, the birds most often reported at Erie Lake are Ring-necked Duck (80%), Mallard (74%), and Bufflehead (73%). It is busiest in spring, when 49 species turn up on at least 1 in 20 checklists, and species counts peak in mid April (55 species). 99 species have been reported here across 923 complete checklists from 268 birders.

Species by week

0204060Jan 1-7: 33 species on 5%+ of 102 checklistsJan 8-14: 34 species on 5%+ of 50 checklistsJan 15-21: 40 species on 5%+ of 38 checklistsJan 22-31: 35 species on 5%+ of 66 checklistsFeb 1-7: 32 species on 5%+ of 24 checklistsFeb 8-14: 33 species on 5%+ of 26 checklistsFeb 15-21: 37 species on 5%+ of 35 checklistsFeb 22-28: 36 species on 5%+ of 36 checklistsMar 1-7: 44 species on 5%+ of 17 checklistsMar 8-14: 32 species on 5%+ of 45 checklistsMar 15-21: 40 species on 5%+ of 51 checklistsMar 22-31: 45 species on 5%+ of 60 checklistsApr 1-7: 40 species on 5%+ of 33 checklistsApr 8-14: 48 species on 5%+ of 17 checklistsApr 15-21: 55 species on 5%+ of 20 checklistsApr 22-30: 53 species on 5%+ of 15 checklistsMay 1-7: low data (8 checklists)May 8-14: low data (3 checklists)May 15-21: low data (1 checklists)May 22-31: low data (5 checklists)Jun 1-7: low data (4 checklists)Jun 8-14: low data (6 checklists)Jun 15-21: low data (6 checklists)Jun 22-30: low data (0 checklists)Jul 1-7: low data (2 checklists)Jul 8-14: low data (2 checklists)Jul 15-21: low data (2 checklists)Jul 22-31: low data (5 checklists)Aug 1-7: low data (3 checklists)Aug 8-14: low data (5 checklists)Aug 15-21: low data (2 checklists)Aug 22-31: low data (4 checklists)Sep 1-7: low data (3 checklists)Sep 8-14: low data (1 checklists)Sep 15-21: low data (2 checklists)Sep 22-30: low data (4 checklists)Oct 1-7: low data (2 checklists)Oct 8-14: low data (3 checklists)Oct 15-21: 29 species on 5%+ of 10 checklistsOct 22-31: 41 species on 5%+ of 17 checklistsNov 1-7: 34 species on 5%+ of 21 checklistsNov 8-14: 47 species on 5%+ of 15 checklistsNov 15-21: 41 species on 5%+ of 16 checklistsNov 22-30: 40 species on 5%+ of 33 checklistsDec 1-7: 36 species on 5%+ of 23 checklistsDec 8-14: 43 species on 5%+ of 15 checklistsDec 15-21: 47 species on 5%+ of 18 checklistsDec 22-31: 38 species on 5%+ of 47 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. 1Ring-necked Duck80%
  2. 2Mallard74%
  3. 3Bufflehead73%
  4. 4Redhead72%
  5. 5Canada Goose64%
  6. 6American Wigeon61%
  7. 7Ring-billed Gull56%
  8. 8Common Goldeneye52%
  9. 9Cackling Goose48%
  10. 10Red-winged Blackbird40%
  11. 11Gadwall39%
  12. 12Canvasback34%
  13. 13European Starling34%
  14. 14Pied-billed Grebe33%
  15. 15Rock Pigeon33%

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 36 species

  1. Ring-necked Duck90%
  2. Canada Goose83%
  3. Common Goldeneye81%
  4. American Wigeon81%
  5. Ring-billed Gull79%

Spring 49 species

  1. Mallard79%
  2. Bufflehead73%
  3. Canada Goose66%
  4. Red-winged Blackbird62%
  5. Gadwall60%

Summer 34 species

  1. Mallard83%
  2. Barn Swallow76%
  3. Double-crested Cormorant71%
  4. Red-winged Blackbird66%
  5. Canada Goose56%

Fall 39 species

  1. Mallard68%
  2. Ring-necked Duck61%
  3. Redhead59%
  4. Canada Goose54%
  5. Bufflehead52%

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.