Birding spot · Boulder County, Colorado
Birding at Hodgson-Harris Reservoir: What You'll See Each Week In November, the birds most often reported at Hodgson-Harris Reservoir are American Wigeon (98%), Mallard (98%), and Bufflehead (96%). It is busiest in spring, when 56 species turn up on at least 1 in 20 checklists, and species counts peak in the second week of May (62 species). 119 species have been reported here across 1,007 complete checklists from 109 birders.
Species by week 0 20 40 60 80 Jan 1-7: 31 species on 5%+ of 22 checklists Jan 8-14: 33 species on 5%+ of 15 checklists Jan 15-21: 28 species on 5%+ of 10 checklists Jan 22-31: 35 species on 5%+ of 40 checklists Feb 1-7: 34 species on 5%+ of 51 checklists Feb 8-14: 31 species on 5%+ of 20 checklists Feb 15-21: 29 species on 5%+ of 23 checklists Feb 22-28: 29 species on 5%+ of 12 checklists Mar 1-7: 30 species on 5%+ of 21 checklists Mar 8-14: 38 species on 5%+ of 18 checklists Mar 15-21: 38 species on 5%+ of 14 checklists Mar 22-31: 35 species on 5%+ of 22 checklists Apr 1-7: 42 species on 5%+ of 25 checklists Apr 8-14: 52 species on 5%+ of 43 checklists Apr 15-21: 58 species on 5%+ of 62 checklists Apr 22-30: 60 species on 5%+ of 68 checklists May 1-7: 54 species on 5%+ of 47 checklists May 8-14: 62 species on 5%+ of 33 checklists May 15-21: 51 species on 5%+ of 25 checklists May 22-31: 52 species on 5%+ of 48 checklists Jun 1-7: 41 species on 5%+ of 23 checklists Jun 8-14: 44 species on 5%+ of 24 checklists Jun 15-21: 39 species on 5%+ of 23 checklists Jun 22-30: 37 species on 5%+ of 31 checklists Jul 1-7: 55 species on 5%+ of 20 checklists Jul 8-14: 35 species on 5%+ of 25 checklists Jul 15-21: low data (8 checklists) Jul 22-31: 40 species on 5%+ of 11 checklists Aug 1-7: 32 species on 5%+ of 12 checklists Aug 8-14: low data (6 checklists) Aug 15-21: 40 species on 5%+ of 14 checklists Aug 22-31: low data (9 checklists) Sep 1-7: low data (6 checklists) Sep 8-14: low data (7 checklists) Sep 15-21: low data (9 checklists) Sep 22-30: 40 species on 5%+ of 17 checklists Oct 1-7: low data (6 checklists) Oct 8-14: 43 species on 5%+ of 16 checklists Oct 15-21: low data (9 checklists) Oct 22-31: 44 species on 5%+ of 11 checklists Nov 1-7: 38 species on 5%+ of 16 checklists Nov 8-14: 27 species on 5%+ of 11 checklists Nov 15-21: 33 species on 5%+ of 10 checklists Nov 22-30: 37 species on 5%+ of 13 checklists Dec 1-7: 28 species on 5%+ of 14 checklists Dec 8-14: 31 species on 5%+ of 12 checklists Dec 15-21: low data (8 checklists) Dec 22-31: 36 species on 5%+ of 17 checklists Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 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 American Wigeon 98% 2 Mallard 98% 3 Bufflehead 96% 4 Ring-necked Duck 94% 5 Gadwall 84% 6 Ring-billed Gull 76% 7 American Coot 56% 8 Northern Shoveler 56% 9 Green-winged Teal 52% 10 Pied-billed Grebe 52% 11 Canada Goose 48% 12 Common Goldeneye 38% 13 Lesser Scaup 38% 14 Redhead 38% 15 Ruddy Duck 36% 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 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 .
American Wigeon98%
Mallard98%
Bufflehead96%
Ring-necked Duck94%
Gadwall84%
Ring-billed Gull76%
American Coot56%
Northern Shoveler56%
Green-winged Teal52%
Pied-billed Grebe52%
Canada Goose48%
Common Goldeneye38%
Lesser Scaup38%
Redhead38%
Ruddy Duck36%