Birding spot · Pitkin County, Colorado
Birding at Hallam Lake: What You'll See Each Week In November, the birds most often reported at Hallam Lake are Mallard (87%), Black-billed Magpie (78%), and Black-capped Chickadee (76%). It is busiest in summer, when 49 species turn up on at least 1 in 20 checklists, and species counts peak in the second week of August (55 species). 112 species have been reported here across 1,206 complete checklists from 242 birders.
Species by week 0 20 40 60 Jan 1-7: 38 species on 5%+ of 20 checklists Jan 8-14: 20 species on 5%+ of 22 checklists Jan 15-21: 30 species on 5%+ of 16 checklists Jan 22-31: 33 species on 5%+ of 18 checklists Feb 1-7: 32 species on 5%+ of 13 checklists Feb 8-14: 30 species on 5%+ of 15 checklists Feb 15-21: 36 species on 5%+ of 15 checklists Feb 22-28: 32 species on 5%+ of 10 checklists Mar 1-7: 29 species on 5%+ of 12 checklists Mar 8-14: 36 species on 5%+ of 15 checklists Mar 15-21: 37 species on 5%+ of 29 checklists Mar 22-31: 38 species on 5%+ of 46 checklists Apr 1-7: 38 species on 5%+ of 42 checklists Apr 8-14: 45 species on 5%+ of 20 checklists Apr 15-21: 38 species on 5%+ of 30 checklists Apr 22-30: 46 species on 5%+ of 38 checklists May 1-7: 44 species on 5%+ of 32 checklists May 8-14: 38 species on 5%+ of 17 checklists May 15-21: 41 species on 5%+ of 33 checklists May 22-31: 40 species on 5%+ of 43 checklists Jun 1-7: 43 species on 5%+ of 36 checklists Jun 8-14: 36 species on 5%+ of 22 checklists Jun 15-21: 45 species on 5%+ of 35 checklists Jun 22-30: 45 species on 5%+ of 51 checklists Jul 1-7: 53 species on 5%+ of 16 checklists Jul 8-14: 48 species on 5%+ of 18 checklists Jul 15-21: 37 species on 5%+ of 26 checklists Jul 22-31: 49 species on 5%+ of 38 checklists Aug 1-7: 53 species on 5%+ of 20 checklists Aug 8-14: 55 species on 5%+ of 20 checklists Aug 15-21: 47 species on 5%+ of 26 checklists Aug 22-31: 53 species on 5%+ of 55 checklists Sep 1-7: 43 species on 5%+ of 22 checklists Sep 8-14: 47 species on 5%+ of 27 checklists Sep 15-21: 38 species on 5%+ of 23 checklists Sep 22-30: 35 species on 5%+ of 31 checklists Oct 1-7: 43 species on 5%+ of 20 checklists Oct 8-14: 42 species on 5%+ of 19 checklists Oct 15-21: 37 species on 5%+ of 11 checklists Oct 22-31: 38 species on 5%+ of 17 checklists Nov 1-7: 31 species on 5%+ of 22 checklists Nov 8-14: 27 species on 5%+ of 21 checklists Nov 15-21: 25 species on 5%+ of 22 checklists Nov 22-30: 20 species on 5%+ of 21 checklists Dec 1-7: 27 species on 5%+ of 27 checklists Dec 8-14: 23 species on 5%+ of 28 checklists Dec 15-21: 30 species on 5%+ of 28 checklists Dec 22-31: 34 species on 5%+ of 18 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 Mallard 87% 2 Black-billed Magpie 78% 3 Black-capped Chickadee 76% 4 American Crow 70% 5 American Dipper 58% 6 Mountain Chickadee 49% 7 Belted Kingfisher 44% 8 White-breasted Nuthatch 36% 9 Steller's Jay 35% 10 Pied-billed Grebe 29% 11 Common Raven 24% 12 Pygmy Nuthatch 24% 13 Song Sparrow 24% 14 Canada Goose 16% 15 Red-breasted Nuthatch 15% 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.
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 .
Mallard87%
Black-billed Magpie78%
Black-capped Chickadee76%
American Crow70%
American Dipper58%
Mountain Chickadee49%
Belted Kingfisher44%
White-breasted Nuthatch36%
Steller's Jay35%
Pied-billed Grebe29%
Common Raven24%
Pygmy Nuthatch24%
Song Sparrow24%
Canada Goose16%
Red-breasted Nuthatch15%