WhenToBird

Birding spot · Contra Costa County, California

Birding at Inner Harbor Basin: What You'll See Each Week

In November, the birds most often reported at Inner Harbor Basin are Double-crested Cormorant (83%), American Crow (81%), and Canada Goose (79%). It is busiest in winter, when 67 species turn up on at least 1 in 20 checklists, and species counts peak in mid January (76 species). 135 species have been reported here across 1,010 complete checklists from 283 birders.

Species by week

020406080Jan 1-7: 72 species on 5%+ of 57 checklistsJan 8-14: 63 species on 5%+ of 52 checklistsJan 15-21: 76 species on 5%+ of 59 checklistsJan 22-31: 60 species on 5%+ of 53 checklistsFeb 1-7: 67 species on 5%+ of 29 checklistsFeb 8-14: 55 species on 5%+ of 26 checklistsFeb 15-21: 58 species on 5%+ of 47 checklistsFeb 22-28: 62 species on 5%+ of 38 checklistsMar 1-7: 69 species on 5%+ of 35 checklistsMar 8-14: 60 species on 5%+ of 32 checklistsMar 15-21: 59 species on 5%+ of 30 checklistsMar 22-31: 63 species on 5%+ of 25 checklistsApr 1-7: 71 species on 5%+ of 19 checklistsApr 8-14: 59 species on 5%+ of 12 checklistsApr 15-21: 60 species on 5%+ of 11 checklistsApr 22-30: 53 species on 5%+ of 11 checklistsMay 1-7: low data (2 checklists)May 8-14: low data (4 checklists)May 15-21: low data (7 checklists)May 22-31: low data (1 checklists)Jun 1-7: low data (1 checklists)Jun 8-14: low data (5 checklists)Jun 15-21: low data (5 checklists)Jun 22-30: low data (5 checklists)Jul 1-7: 48 species on 5%+ of 11 checklistsJul 8-14: 42 species on 5%+ of 13 checklistsJul 15-21: 34 species on 5%+ of 10 checklistsJul 22-31: 34 species on 5%+ of 10 checklistsAug 1-7: 41 species on 5%+ of 15 checklistsAug 8-14: low data (9 checklists)Aug 15-21: 35 species on 5%+ of 21 checklistsAug 22-31: 42 species on 5%+ of 13 checklistsSep 1-7: 31 species on 5%+ of 12 checklistsSep 8-14: low data (6 checklists)Sep 15-21: low data (5 checklists)Sep 22-30: low data (7 checklists)Oct 1-7: low data (4 checklists)Oct 8-14: low data (8 checklists)Oct 15-21: 52 species on 5%+ of 11 checklistsOct 22-31: 54 species on 5%+ of 13 checklistsNov 1-7: 51 species on 5%+ of 12 checklistsNov 8-14: 56 species on 5%+ of 14 checklistsNov 15-21: 60 species on 5%+ of 12 checklistsNov 22-30: 71 species on 5%+ of 20 checklistsDec 1-7: 68 species on 5%+ of 40 checklistsDec 8-14: 64 species on 5%+ of 48 checklistsDec 15-21: 63 species on 5%+ of 42 checklistsDec 22-31: 65 species on 5%+ of 88 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. 1Double-crested Cormorant83%
  2. 2American Crow81%
  3. 3Canada Goose79%
  4. 4Pelagic Cormorant79%
  5. 5Western Gull78%
  6. 6American Coot69%
  7. 7White-crowned Sparrow62%
  8. 8Horned Grebe59%
  9. 9Brown Pelican57%
  10. 10Spotted Sandpiper55%
  11. 11Black Phoebe53%
  12. 12Pied-billed Grebe48%
  13. 13California Gull47%
  14. 14Black Oystercatcher45%
  15. 15Ring-billed Gull45%

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 67 species

  1. Bufflehead91%
  2. American Coot88%
  3. Eared Grebe77%
  4. Canada Goose76%
  5. Horned Grebe76%

Spring 64 species

  1. Canada Goose87%
  2. American Crow81%
  3. Western Gull81%
  4. White-crowned Sparrow76%
  5. American Coot75%

Summer 41 species

  1. American Crow86%
  2. Western Gull84%
  3. Brown Pelican81%
  4. Canada Goose75%
  5. Double-crested Cormorant64%

Fall 51 species

  1. American Crow85%
  2. Western Gull82%
  3. Double-crested Cormorant81%
  4. Canada Goose80%
  5. Pelagic Cormorant69%

Specialties

Birds reported far more often here than across California.

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.