WhenToBird

Nannopterum auritum · Phalacrocoracidae

When Do Double-crested Cormorants Arrive in Alaska?

Adult Double-crested Cormorant
Photo: jubileej, CC0 1.0 via iNaturalist

Double-crested Cormorants are winter birds in Alaska: the first arrive in the second week of June, they are common by late June, peak in the second week of December (3.8% of checklists), and most are gone by early May.

When to look

First arrivalsJun 8-14the second week of June
Common byJun 22-30late June
PeakDec 8-14the second week of December
Most gone byMay 1-7early May

Best: the second week of December. First arrivals the second week of June; most are gone by early May. Peak: on about 3.8% of Alaska checklists.

  1. Jancommon
  2. Febcommon
  3. Marcommon
  4. Aprcommon
  5. Mayuncommon
  6. Jununcommon
  7. Juluncommon
  8. Auguncommon
  9. Seppeak season
  10. Octpeak season
  11. Novpeak season
  12. Decpeak season

Darker months: more checklists report it. Outlined: peak month.

0%2%4%6%Jan 1-7: 2.3% of 3788 checklistsJan 8-14: 2.6% of 2852 checklistsJan 15-21: 2.6% of 2810 checklistsJan 22-31: 2.6% of 3629 checklistsFeb 1-7: 2.7% of 2519 checklistsFeb 8-14: 2.9% of 2927 checklistsFeb 15-21: 2.2% of 3743 checklistsFeb 22-28: 2.2% of 2846 checklistsMar 1-7: 2.0% of 2904 checklistsMar 8-14: 2.7% of 3073 checklistsMar 15-21: 2.6% of 3359 checklistsMar 22-31: 2.2% of 5855 checklistsApr 1-7: 1.9% of 4329 checklistsApr 8-14: 1.6% of 4949 checklistsApr 15-21: 1.6% of 7114 checklistsApr 22-30: 1.6% of 10916 checklistsMay 1-7: 1.4% of 11827 checklistsMay 8-14: 1.0% of 14115 checklistsMay 15-21: 1.1% of 12152 checklistsMay 22-31: 0.9% of 19919 checklistsJun 1-7: 1.0% of 15816 checklistsJun 8-14: 1.0% of 17194 checklistsJun 15-21: 1.1% of 15943 checklistsJun 22-30: 1.2% of 16192 checklistsJul 1-7: 1.4% of 9815 checklistsJul 8-14: 1.4% of 8263 checklistsJul 15-21: 1.7% of 7081 checklistsJul 22-31: 1.3% of 9434 checklistsAug 1-7: 1.2% of 6380 checklistsAug 8-14: 1.7% of 6258 checklistsAug 15-21: 1.4% of 6114 checklistsAug 22-31: 1.4% of 8189 checklistsSep 1-7: 1.7% of 5848 checklistsSep 8-14: 2.5% of 4853 checklistsSep 15-21: 2.5% of 4415 checklistsSep 22-30: 3.6% of 5086 checklistsOct 1-7: 3.4% of 3576 checklistsOct 8-14: 2.9% of 4212 checklistsOct 15-21: 2.9% of 3339 checklistsOct 22-31: 3.6% of 4169 checklistsNov 1-7: 3.2% of 2844 checklistsNov 8-14: 4.2% of 2753 checklistsNov 15-21: 3.5% of 2291 checklistsNov 22-30: 2.8% of 3066 checklistsDec 1-7: 3.8% of 2199 checklistsDec 8-14: 3.5% of 2472 checklistsDec 15-21: 4.0% of 3071 checklistsDec 22-31: 3.2% of 3442 checklistsJanFebMarAprMayJunJulAugSepOctNovDec
Share of complete checklists reporting it, by week (4 per month). Grey bars: fewer than 10 checklists, not counted.

Frequency is the share of complete checklists in Alaska that listed the bird, 2016–2025. It is not a head count, and it follows where and when people go birding. How to read it.

JanFebMarAprMayJunJulAugSepOctNovDec
today
Second week of November

Each county is shaded by the share of complete checklists there that listed the bird, blended with the weeks either side. Darker is more often. It follows where people watch birds, not how many birds there are. How to read it.

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Where in Alaska

Best counties

Share of checklists at the peak
  1. Kodiak Island BoroughBest early November · 193 checklists that week, 11,483 in all31%
  2. Lake and Peninsula BoroughBest the second week of September · 16 checklists that week, 1,172 in all21%
  3. Aleutians West Census AreaBest mid February · 18 checklists that week, 6,087 in all20%
  4. Prince of Wales-Hyder Census AreaBest mid December · 52 checklists that week, 2,822 in all18%
  5. Aleutians East BoroughBest the second week of January · 11 checklists that week, 1,634 in all13%
  6. Yakutat City and BoroughBest early May · 47 checklists that week, 545 in all9.7%

Best spots

Share of checklists at the peak
  1. Fort Abercrombie State Historical ParkKodiak Island Borough, best late March · 26 checklists that week, 709 in all83%
  2. First Lake (northeast)Kenai Peninsula Borough, best late June · 20 checklists that week, 345 in all60%
  3. First LakeKenai Peninsula Borough, best mid July · 20 checklists that week, 494 in all46%
  4. Hoben ParkKenai Peninsula Borough, best mid June · 26 checklists that week, 282 in all44%
  5. Alaska Maritime National Wildlife RefugeKenai Peninsula Borough, best late June · 31 checklists that week, 189 in all40%

Busy spots report more of everything; compare the checklist counts before you drive anywhere.

Best time of day

In Alaska, the Double-crested Cormorant is most often listed on checklists started between 3 and 5 pm (2.6% of those checklists).

0%1%2%3%12 am: too few checklists (549) to judge1 am: too few checklists (365) to judge2 am: too few checklists (291) to judge3 am: too few checklists (624) to judge4 am: too few checklists (1241) to judge5 am: too few checklists (3532) to judge6 am: 0.7% of 9751 checklists7 am: 1.0% of 17236 checklists8 am: 1.3% of 24936 checklists9 am: 1.6% of 30139 checklists10 am: 2.1% of 30866 checklists11 am: 2.1% of 28207 checklists12 pm: 1.9% of 25650 checklists1 pm: 2.2% of 24144 checklists2 pm: 2.2% of 23323 checklists3 pm: 2.9% of 20763 checklists4 pm: 2.4% of 18245 checklists5 pm: 1.5% of 14895 checklists6 pm: 1.4% of 11707 checklists7 pm: 1.1% of 9365 checklists8 pm: 1.0% of 6934 checklists9 pm: too few checklists (4176) to judge10 pm: too few checklists (2050) to judge11 pm: too few checklists (952) to judge12a3a6a9a12p3p6p9p
Share of checklists started in each local hour that reported it. It reflects when people go birding as well as when birds are active. Grey hours have too few checklists (under 2% of the state’s, or under 200) to judge.
Week-by-week table
MonthDays 1-78-1415-2122-end
January2.3%2.6%2.6%2.6%
February2.7%2.9%2.2%2.2%
March2.0%2.7%2.6%2.2%
April1.9%1.6%1.6%1.6%
May1.4%1.0%1.1%0.9%
June1.0%1.0%1.1%1.2%
July1.4%1.4%1.7%1.3%
August1.2%1.7%1.4%1.4%
September1.7%2.5%2.5%3.6%
October3.4%2.9%2.9%3.6%
November3.2%4.2%3.5%2.8%
December3.8%3.5%4.0%3.2%

Neighboring states

  • Washington: arrives early September, 11 weeks later than Alaska
  • Oregon: arrives early September, 11 weeks later than Alaska
  • Idaho: arrives the second week of July, 4 weeks later than Alaska
  • Montana: arrives mid March, 11 weeks earlier than Alaska

Common questions

When do Double-crested Cormorants arrive in Alaska?
Double-crested Cormorants are winter birds in Alaska: the first arrive in the second week of June, they are common by late June, peak in the second week of December (3.8% of checklists), and most are gone by early May.
When do Double-crested Cormorants leave Alaska?
Most Double-crested Cormorants have left Alaska by early May, when reports fall below half their usual rate. Stragglers are still reported until the second week of May.
When is the best time to see a Double-crested Cormorant in Alaska?
The Double-crested Cormorant is reported most often in the second week of December, on about 3.8% of Alaska checklists.
Where in Alaska are Double-crested Cormorants seen most often?
By county, Kodiak Island Borough, Lake and Peninsula Borough, and Aleutians West Census Area have the highest peak reporting rates for the Double-crested Cormorant (counties with at least 200 checklists).