WhenToBird

Nannopterum auritum · Phalacrocoracidae

When Do Double-crested Cormorants Arrive in South Dakota?

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

Double-crested Cormorants reach South Dakota in mid March, are common by early April, peak in mid April (16% of checklists), and most are gone by mid November.

When to look

First arrivalsMar 15-21mid March
Common byApr 1-7early April
PeakApr 15-21mid April
Most gone byNov 15-21mid November

Best: mid April. First arrivals mid March; most are gone by mid November. Peak: on about 16% of South Dakota checklists.

  1. Janrare
  2. Febnot usually seen
  3. Maruncommon
  4. Aprpeak season
  5. Maypeak season
  6. Jununcommon
  7. Julcommon
  8. Augcommon
  9. Sepcommon
  10. Octpeak season
  11. Novcommon
  12. Decuncommon

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

0%5%10%15%20%Jan 1-7: 0.7% of 1699 checklistsJan 8-14: 0.5% of 967 checklistsJan 15-21: 0.1% of 893 checklistsJan 22-31: 0% of 1338 checklistsFeb 1-7: 0% of 898 checklistsFeb 8-14: 0.1% of 1013 checklistsFeb 15-21: 0% of 1650 checklistsFeb 22-28: 0% of 1011 checklistsMar 1-7: 0% of 1304 checklistsMar 8-14: 0.1% of 1447 checklistsMar 15-21: 0.4% of 1524 checklistsMar 22-31: 2.9% of 2850 checklistsApr 1-7: 6.9% of 2170 checklistsApr 8-14: 13% of 2259 checklistsApr 15-21: 17% of 2578 checklistsApr 22-30: 16% of 3858 checklistsMay 1-7: 13% of 3532 checklistsMay 8-14: 11% of 4498 checklistsMay 15-21: 10% of 4211 checklistsMay 22-31: 8.1% of 5094 checklistsJun 1-7: 5.2% of 3279 checklistsJun 8-14: 4.2% of 3503 checklistsJun 15-21: 4.6% of 2861 checklistsJun 22-30: 6.1% of 3893 checklistsJul 1-7: 7.2% of 2666 checklistsJul 8-14: 6.9% of 2554 checklistsJul 15-21: 7.3% of 2412 checklistsJul 22-31: 9.8% of 2746 checklistsAug 1-7: 11% of 1842 checklistsAug 8-14: 13% of 1899 checklistsAug 15-21: 8.1% of 1757 checklistsAug 22-31: 9.0% of 2464 checklistsSep 1-7: 9.9% of 1894 checklistsSep 8-14: 9.5% of 1794 checklistsSep 15-21: 9.5% of 1671 checklistsSep 22-30: 9.3% of 2085 checklistsOct 1-7: 14% of 1429 checklistsOct 8-14: 15% of 1441 checklistsOct 15-21: 11% of 1330 checklistsOct 22-31: 11% of 1471 checklistsNov 1-7: 12% of 1168 checklistsNov 8-14: 9.8% of 1068 checklistsNov 15-21: 6.1% of 985 checklistsNov 22-30: 3.9% of 1108 checklistsDec 1-7: 2.7% of 890 checklistsDec 8-14: 2.3% of 957 checklistsDec 15-21: 0.6% of 1246 checklistsDec 22-31: 0.9% of 1514 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 South Dakota 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 South Dakota

Best counties

Share of checklists at the peak
  1. Day CountyBest the second week of June · 23 checklists that week, 794 in all62%
  2. Kingsbury CountyBest the second week of May · 29 checklists that week, 300 in all55%
  3. Edmunds CountyBest late June · 13 checklists that week, 466 in all52%
  4. Lyman CountyBest the second week of October · 15 checklists that week, 878 in all49%
  5. Hamlin CountyBest the second week of August · 15 checklists that week, 314 in all48%
  6. Codington CountyBest the second week of July · 29 checklists that week, 1,303 in all45%

Best spots

Share of checklists at the peak
  1. Oakwood Lakes Recreation AreaBrookings County, best early August · 23 checklists that week, 132 in all85%
  2. Oahe Downstream Recreation AreaStanley County, best late April · 31 checklists that week, 509 in all64%
  3. Farm IslandHughes County, best late April · 27 checklists that week, 825 in all56%
  4. Oaha Recreation AreaStanley County, best early May · 20 checklists that week, 247 in all51%
  5. Wall LakeMinnehaha County, best late September · 22 checklists that week, 450 in all49%
  6. Cow Creek Recreation AreaSully County, best late October · 23 checklists that week, 140 in all39%

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

Best time of day

In South Dakota, the Double-crested Cormorant is most often listed on checklists started between 8 and 10 am (9.0% of those checklists).

0%5%10%12 am: too few checklists (49) to judge1 am: too few checklists (44) to judge2 am: too few checklists (33) to judge3 am: too few checklists (59) to judge4 am: too few checklists (227) to judge5 am: too few checklists (1080) to judge6 am: 5.4% of 3387 checklists7 am: 7.3% of 7718 checklists8 am: 9.2% of 10342 checklists9 am: 8.8% of 10758 checklists10 am: 7.9% of 9123 checklists11 am: 7.1% of 7814 checklists12 pm: 7.0% of 6876 checklists1 pm: 7.1% of 6801 checklists2 pm: 8.2% of 6673 checklists3 pm: 7.9% of 6344 checklists4 pm: 7.1% of 6412 checklists5 pm: 7.3% of 5570 checklists6 pm: 8.5% of 4276 checklists7 pm: 7.4% of 3183 checklists8 pm: too few checklists (1499) to judge9 pm: too few checklists (329) to judge10 pm: too few checklists (82) to judge11 pm: too few checklists (42) 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
January0.7%0.5%0.1%0%
February0%0.1%0%0%
March0%0.1%0.4%2.9%
April6.9%13%17%16%
May13%11%10%8.1%
June5.2%4.2%4.6%6.1%
July7.2%6.9%7.3%9.8%
August11%13%8.1%9.0%
September9.9%9.5%9.5%9.3%
October14%15%11%11%
November12%9.8%6.1%3.9%
December2.7%2.3%0.6%0.9%

Neighboring states

  • Nebraska: arrives early March, 2 weeks earlier than South Dakota
  • North Dakota: arrives early April, 2 weeks later than South Dakota
  • Minnesota: arrives mid March, in the same week than South Dakota
  • Iowa: arrives the second week of March, 1 week earlier than South Dakota

Common questions

When do Double-crested Cormorants arrive in South Dakota?
Double-crested Cormorants reach South Dakota in mid March, are common by early April, peak in mid April (16% of checklists), and most are gone by mid November.
When do Double-crested Cormorants leave South Dakota?
Most Double-crested Cormorants have left South Dakota by mid November, when reports fall below half their usual rate. Stragglers are still reported until mid December.
When is the best time to see a Double-crested Cormorant in South Dakota?
The Double-crested Cormorant is reported most often in mid April, on about 16% of South Dakota checklists.
Where in South Dakota are Double-crested Cormorants seen most often?
By county, Day County, Kingsbury County, and Edmunds County have the highest peak reporting rates for the Double-crested Cormorant (counties with at least 200 checklists).