WhenToBird

Melanitta americana · Anatidae

When Do Black Scoters Arrive in Wisconsin?

Adult male Black Scoter
Photo: Kevin Krebs, CC BY 4.0 via iNaturalist

Black Scoters mostly pass through Wisconsin: they arrive in mid October, peak in the second week of November (2.2% of checklists), and most are gone by early December.

When to look

First arrivalsOct 15-21mid October
Common byOct 15-21mid October
PeakNov 8-14the second week of November
Most gone byDec 1-7early December

Best: the second week of November. First arrivals mid October; most are gone by early December. Peak: on about 2.2% of Wisconsin checklists.

  1. Janrare
  2. Febnot usually seen
  3. Marnot usually seen
  4. Aprnot usually seen
  5. Maynot usually seen
  6. Junnot usually seen
  7. Julnot usually seen
  8. Augnot usually seen
  9. Sepnot usually seen
  10. Octpeak season
  11. Novpeak season
  12. Deccommon

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

0%1%2%3%Jan 1-7: 0.2% of 27925 checklistsJan 8-14: 0.2% of 18337 checklistsJan 15-21: 0.1% of 17370 checklistsJan 22-31: 0.1% of 23777 checklistsFeb 1-7: 0.1% of 16656 checklistsFeb 8-14: 0.1% of 18286 checklistsFeb 15-21: 0.1% of 24739 checklistsFeb 22-28: 0.1% of 20113 checklistsMar 1-7: 0.1% of 24024 checklistsMar 8-14: 0.1% of 26722 checklistsMar 15-21: 0.1% of 27238 checklistsMar 22-31: 0.1% of 40171 checklistsApr 1-7: 0.1% of 34961 checklistsApr 8-14: 0.1% of 39128 checklistsApr 15-21: 0.1% of 38887 checklistsApr 22-30: 0.1% of 57231 checklistsMay 1-7: 0.1% of 55115 checklistsMay 8-14: 0.1% of 63098 checklistsMay 15-21: 0.1% of 49821 checklistsMay 22-31: 0.1% of 56796 checklistsJun 1-7: 0% of 33621 checklistsJun 8-14: 0% of 31282 checklistsJun 15-21: 0% of 30186 checklistsJun 22-30: 0.1% of 35128 checklistsJul 1-7: 0.1% of 27088 checklistsJul 8-14: 0% of 23293 checklistsJul 15-21: 0% of 20933 checklistsJul 22-31: 0.1% of 27595 checklistsAug 1-7: 0.1% of 19147 checklistsAug 8-14: 0% of 18286 checklistsAug 15-21: 0% of 19195 checklistsAug 22-31: 0% of 28229 checklistsSep 1-7: 0% of 22408 checklistsSep 8-14: 0% of 20857 checklistsSep 15-21: 0% of 20707 checklistsSep 22-30: 0.1% of 26469 checklistsOct 1-7: 0.1% of 21069 checklistsOct 8-14: 0.1% of 21011 checklistsOct 15-21: 0.8% of 20006 checklistsOct 22-31: 1.9% of 26362 checklistsNov 1-7: 2.3% of 18928 checklistsNov 8-14: 2.2% of 17052 checklistsNov 15-21: 2.0% of 16291 checklistsNov 22-30: 1.5% of 20564 checklistsDec 1-7: 0.7% of 15354 checklistsDec 8-14: 0.3% of 16294 checklistsDec 15-21: 0.2% of 21430 checklistsDec 22-31: 0.1% of 26314 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 Wisconsin 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 Wisconsin

Best counties

Share of checklists at the peak
  1. Kewaunee CountyBest mid November · 102 checklists that week, 9,747 in all15%
  2. Racine CountyBest the second week of November · 246 checklists that week, 18,400 in all9.8%
  3. Ashland CountyBest late October · 464 checklists that week, 16,576 in all7.8%
  4. Sheboygan CountyBest the second week of November · 395 checklists that week, 25,419 in all7.5%
  5. Milwaukee CountyBest the second week of November · 1752 checklists that week, 114,667 in all7.3%
  6. Kenosha CountyBest the second week of November · 146 checklists that week, 11,654 in all5.6%

Best spots

Share of checklists at the peak
  1. Schluter BeachDane County, best late April · 23 checklists that week, 185 in all74%
  2. Bradford BeachMilwaukee County, best early November · 104 checklists that week, 1,397 in all69%
  3. Lake Park (southeast)Milwaukee County, best the second week of November · 67 checklists that week, 1,366 in all68%
  4. Olbrich ParkDane County, best late October · 45 checklists that week, 400 in all49%
  5. Shoop Park Golf CourseRacine County, best late November · 62 checklists that week, 1,575 in all46%

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

Best time of day

In Wisconsin, the Black Scoter is most often listed on checklists started between 10 am and 12 pm (0.3% of those checklists).

0%0.5%12 am: too few checklists (993) to judge1 am: too few checklists (844) to judge2 am: too few checklists (839) to judge3 am: too few checklists (1488) to judge4 am: too few checklists (5344) to judge5 am: 0.1% of 27016 checklists6 am: 0.1% of 83973 checklists7 am: 0.1% of 160717 checklists8 am: 0.2% of 160531 checklists9 am: 0.3% of 136968 checklists10 am: 0.3% of 119110 checklists11 am: 0.3% of 99116 checklists12 pm: 0.3% of 85078 checklists1 pm: 0.3% of 80688 checklists2 pm: 0.3% of 79140 checklists3 pm: 0.2% of 78599 checklists4 pm: 0.2% of 69767 checklists5 pm: 0.1% of 53229 checklists6 pm: 0.1% of 38769 checklists7 pm: too few checklists (24396) to judge8 pm: too few checklists (10155) to judge9 pm: too few checklists (4990) to judge10 pm: too few checklists (2463) to judge11 pm: too few checklists (1281) 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
January0.2%0.2%0.1%0.1%
February0.1%0.1%0.1%0.1%
March0.1%0.1%0.1%0.1%
April0.1%0.1%0.1%0.1%
May0.1%0.1%0.1%0.1%
June0%0%0%0.1%
July0.1%0%0%0.1%
August0.1%0%0%0%
September0%0%0%0.1%
October0.1%0.1%0.8%1.9%
November2.3%2.2%2.0%1.5%
December0.7%0.3%0.2%0.1%

Neighboring states

  • Michigan: arrives the second week of October, 1 week earlier than Wisconsin
  • Minnesota: arrives mid October, in the same week than Wisconsin
  • Indiana: arrives early November, 2 weeks later than Wisconsin
  • Ohio: arrives late October, 1 week later than Wisconsin

Common questions

When do Black Scoters arrive in Wisconsin?
Black Scoters mostly pass through Wisconsin: they arrive in mid October, peak in the second week of November (2.2% of checklists), and most are gone by early December.
When do Black Scoters leave Wisconsin?
Most Black Scoters have left Wisconsin by early December, when reports fall below half their usual rate.
When is the best time to see a Black Scoter in Wisconsin?
The Black Scoter is reported most often in the second week of November, on about 2.2% of Wisconsin checklists.
Where in Wisconsin are Black Scoters seen most often?
By county, Kewaunee County, Racine County, and Ashland County have the highest peak reporting rates for the Black Scoter (counties with at least 200 checklists).