WhenToBird

Melanitta americana · Anatidae

When Do Black Scoters Arrive in Maine?

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

Black Scoters are winter birds in Maine: the first arrive in late September, they are common by late October, peak in early December (8.1% of checklists), and most are gone by early April.

When to look

First arrivalsSep 22-30late September
Common byOct 22-31late October
PeakDec 1-7early December
Most gone byApr 1-7early April

Best: early December. First arrivals late September; most are gone by early April. Peak: on about 8.1% of Maine checklists.

  1. Janpeak season
  2. Febpeak season
  3. Marcommon
  4. Aprcommon
  5. Mayuncommon
  6. Jununcommon
  7. Julrare
  8. Augrare
  9. Seprare
  10. Octcommon
  11. Novpeak season
  12. Decpeak season

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

0%5%10%Jan 1-7: 7.9% of 15499 checklistsJan 8-14: 8.0% of 11141 checklistsJan 15-21: 7.7% of 10729 checklistsJan 22-31: 8.5% of 15084 checklistsFeb 1-7: 7.6% of 9403 checklistsFeb 8-14: 7.8% of 11268 checklistsFeb 15-21: 6.4% of 14061 checklistsFeb 22-28: 7.3% of 9977 checklistsMar 1-7: 5.8% of 9649 checklistsMar 8-14: 5.3% of 11781 checklistsMar 15-21: 3.9% of 11613 checklistsMar 22-31: 3.8% of 17798 checklistsApr 1-7: 2.9% of 14638 checklistsApr 8-14: 2.9% of 16511 checklistsApr 15-21: 2.6% of 17164 checklistsApr 22-30: 2.0% of 22602 checklistsMay 1-7: 2.1% of 22556 checklistsMay 8-14: 1.7% of 27842 checklistsMay 15-21: 2.0% of 27748 checklistsMay 22-31: 2.2% of 38715 checklistsJun 1-7: 1.8% of 26916 checklistsJun 8-14: 0.8% of 23737 checklistsJun 15-21: 0.7% of 22733 checklistsJun 22-30: 0.5% of 28248 checklistsJul 1-7: 0.5% of 20290 checklistsJul 8-14: 0.5% of 18534 checklistsJul 15-21: 0.4% of 17319 checklistsJul 22-31: 0.5% of 22815 checklistsAug 1-7: 0.7% of 15004 checklistsAug 8-14: 0.9% of 14603 checklistsAug 15-21: 1.0% of 14972 checklistsAug 22-31: 0.8% of 19813 checklistsSep 1-7: 0.7% of 14567 checklistsSep 8-14: 0.5% of 14520 checklistsSep 15-21: 0.6% of 14339 checklistsSep 22-30: 1.0% of 16879 checklistsOct 1-7: 1.6% of 12959 checklistsOct 8-14: 2.2% of 13168 checklistsOct 15-21: 2.7% of 11184 checklistsOct 22-31: 4.2% of 13717 checklistsNov 1-7: 6.3% of 9823 checklistsNov 8-14: 6.5% of 9007 checklistsNov 15-21: 6.5% of 8528 checklistsNov 22-30: 7.8% of 10228 checklistsDec 1-7: 8.8% of 7505 checklistsDec 8-14: 7.8% of 7982 checklistsDec 15-21: 6.9% of 10455 checklistsDec 22-31: 8.4% of 14285 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 Maine 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 Maine

Best counties

Share of checklists at the peak
  1. York CountyBest early December · 1296 checklists that week, 101,844 in all22%
  2. Cumberland CountyBest early February · 2352 checklists that week, 169,501 in all11%
  3. Sagadahoc CountyBest mid December · 335 checklists that week, 21,736 in all10%
  4. Hancock CountyBest the second week of November · 1238 checklists that week, 118,358 in all10%
  5. Washington CountyBest mid January · 202 checklists that week, 35,967 in all6.9%
  6. Knox CountyBest early March · 336 checklists that week, 34,453 in all6.9%

Best spots

Share of checklists at the peak
  1. Nubble Light and Sohier ParkYork County, best early January · 128 checklists that week, 2,150 in all96%
  2. Bald HeadYork County, best late February · 21 checklists that week, 606 in all93%
  3. Little BeachYork County, best early January · 52 checklists that week, 1,164 in all89%
  4. Trundy PointCumberland County, best mid January · 28 checklists that week, 190 in all88%
  5. Two Lights State ParkCumberland County, best the second week of February · 66 checklists that week, 1,503 in all88%
  6. Dyer CoveCumberland County, best early April · 23 checklists that week, 2,660 in all87%

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

Best time of day

In Maine, the Black Scoter is most often listed on checklists started between 12 and 2 pm (4.7% of those checklists).

0%2%4%6%12 am: too few checklists (510) to judge1 am: too few checklists (517) to judge2 am: too few checklists (581) to judge3 am: too few checklists (3242) to judge4 am: too few checklists (7221) to judge5 am: 1.5% of 19895 checklists6 am: 2.4% of 54578 checklists7 am: 2.0% of 92775 checklists8 am: 2.4% of 86962 checklists9 am: 3.2% of 78989 checklists10 am: 3.8% of 70954 checklists11 am: 4.3% of 59331 checklists12 pm: 4.5% of 50943 checklists1 pm: 4.8% of 49775 checklists2 pm: 4.5% of 49001 checklists3 pm: 3.8% of 43252 checklists4 pm: 2.5% of 33413 checklists5 pm: 1.6% of 25547 checklists6 pm: 1.1% of 18309 checklists7 pm: too few checklists (14287) to judge8 pm: too few checklists (5336) to judge9 pm: too few checklists (2253) to judge10 pm: too few checklists (1518) to judge11 pm: too few checklists (720) 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
January7.9%8.0%7.7%8.5%
February7.6%7.8%6.4%7.3%
March5.8%5.3%3.9%3.8%
April2.9%2.9%2.6%2.0%
May2.1%1.7%2.0%2.2%
June1.8%0.8%0.7%0.5%
July0.5%0.5%0.4%0.5%
August0.7%0.9%1.0%0.8%
September0.7%0.5%0.6%1.0%
October1.6%2.2%2.7%4.2%
November6.3%6.5%6.5%7.8%
December8.8%7.8%6.9%8.4%

Neighboring states

  • New Hampshire: arrives mid October, 3 weeks later than Maine
  • Massachusetts: arrives late September, in the same week than Maine
  • Vermont: arrives mid October, 3 weeks later than Maine
  • Rhode Island: arrives late September, in the same week than Maine

Common questions

When do Black Scoters arrive in Maine?
Black Scoters are winter birds in Maine: the first arrive in late September, they are common by late October, peak in early December (8.1% of checklists), and most are gone by early April.
When do Black Scoters leave Maine?
Most Black Scoters have left Maine by early April, when reports fall below half their usual rate. Stragglers are still reported until the second week of June.
When is the best time to see a Black Scoter in Maine?
The Black Scoter is reported most often in early December, on about 8.1% of Maine checklists.
Where in Maine are Black Scoters seen most often?
By county, York County, Cumberland County, and Sagadahoc County have the highest peak reporting rates for the Black Scoter (counties with at least 200 checklists).