WhenToBird

Aythya affinis · Anatidae

When Do Lesser Scaups Arrive in Maryland?

Adult male Lesser Scaup
Photo: Paul Lewis, CC BY 4.0 via iNaturalist

Lesser Scaups are winter birds in Maryland: the first arrive in early November, they are common by mid November, peak in early March (7.4% of checklists), and most are gone by the second week of April.

When to look

First arrivalsNov 1-7early November
Common byNov 15-21mid November
PeakMar 1-7early March
Most gone byApr 8-14the second week of April

Best: early March. First arrivals early November; most are gone by the second week of April. Peak: on about 7.4% of Maryland checklists.

  1. Janpeak season
  2. Febpeak season
  3. Marpeak season
  4. Aprcommon
  5. Maynot usually seen
  6. Junnot usually seen
  7. Julnot usually seen
  8. Augnot usually seen
  9. Sepnot usually seen
  10. Octrare
  11. Novcommon
  12. Deccommon

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

0%5%10%Jan 1-7: 4.5% of 28716 checklistsJan 8-14: 4.9% of 21449 checklistsJan 15-21: 5.1% of 21267 checklistsJan 22-31: 5.8% of 29144 checklistsFeb 1-7: 6.4% of 21347 checklistsFeb 8-14: 6.0% of 22166 checklistsFeb 15-21: 5.6% of 29986 checklistsFeb 22-28: 8.2% of 22427 checklistsMar 1-7: 7.3% of 21389 checklistsMar 8-14: 6.6% of 22192 checklistsMar 15-21: 5.8% of 22823 checklistsMar 22-31: 4.5% of 33720 checklistsApr 1-7: 3.6% of 25513 checklistsApr 8-14: 2.2% of 27718 checklistsApr 15-21: 1.3% of 29328 checklistsApr 22-30: 0.4% of 42595 checklistsMay 1-7: 0.2% of 38532 checklistsMay 8-14: 0.3% of 42722 checklistsMay 15-21: 0.2% of 31936 checklistsMay 22-31: 0.2% of 36903 checklistsJun 1-7: 0.2% of 23191 checklistsJun 8-14: 0.1% of 21853 checklistsJun 15-21: 0.1% of 21000 checklistsJun 22-30: 0.2% of 25133 checklistsJul 1-7: 0.1% of 18715 checklistsJul 8-14: 0.1% of 16376 checklistsJul 15-21: 0.1% of 15793 checklistsJul 22-31: 0.1% of 21969 checklistsAug 1-7: 0.1% of 16013 checklistsAug 8-14: 0.1% of 15249 checklistsAug 15-21: 0.1% of 15674 checklistsAug 22-31: 0.1% of 24925 checklistsSep 1-7: 0.1% of 19808 checklistsSep 8-14: 0.2% of 18513 checklistsSep 15-21: 0.1% of 21901 checklistsSep 22-30: 0.1% of 22901 checklistsOct 1-7: 0.1% of 19111 checklistsOct 8-14: 0.1% of 18482 checklistsOct 15-21: 0.3% of 17380 checklistsOct 22-31: 0.6% of 23992 checklistsNov 1-7: 1.5% of 17915 checklistsNov 8-14: 2.1% of 18905 checklistsNov 15-21: 2.7% of 16259 checklistsNov 22-30: 3.0% of 22852 checklistsDec 1-7: 4.0% of 16108 checklistsDec 8-14: 3.7% of 16512 checklistsDec 15-21: 3.4% of 18952 checklistsDec 22-31: 3.7% of 29728 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 Maryland 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 Maryland

Best counties

Share of checklists at the peak
  1. Dorchester CountyBest the second week of February · 753 checklists that week, 26,161 in all25%
  2. Queen Anne's CountyBest early March · 494 checklists that week, 26,875 in all22%
  3. Garrett CountyBest mid March · 682 checklists that week, 37,616 in all18%
  4. Talbot CountyBest early March · 627 checklists that week, 31,140 in all16%
  5. Kent CountyBest late November · 372 checklists that week, 13,396 in all14%
  6. Charles CountyBest early March · 184 checklists that week, 10,064 in all13%

Best spots

Share of checklists at the peak
  1. Pinks PondDorchester County, best late March · 23 checklists that week, 1,328 in all93%
  2. Middle Branch ParkBaltimore County, best early February · 22 checklists that week, 221 in all87%
  3. Masonville Cove Environmental CenterBaltimore County, best late December · 58 checklists that week, 2,879 in all86%
  4. North Point State Park (Shallow Creek)Baltimore County, best the second week of March · 22 checklists that week, 502 in all78%
  5. Damazo PondFrederick County, best early March · 27 checklists that week, 690 in all77%
  6. Brandon ShoresAnne Arundel County, best late January · 20 checklists that week, 1,129 in all74%

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

Best time of day

In Maryland, the Lesser Scaup is most often listed on checklists started between 11 am and 1 pm (2.8% of those checklists).

0%1%2%3%12 am: too few checklists (486) to judge1 am: too few checklists (451) to judge2 am: too few checklists (447) to judge3 am: too few checklists (766) to judge4 am: too few checklists (2076) to judge5 am: too few checklists (11098) to judge6 am: 1.3% of 56604 checklists7 am: 1.8% of 139255 checklists8 am: 1.9% of 148626 checklists9 am: 2.4% of 126820 checklists10 am: 2.6% of 106973 checklists11 am: 2.8% of 87483 checklists12 pm: 2.8% of 74808 checklists1 pm: 2.8% of 69428 checklists2 pm: 2.8% of 67800 checklists3 pm: 2.7% of 67688 checklists4 pm: 2.5% of 60927 checklists5 pm: 1.6% of 43876 checklists6 pm: 1.0% of 32930 checklists7 pm: too few checklists (19051) to judge8 pm: too few checklists (5708) to judge9 pm: too few checklists (1977) to judge10 pm: too few checklists (1170) to judge11 pm: too few checklists (635) 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
January4.5%4.9%5.1%5.8%
February6.4%6.0%5.6%8.2%
March7.3%6.6%5.8%4.5%
April3.6%2.2%1.3%0.4%
May0.2%0.3%0.2%0.2%
June0.2%0.1%0.1%0.2%
July0.1%0.1%0.1%0.1%
August0.1%0.1%0.1%0.1%
September0.1%0.2%0.1%0.1%
October0.1%0.1%0.3%0.6%
November1.5%2.1%2.7%3.0%
December4.0%3.7%3.4%3.7%

Neighboring states

  • District of Columbia: arrives late October, 1 week earlier than Maryland
  • Delaware: arrives early November, in the same week than Maryland
  • Virginia: arrives early November, in the same week than Maryland
  • Pennsylvania: arrives early November, in the same week than Maryland

Common questions

When do Lesser Scaups arrive in Maryland?
Lesser Scaups are winter birds in Maryland: the first arrive in early November, they are common by mid November, peak in early March (7.4% of checklists), and most are gone by the second week of April.
When do Lesser Scaups leave Maryland?
Most Lesser Scaups have left Maryland by the second week of April, when reports fall below half their usual rate. Stragglers are still reported until mid April.
When is the best time to see a Lesser Scaup in Maryland?
The Lesser Scaup is reported most often in early March, on about 7.4% of Maryland checklists.
Where in Maryland are Lesser Scaups seen most often?
By county, Dorchester County, Queen Anne's County, and Garrett County have the highest peak reporting rates for the Lesser Scaup (counties with at least 200 checklists).