WhenToBird

Larus smithsonianus · Laridae

When Do American Herring Gulls Arrive in Maryland?

Adult American Herring Gull
Photo: Priya Sandhu, CC BY 4.0 via iNaturalist

American Herring Gulls are in Maryland all year, but most are here in winter: numbers build from mid October, peak in mid November (13% of checklists), and fall back by the second week of March. In the quietest week (the second week of May) they are still on about 2.7% of checklists.

When to look

Numbers buildOct 15-21mid October
PeakNov 15-21mid November
Fall back byMar 8-14the second week of March
FewestMay 8-14the second week of May

Best: mid November. Here all year; numbers build from mid October and fall back by the second week of March. Peak: on about 13% of Maryland checklists.

  1. Janpeak season
  2. Febpeak season
  3. Marcommon
  4. Aprcommon
  5. Mayuncommon
  6. Jununcommon
  7. Julcommon
  8. Augcommon
  9. Sepcommon
  10. Octcommon
  11. Novpeak season
  12. Decpeak season

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

0%5%10%15%Jan 1-7: 11% of 28716 checklistsJan 8-14: 11% of 21449 checklistsJan 15-21: 11% of 21267 checklistsJan 22-31: 12% of 29144 checklistsFeb 1-7: 12% of 21347 checklistsFeb 8-14: 10% of 22166 checklistsFeb 15-21: 9.6% of 29986 checklistsFeb 22-28: 11% of 22427 checklistsMar 1-7: 8.7% of 21389 checklistsMar 8-14: 8.5% of 22192 checklistsMar 15-21: 7.9% of 22823 checklistsMar 22-31: 6.7% of 33720 checklistsApr 1-7: 6.0% of 25513 checklistsApr 8-14: 4.5% of 27718 checklistsApr 15-21: 4.3% of 29328 checklistsApr 22-30: 3.8% of 42595 checklistsMay 1-7: 2.6% of 38532 checklistsMay 8-14: 2.6% of 42722 checklistsMay 15-21: 3.0% of 31936 checklistsMay 22-31: 3.1% of 36903 checklistsJun 1-7: 2.7% of 23191 checklistsJun 8-14: 2.9% of 21853 checklistsJun 15-21: 3.5% of 21000 checklistsJun 22-30: 3.6% of 25133 checklistsJul 1-7: 3.7% of 18715 checklistsJul 8-14: 4.9% of 16376 checklistsJul 15-21: 5.3% of 15793 checklistsJul 22-31: 5.7% of 21969 checklistsAug 1-7: 6.9% of 16013 checklistsAug 8-14: 6.7% of 15249 checklistsAug 15-21: 7.1% of 15674 checklistsAug 22-31: 6.2% of 24925 checklistsSep 1-7: 5.4% of 19808 checklistsSep 8-14: 5.7% of 18513 checklistsSep 15-21: 6.2% of 21901 checklistsSep 22-30: 6.6% of 22901 checklistsOct 1-7: 7.2% of 19111 checklistsOct 8-14: 7.6% of 18482 checklistsOct 15-21: 7.7% of 17380 checklistsOct 22-31: 8.5% of 23992 checklistsNov 1-7: 9.1% of 17915 checklistsNov 8-14: 15% of 18905 checklistsNov 15-21: 11% of 16259 checklistsNov 22-30: 12% of 22852 checklistsDec 1-7: 11% of 16108 checklistsDec 8-14: 10% of 16512 checklistsDec 15-21: 10% of 18952 checklistsDec 22-31: 13% 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. Worcester CountyBest the second week of August · 619 checklists that week, 44,596 in all60%
  2. Somerset CountyBest mid November · 57 checklists that week, 9,451 in all48%
  3. Queen Anne's CountyBest late January · 822 checklists that week, 26,875 in all32%
  4. Dorchester CountyBest the second week of December · 367 checklists that week, 26,161 in all30%
  5. Calvert CountyBest late November · 880 checklists that week, 43,807 in all27%
  6. Cecil CountyBest the second week of January · 313 checklists that week, 18,620 in all26%

Best spots

Share of checklists at the peak
  1. Congress Street ParkHarford County, best early January · 20 checklists that week, 300 in all98%
  2. Fort George G Mead JunctionAnne Arundel County, best early January · 37 checklists that week, 136 in all97%
  3. Ocean City InletWorcester County, best the second week of July · 27 checklists that week, 5,187 in all97%
  4. Sinepuxent Bay WmaWorcester County, best the second week of May · 26 checklists that week, 995 in all96%
  5. Ocean City Inlet (north)Worcester County, best late August · 51 checklists that week, 2,472 in all95%

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

Best time of day

In Maryland, the American Herring Gull is most often listed on checklists started between 12 and 2 pm (8.2% of those checklists).

0%5%10%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: 7.8% of 56604 checklists7 am: 7.3% of 139255 checklists8 am: 6.5% of 148626 checklists9 am: 7.3% of 126820 checklists10 am: 7.5% of 106973 checklists11 am: 8.1% of 87483 checklists12 pm: 8.3% of 74808 checklists1 pm: 8.1% of 69428 checklists2 pm: 7.8% of 67800 checklists3 pm: 7.7% of 67688 checklists4 pm: 6.3% of 60927 checklists5 pm: 4.8% of 43876 checklists6 pm: 3.8% 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
January11%11%11%12%
February12%10%9.6%11%
March8.7%8.5%7.9%6.7%
April6.0%4.5%4.3%3.8%
May2.6%2.6%3.0%3.1%
June2.7%2.9%3.5%3.6%
July3.7%4.9%5.3%5.7%
August6.9%6.7%7.1%6.2%
September5.4%5.7%6.2%6.6%
October7.2%7.6%7.7%8.5%
November9.1%15%11%12%
December11%10%10%13%

Neighboring states

  • District of Columbia: arrives early October, 2 weeks earlier than Maryland
  • Delaware: arrives early October, 2 weeks earlier than Maryland
  • Virginia: arrives mid September, 4 weeks earlier than Maryland
  • Pennsylvania: arrives late July, 11 weeks earlier than Maryland

Common questions

When do American Herring Gulls arrive in Maryland?
American Herring Gulls are in Maryland all year, but most are here in winter: numbers build from mid October, peak in mid November (13% of checklists), and fall back by the second week of March. In the quietest week (the second week of May) they are still on about 2.7% of checklists.
When do American Herring Gulls leave Maryland?
American Herring Gulls never fully leave Maryland: numbers fall back below half their usual rate by the second week of March, but some are still reported in every week, about 2.7% of checklists at the low.
When is the best time to see a American Herring Gull in Maryland?
The American Herring Gull is reported most often in mid November, on about 13% of Maryland checklists.
Where in Maryland are American Herring Gulls seen most often?
By county, Worcester County, Somerset County, and Queen Anne's County have the highest peak reporting rates for the American Herring Gull (counties with at least 200 checklists).