WhenToBird

Chroicocephalus philadelphia · Laridae

When Do Bonaparte's Gulls Arrive in Virginia?

Adult Bonaparte's Gull
Photo: Kevin Krebs, CC BY 4.0 via iNaturalist

Bonaparte's Gulls arrive in Virginia in early November, peak in early April (2.7% of checklists), and most are gone by mid April.

When to look

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

Best: early April. First arrivals early November; most are gone by mid April. Peak: on about 2.7% of Virginia checklists.

  1. Jancommon
  2. Febcommon
  3. Marpeak season
  4. Aprpeak season
  5. Mayuncommon
  6. Junnot usually seen
  7. Julnot usually seen
  8. Augnot usually seen
  9. Sepnot usually seen
  10. Octuncommon
  11. Novcommon
  12. Deccommon

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

0%1%2%3%4%Jan 1-7: 1.8% of 32817 checklistsJan 8-14: 1.9% of 25111 checklistsJan 15-21: 2.3% of 25510 checklistsJan 22-31: 1.8% of 34492 checklistsFeb 1-7: 1.8% of 24950 checklistsFeb 8-14: 1.3% of 28224 checklistsFeb 15-21: 0.8% of 43578 checklistsFeb 22-28: 1.3% of 26467 checklistsMar 1-7: 1.4% of 25851 checklistsMar 8-14: 1.2% of 25901 checklistsMar 15-21: 1.7% of 26747 checklistsMar 22-31: 2.6% of 40819 checklistsApr 1-7: 3.3% of 31351 checklistsApr 8-14: 2.2% of 33239 checklistsApr 15-21: 1.2% of 37284 checklistsApr 22-30: 0.5% of 54364 checklistsMay 1-7: 0.4% of 47698 checklistsMay 8-14: 0.3% of 46174 checklistsMay 15-21: 0.2% of 36444 checklistsMay 22-31: 0.1% of 43203 checklistsJun 1-7: 0.1% of 28503 checklistsJun 8-14: 0.1% of 25485 checklistsJun 15-21: 0.1% of 23728 checklistsJun 22-30: 0% of 28785 checklistsJul 1-7: 0.1% of 22294 checklistsJul 8-14: 0.1% of 20481 checklistsJul 15-21: 0% of 18914 checklistsJul 22-31: 0.1% of 26976 checklistsAug 1-7: 0.1% of 19555 checklistsAug 8-14: 0.1% of 18744 checklistsAug 15-21: 0.1% of 18721 checklistsAug 22-31: 0.1% of 28763 checklistsSep 1-7: 0.1% of 23594 checklistsSep 8-14: 0.1% of 22581 checklistsSep 15-21: 0.1% of 23036 checklistsSep 22-30: 0.1% of 29687 checklistsOct 1-7: 0.1% of 24321 checklistsOct 8-14: 0.1% of 23946 checklistsOct 15-21: 0.2% of 22191 checklistsOct 22-31: 0.4% of 30161 checklistsNov 1-7: 0.9% of 21431 checklistsNov 8-14: 1.8% of 22758 checklistsNov 15-21: 1.6% of 19988 checklistsNov 22-30: 1.4% of 27665 checklistsDec 1-7: 1.1% of 19324 checklistsDec 8-14: 1.4% of 20316 checklistsDec 15-21: 1.5% of 25675 checklistsDec 22-31: 1.7% of 38677 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 Virginia 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 Virginia

Best counties

Share of checklists at the peak
  1. Mecklenburg CountyBest early December · 55 checklists that week, 8,544 in all26%
  2. Mathews CountyBest late January · 76 checklists that week, 3,594 in all20%
  3. Surry CountyBest the second week of December · 19 checklists that week, 2,669 in all19%
  4. Pulaski CountyBest early April · 137 checklists that week, 6,305 in all13%
  5. Northumberland CountyBest late March · 107 checklists that week, 4,172 in all13%
  6. Virginia Beach CountyBest mid January · 2005 checklists that week, 70,485 in all12%

Best spots

Share of checklists at the peak
  1. John H. Kerr Reservoir (southeast)Mecklenburg County, best early January · 26 checklists that week, 310 in all71%
  2. John H. Kerr ReservoirMecklenburg County, best late March · 21 checklists that week, 612 in all67%
  3. Cape Charles State Natural Area PreserveNorthampton County, best late November · 40 checklists that week, 725 in all58%
  4. Bethel Beach State Natural Area PreserveMathews County, best late March · 20 checklists that week, 931 in all56%
  5. Lake HolidayFrederick County, best early April · 20 checklists that week, 397 in all54%
  6. Burke Lake and Golf CourseFairfax County, best early April · 121 checklists that week, 2,171 in all53%

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

Best time of day

In Virginia, the Bonaparte's Gull is most often listed on checklists started between 12 and 2 pm (1.1% of those checklists).

0%0.5%1%1.5%12 am: too few checklists (485) to judge1 am: too few checklists (488) to judge2 am: too few checklists (423) to judge3 am: too few checklists (565) to judge4 am: too few checklists (1410) to judge5 am: too few checklists (10265) to judge6 am: 1.0% of 64788 checklists7 am: 0.9% of 169128 checklists8 am: 0.8% of 180748 checklists9 am: 0.9% of 153462 checklists10 am: 1.0% of 128966 checklists11 am: 1.1% of 104204 checklists12 pm: 1.1% of 91604 checklists1 pm: 1.1% of 85547 checklists2 pm: 1.0% of 82355 checklists3 pm: 0.9% of 82265 checklists4 pm: 0.7% of 76714 checklists5 pm: 0.5% of 56782 checklists6 pm: 0.4% of 40131 checklists7 pm: too few checklists (24290) to judge8 pm: too few checklists (7744) to judge9 pm: too few checklists (2383) to judge10 pm: too few checklists (1122) to judge11 pm: too few checklists (651) 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
January1.8%1.9%2.3%1.8%
February1.8%1.3%0.8%1.3%
March1.4%1.2%1.7%2.6%
April3.3%2.2%1.2%0.5%
May0.4%0.3%0.2%0.1%
June0.1%0.1%0.1%0%
July0.1%0.1%0%0.1%
August0.1%0.1%0.1%0.1%
September0.1%0.1%0.1%0.1%
October0.1%0.1%0.2%0.4%
November0.9%1.8%1.6%1.4%
December1.1%1.4%1.5%1.7%

Neighboring states

  • District of Columbia: arrives mid March, 18 weeks later than Virginia
  • Maryland: arrives late October, 1 week earlier than Virginia
  • West Virginia: arrives the second week of March, 17 weeks later than Virginia
  • Delaware: arrives early November, in the same week than Virginia

Common questions

When do Bonaparte's Gulls arrive in Virginia?
Bonaparte's Gulls arrive in Virginia in early November, peak in early April (2.7% of checklists), and most are gone by mid April.
When do Bonaparte's Gulls leave Virginia?
Most Bonaparte's Gulls have left Virginia by mid April, when reports fall below half their usual rate.
When is the best time to see a Bonaparte's Gull in Virginia?
The Bonaparte's Gull is reported most often in early April, on about 2.7% of Virginia checklists.
Where in Virginia are Bonaparte's Gulls seen most often?
By county, Mecklenburg County, Mathews County, and Surry County have the highest peak reporting rates for the Bonaparte's Gull (counties with at least 200 checklists).