WhenToBird

Chroicocephalus philadelphia · Laridae

When Do Bonaparte's Gulls Arrive in Kentucky?

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

Bonaparte's Gulls are winter birds in Kentucky: they arrive in late October, peak in late November (5.4% of checklists), and most are gone by the second week of April.

When to look

First arrivalsOct 22-31late October
Common byOct 22-31late October
PeakNov 22-30late November
Most gone byApr 8-14the second week of April

Best: late November. First arrivals late October; most are gone by the second week of April. Peak: on about 5.4% of Kentucky checklists.

  1. Jancommon
  2. Febuncommon
  3. Marcommon
  4. Aprcommon
  5. Maynot usually seen
  6. Junnot usually seen
  7. Julnot usually seen
  8. Augnot usually seen
  9. Sepnot usually seen
  10. Octuncommon
  11. Novpeak season
  12. Decpeak season

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

0%2%4%6%Jan 1-7: 2.7% of 6923 checklistsJan 8-14: 2.3% of 4900 checklistsJan 15-21: 2.3% of 5016 checklistsJan 22-31: 2.1% of 6611 checklistsFeb 1-7: 2.2% of 4986 checklistsFeb 8-14: 1.8% of 5677 checklistsFeb 15-21: 1.8% of 8880 checklistsFeb 22-28: 2.8% of 5567 checklistsMar 1-7: 2.0% of 5397 checklistsMar 8-14: 2.5% of 5462 checklistsMar 15-21: 3.2% of 5733 checklistsMar 22-31: 4.2% of 9043 checklistsApr 1-7: 2.4% of 6763 checklistsApr 8-14: 1.6% of 7498 checklistsApr 15-21: 0.6% of 8486 checklistsApr 22-30: 0.3% of 13396 checklistsMay 1-7: 0.1% of 10825 checklistsMay 8-14: 0.1% of 11495 checklistsMay 15-21: 0% of 7363 checklistsMay 22-31: 0% of 8800 checklistsJun 1-7: 0% of 5381 checklistsJun 8-14: 0% of 5244 checklistsJun 15-21: 0% of 4730 checklistsJun 22-30: 0% of 5470 checklistsJul 1-7: 0% of 4567 checklistsJul 8-14: 0% of 4287 checklistsJul 15-21: 0% of 4097 checklistsJul 22-31: 0% of 6044 checklistsAug 1-7: 0.1% of 4647 checklistsAug 8-14: 0% of 4256 checklistsAug 15-21: 0% of 4484 checklistsAug 22-31: 0.1% of 6434 checklistsSep 1-7: 0% of 5450 checklistsSep 8-14: 0% of 5157 checklistsSep 15-21: 0% of 5530 checklistsSep 22-30: 0.1% of 6710 checklistsOct 1-7: 0% of 5403 checklistsOct 8-14: 0.2% of 5943 checklistsOct 15-21: 0.5% of 4873 checklistsOct 22-31: 1.6% of 6584 checklistsNov 1-7: 3.4% of 5008 checklistsNov 8-14: 5.2% of 4677 checklistsNov 15-21: 5.0% of 4419 checklistsNov 22-30: 5.6% of 5933 checklistsDec 1-7: 5.5% of 4479 checklistsDec 8-14: 4.3% of 4687 checklistsDec 15-21: 2.9% of 6239 checklistsDec 22-31: 2.9% of 7976 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 Kentucky 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 Kentucky

Best counties

Share of checklists at the peak
  1. Adair CountyBest the second week of November · 36 checklists that week, 903 in all52%
  2. Lyon CountyBest early December · 24 checklists that week, 2,125 in all51%
  3. Hancock CountyBest early December · 14 checklists that week, 230 in all50%
  4. Russell CountyBest mid February · 39 checklists that week, 1,208 in all49%
  5. Taylor CountyBest early December · 20 checklists that week, 740 in all46%
  6. Marshall CountyBest the second week of December · 135 checklists that week, 7,392 in all44%

Best spots

Share of checklists at the peak
  1. Kentucky ReservoirMarshall County, best early January · 22 checklists that week, 444 in all91%
  2. Barren River Lake State Resort ParkBarren County, best early November · 41 checklists that week, 306 in all74%
  3. Cumberland Recreation Area (southeast)Pulaski County, best early December · 24 checklists that week, 413 in all63%
  4. Cumberland Recreation AreaPulaski County, best the second week of November · 20 checklists that week, 427 in all62%
  5. Barkley Recreation AreaLyon County, best mid February · 20 checklists that week, 390 in all58%
  6. Swallow Spring PondChristian County, best late March · 26 checklists that week, 216 in all51%

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

Best time of day

In Kentucky, the Bonaparte's Gull is most often listed on checklists started between 1 and 3 pm (2.5% of those checklists).

0%1%2%3%12 am: too few checklists (140) to judge1 am: too few checklists (120) to judge2 am: too few checklists (88) to judge3 am: too few checklists (95) to judge4 am: too few checklists (151) to judge5 am: too few checklists (1289) to judge6 am: 1.0% of 8227 checklists7 am: 0.7% of 24608 checklists8 am: 0.8% of 36577 checklists9 am: 1.2% of 34626 checklists10 am: 1.8% of 28796 checklists11 am: 2.1% of 22781 checklists12 pm: 2.3% of 19848 checklists1 pm: 2.5% of 19369 checklists2 pm: 2.6% of 19367 checklists3 pm: 2.2% of 19618 checklists4 pm: 1.2% of 19464 checklists5 pm: 0.6% of 16639 checklists6 pm: 0.4% of 12714 checklists7 pm: 0.2% of 8457 checklists8 pm: too few checklists (3447) to judge9 pm: too few checklists (684) to judge10 pm: too few checklists (267) to judge11 pm: too few checklists (158) 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
January2.7%2.3%2.3%2.1%
February2.2%1.8%1.8%2.8%
March2.0%2.5%3.2%4.2%
April2.4%1.6%0.6%0.3%
May0.1%0.1%0%0%
June0%0%0%0%
July0%0%0%0%
August0.1%0%0%0.1%
September0%0%0%0.1%
October0%0.2%0.5%1.6%
November3.4%5.2%5.0%5.6%
December5.5%4.3%2.9%2.9%

Neighboring states

  • Tennessee: arrives late October, in the same week than Kentucky
  • Indiana: arrives early October, 3 weeks earlier than Kentucky
  • Ohio: arrives early August, 11 weeks earlier than Kentucky
  • Illinois: arrives early October, 3 weeks earlier than Kentucky

Common questions

When do Bonaparte's Gulls arrive in Kentucky?
Bonaparte's Gulls are winter birds in Kentucky: they arrive in late October, peak in late November (5.4% of checklists), and most are gone by the second week of April.
When do Bonaparte's Gulls leave Kentucky?
Most Bonaparte's Gulls have left Kentucky by the second week of April, when reports fall below half their usual rate.
When is the best time to see a Bonaparte's Gull in Kentucky?
The Bonaparte's Gull is reported most often in late November, on about 5.4% of Kentucky checklists.
Where in Kentucky are Bonaparte's Gulls seen most often?
By county, Adair County, Lyon County, and Hancock County have the highest peak reporting rates for the Bonaparte's Gull (counties with at least 200 checklists).