WhenToBird

Chroicocephalus philadelphia · Laridae

When Do Bonaparte's Gulls Arrive in Indiana?

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

Bonaparte's Gulls are winter birds in Indiana: the first arrive in early October, they are common by the second week of October, peak in the second week of November (6.3% of checklists), and most are gone by early January.

When to look

First arrivalsOct 1-7early October
Common byOct 8-14the second week of October
PeakNov 8-14the second week of November
Most gone byJan 1-7early January

Best: the second week of November. First arrivals early October; most are gone by early January. Peak: on about 6.3% of Indiana checklists.

  1. Januncommon
  2. Febrare
  3. Marcommon
  4. Aprcommon
  5. Mayrare
  6. Junnot usually seen
  7. Julnot usually seen
  8. Augrare
  9. Seprare
  10. Octpeak season
  11. Novpeak season
  12. Deccommon

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

0%2%4%6%8%Jan 1-7: 1.4% of 18123 checklistsJan 8-14: 1.0% of 12006 checklistsJan 15-21: 0.8% of 12403 checklistsJan 22-31: 0.6% of 16181 checklistsFeb 1-7: 0.3% of 12546 checklistsFeb 8-14: 0.4% of 14250 checklistsFeb 15-21: 0.3% of 18077 checklistsFeb 22-28: 0.8% of 13590 checklistsMar 1-7: 1.4% of 14545 checklistsMar 8-14: 2.3% of 14594 checklistsMar 15-21: 3.3% of 13894 checklistsMar 22-31: 3.7% of 22400 checklistsApr 1-7: 3.1% of 18069 checklistsApr 8-14: 2.8% of 19579 checklistsApr 15-21: 1.8% of 19518 checklistsApr 22-30: 0.8% of 30544 checklistsMay 1-7: 0.3% of 28430 checklistsMay 8-14: 0.2% of 30624 checklistsMay 15-21: 0.2% of 22920 checklistsMay 22-31: 0.1% of 21234 checklistsJun 1-7: 0.1% of 12279 checklistsJun 8-14: 0.1% of 10904 checklistsJun 15-21: 0.1% of 9488 checklistsJun 22-30: 0% of 11362 checklistsJul 1-7: 0.1% of 9947 checklistsJul 8-14: 0.1% of 9585 checklistsJul 15-21: 0.1% of 8929 checklistsJul 22-31: 0.4% of 12639 checklistsAug 1-7: 0.3% of 9528 checklistsAug 8-14: 0.4% of 9451 checklistsAug 15-21: 0.7% of 9442 checklistsAug 22-31: 0.9% of 14969 checklistsSep 1-7: 1.0% of 12628 checklistsSep 8-14: 0.8% of 11793 checklistsSep 15-21: 0.4% of 11396 checklistsSep 22-30: 0.7% of 14203 checklistsOct 1-7: 1.3% of 11365 checklistsOct 8-14: 1.5% of 12092 checklistsOct 15-21: 3.1% of 10440 checklistsOct 22-31: 5.9% of 13883 checklistsNov 1-7: 6.6% of 10476 checklistsNov 8-14: 6.2% of 9776 checklistsNov 15-21: 6.0% of 9035 checklistsNov 22-30: 4.7% of 12547 checklistsDec 1-7: 4.2% of 9078 checklistsDec 8-14: 2.8% of 8732 checklistsDec 15-21: 1.8% of 11024 checklistsDec 22-31: 1.2% of 15432 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 Indiana 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 Indiana

Best counties

Share of checklists at the peak
  1. Union CountyBest late October · 149 checklists that week, 4,811 in all68%
  2. Sullivan CountyBest the second week of November · 43 checklists that week, 4,018 in all37%
  3. Franklin CountyBest the second week of November · 68 checklists that week, 3,657 in all36%
  4. Miami CountyBest mid November · 10 checklists that week, 1,203 in all29%
  5. Parke CountyBest mid November · 11 checklists that week, 1,527 in all24%
  6. Gibson CountyBest early November · 156 checklists that week, 10,754 in all21%

Best spots

Share of checklists at the peak
  1. Brookville Recreation AreaUnion County, best mid October · 59 checklists that week, 1,086 in all97%
  2. Brookville LakeUnion County, best late March · 20 checklists that week, 438 in all87%
  3. Vaughn HollowBrown County, best late October · 29 checklists that week, 919 in all79%
  4. Eagle Creek Reservoir (DeLong Creek)Marion County, best the second week of March · 23 checklists that week, 275 in all70%
  5. Eagle Creek Park (Crest Branch)Marion County, best the second week of November · 58 checklists that week, 2,458 in all69%

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

Best time of day

In Indiana, the Bonaparte's Gull is most often listed on checklists started between 2 and 4 pm (1.8% of those checklists).

0%0.5%1%1.5%2%12 am: too few checklists (240) to judge1 am: too few checklists (231) to judge2 am: too few checklists (222) to judge3 am: too few checklists (202) to judge4 am: too few checklists (674) to judge5 am: too few checklists (4329) to judge6 am: 1.3% of 20589 checklists7 am: 1.2% of 58470 checklists8 am: 1.3% of 86931 checklists9 am: 1.6% of 78239 checklists10 am: 1.6% of 66080 checklists11 am: 1.9% of 54904 checklists12 pm: 1.8% of 47610 checklists1 pm: 1.8% of 44814 checklists2 pm: 1.8% of 43790 checklists3 pm: 1.8% of 42983 checklists4 pm: 1.7% of 45349 checklists5 pm: 1.2% of 35993 checklists6 pm: 0.7% of 26447 checklists7 pm: 0.5% of 17740 checklists8 pm: too few checklists (7603) to judge9 pm: too few checklists (1721) to judge10 pm: too few checklists (517) to judge11 pm: too few checklists (272) 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
January1.4%1.0%0.8%0.6%
February0.3%0.4%0.3%0.8%
March1.4%2.3%3.3%3.7%
April3.1%2.8%1.8%0.8%
May0.3%0.2%0.2%0.1%
June0.1%0.1%0.1%0%
July0.1%0.1%0.1%0.4%
August0.3%0.4%0.7%0.9%
September1.0%0.8%0.4%0.7%
October1.3%1.5%3.1%5.9%
November6.6%6.2%6.0%4.7%
December4.2%2.8%1.8%1.2%

Neighboring states

  • Illinois: arrives early October, in the same week than Indiana
  • Kentucky: arrives late October, 3 weeks later than Indiana
  • Ohio: arrives early August, 8 weeks earlier than Indiana
  • Michigan: arrives late July, 9 weeks earlier than Indiana

Common questions

When do Bonaparte's Gulls arrive in Indiana?
Bonaparte's Gulls are winter birds in Indiana: the first arrive in early October, they are common by the second week of October, peak in the second week of November (6.3% of checklists), and most are gone by early January.
When do Bonaparte's Gulls leave Indiana?
Most Bonaparte's Gulls have left Indiana by early January, when reports fall below half their usual rate. Stragglers are still reported until the second week of January.
When is the best time to see a Bonaparte's Gull in Indiana?
The Bonaparte's Gull is reported most often in the second week of November, on about 6.3% of Indiana checklists.
Where in Indiana are Bonaparte's Gulls seen most often?
By county, Union County, Sullivan County, and Franklin County have the highest peak reporting rates for the Bonaparte's Gull (counties with at least 200 checklists).