WhenToBird

Larus delawarensis · Laridae

When Do Ring-billed Gulls Arrive in Wisconsin?

Adult Ring-billed Gull
Photo: Isaac Krone, CC BY 4.0 via iNaturalist

Ring-billed Gulls are in Wisconsin all year, but most are here in fall: numbers build from late July, peak in early November (27% of checklists), and fall back by early December. In the quietest week (early February) they are still on about 2.6% of checklists.

When to look

Numbers buildJul 22-31late July
PeakNov 1-7early November
Fall back byDec 1-7early December
FewestFeb 1-7early February

Best: early November. Here all year; numbers build from late July and fall back by early December. Peak: on about 27% of Wisconsin checklists.

  1. Januncommon
  2. Febuncommon
  3. Marpeak season
  4. Aprpeak season
  5. Maycommon
  6. Juncommon
  7. Julcommon
  8. Augpeak season
  9. Seppeak season
  10. Octpeak season
  11. Novpeak season
  12. Deccommon

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

0%10%20%30%Jan 1-7: 7.5% of 27925 checklistsJan 8-14: 5.1% of 18337 checklistsJan 15-21: 3.7% of 17370 checklistsJan 22-31: 2.6% of 23777 checklistsFeb 1-7: 2.6% of 16656 checklistsFeb 8-14: 2.5% of 18286 checklistsFeb 15-21: 2.9% of 24739 checklistsFeb 22-28: 6.4% of 20113 checklistsMar 1-7: 13% of 24024 checklistsMar 8-14: 19% of 26722 checklistsMar 15-21: 24% of 27238 checklistsMar 22-31: 24% of 40171 checklistsApr 1-7: 23% of 34961 checklistsApr 8-14: 21% of 39128 checklistsApr 15-21: 20% of 38887 checklistsApr 22-30: 19% of 57231 checklistsMay 1-7: 16% of 55115 checklistsMay 8-14: 14% of 63098 checklistsMay 15-21: 14% of 49821 checklistsMay 22-31: 14% of 56796 checklistsJun 1-7: 11% of 33621 checklistsJun 8-14: 9.6% of 31282 checklistsJun 15-21: 8.9% of 30186 checklistsJun 22-30: 8.3% of 35128 checklistsJul 1-7: 8.5% of 27088 checklistsJul 8-14: 10% of 23293 checklistsJul 15-21: 12% of 20933 checklistsJul 22-31: 16% of 27595 checklistsAug 1-7: 17% of 19147 checklistsAug 8-14: 19% of 18286 checklistsAug 15-21: 20% of 19195 checklistsAug 22-31: 21% of 28229 checklistsSep 1-7: 21% of 22408 checklistsSep 8-14: 20% of 20857 checklistsSep 15-21: 23% of 20707 checklistsSep 22-30: 22% of 26469 checklistsOct 1-7: 22% of 21069 checklistsOct 8-14: 23% of 21011 checklistsOct 15-21: 25% of 20006 checklistsOct 22-31: 26% of 26362 checklistsNov 1-7: 28% of 18928 checklistsNov 8-14: 26% of 17052 checklistsNov 15-21: 25% of 16291 checklistsNov 22-30: 23% of 20564 checklistsDec 1-7: 17% of 15354 checklistsDec 8-14: 14% of 16294 checklistsDec 15-21: 9.8% of 21430 checklistsDec 22-31: 7.5% of 26314 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 Wisconsin 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.

Embed this map on your site

Where in Wisconsin

Best counties

Share of checklists at the peak
  1. Douglas CountyBest mid September · 816 checklists that week, 14,015 in all70%
  2. Ashland CountyBest late October · 464 checklists that week, 16,576 in all60%
  3. Kewaunee CountyBest early November · 221 checklists that week, 9,747 in all57%
  4. Sheboygan CountyBest the second week of November · 395 checklists that week, 25,419 in all48%
  5. Pepin CountyBest late September · 12 checklists that week, 929 in all43%
  6. Shawano CountyBest late October · 44 checklists that week, 3,900 in all42%

Best spots

Share of checklists at the peak
  1. North Point ParkSheboygan County, best late June · 56 checklists that week, 1,755 in all100%
  2. Lake WisconsinSauk County, best the second week of November · 23 checklists that week, 1,455 in all100%
  3. North Beach ParkRacine County, best the second week of September · 28 checklists that week, 490 in all100%
  4. Maslowski ParkAshland County, best the second week of August · 24 checklists that week, 1,232 in all99%

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

Best time of day

In Wisconsin, the Ring-billed Gull is most often listed on checklists started between 4 and 6 pm (17% of those checklists).

0%5%10%15%20%12 am: too few checklists (993) to judge1 am: too few checklists (844) to judge2 am: too few checklists (839) to judge3 am: too few checklists (1488) to judge4 am: too few checklists (5344) to judge5 am: 11% of 27016 checklists6 am: 16% of 83973 checklists7 am: 15% of 160717 checklists8 am: 15% of 160531 checklists9 am: 16% of 136968 checklists10 am: 16% of 119110 checklists11 am: 16% of 99116 checklists12 pm: 16% of 85078 checklists1 pm: 17% of 80688 checklists2 pm: 17% of 79140 checklists3 pm: 17% of 78599 checklists4 pm: 17% of 69767 checklists5 pm: 17% of 53229 checklists6 pm: 16% of 38769 checklists7 pm: too few checklists (24396) to judge8 pm: too few checklists (10155) to judge9 pm: too few checklists (4990) to judge10 pm: too few checklists (2463) to judge11 pm: too few checklists (1281) 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
January7.5%5.1%3.7%2.6%
February2.6%2.5%2.9%6.4%
March13%19%24%24%
April23%21%20%19%
May16%14%14%14%
June11%9.6%8.9%8.3%
July8.5%10%12%16%
August17%19%20%21%
September21%20%23%22%
October22%23%25%26%
November28%26%25%23%
December17%14%9.8%7.5%

Neighboring states

  • Illinois: year-round, peaks the second week of March
  • Iowa: arrives early July, 3 weeks earlier than Wisconsin
  • Michigan: arrives the second week of July, 2 weeks earlier than Wisconsin
  • Minnesota: arrives late February, 20 weeks earlier than Wisconsin

Common questions

When do Ring-billed Gulls arrive in Wisconsin?
Ring-billed Gulls are in Wisconsin all year, but most are here in fall: numbers build from late July, peak in early November (27% of checklists), and fall back by early December. In the quietest week (early February) they are still on about 2.6% of checklists.
When do Ring-billed Gulls leave Wisconsin?
Ring-billed Gulls never fully leave Wisconsin: numbers fall back below half their usual rate by early December, but some are still reported in every week, about 2.6% of checklists at the low.
When is the best time to see a Ring-billed Gull in Wisconsin?
The Ring-billed Gull is reported most often in early November, on about 27% of Wisconsin checklists.
Where in Wisconsin are Ring-billed Gulls seen most often?
By county, Douglas County, Ashland County, and Kewaunee County have the highest peak reporting rates for the Ring-billed Gull (counties with at least 200 checklists).