WhenToBird

Quiscalus major · Icteridae

When Do Boat-tailed Grackles Arrive in Connecticut?

Adult female Boat-tailed Grackle
Photo: Josiah Londerée, CC BY 4.0 via iNaturalist

Boat-tailed Grackles arrive in Connecticut in the second week of March, peak in late May (1.2% of checklists), and most are gone by the second week of August.

When to look

First arrivalsMar 8-14the second week of March
Common byMar 8-14the second week of March
PeakMay 22-31late May
Most gone byAug 8-14the second week of August

Best: late May. First arrivals the second week of March; most are gone by the second week of August. Peak: on about 1.2% of Connecticut checklists.

  1. Janrare
  2. Febrare
  3. Marcommon
  4. Aprpeak season
  5. Maypeak season
  6. Junpeak season
  7. Julcommon
  8. Augcommon
  9. Seprare
  10. Octnot usually seen
  11. Novnot usually seen
  12. Decnot usually seen

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

0%0.5%1%1.5%Jan 1-7: 0% of 18950 checklistsJan 8-14: 0.1% of 13676 checklistsJan 15-21: 0.1% of 13377 checklistsJan 22-31: 0.1% of 17004 checklistsFeb 1-7: 0.1% of 10218 checklistsFeb 8-14: 0.1% of 11568 checklistsFeb 15-21: 0.1% of 15916 checklistsFeb 22-28: 0.1% of 11413 checklistsMar 1-7: 0.2% of 10754 checklistsMar 8-14: 0.4% of 12051 checklistsMar 15-21: 0.5% of 12616 checklistsMar 22-31: 0.6% of 17801 checklistsApr 1-7: 0.7% of 13186 checklistsApr 8-14: 1.4% of 14428 checklistsApr 15-21: 1.2% of 14738 checklistsApr 22-30: 0.8% of 21753 checklistsMay 1-7: 0.8% of 22494 checklistsMay 8-14: 0.8% of 23363 checklistsMay 15-21: 1.2% of 20219 checklistsMay 22-31: 1.1% of 20778 checklistsJun 1-7: 1.1% of 12234 checklistsJun 8-14: 0.8% of 12491 checklistsJun 15-21: 0.8% of 10856 checklistsJun 22-30: 0.6% of 11964 checklistsJul 1-7: 0.7% of 9437 checklistsJul 8-14: 0.8% of 8599 checklistsJul 15-21: 0.5% of 8252 checklistsJul 22-31: 0.8% of 11329 checklistsAug 1-7: 0.8% of 8116 checklistsAug 8-14: 0.3% of 8051 checklistsAug 15-21: 0.1% of 8502 checklistsAug 22-31: 0.1% of 13673 checklistsSep 1-7: 0.1% of 9873 checklistsSep 8-14: 0.1% of 9735 checklistsSep 15-21: 0.1% of 10120 checklistsSep 22-30: 0.1% of 12543 checklistsOct 1-7: 0.1% of 10735 checklistsOct 8-14: 0% of 10869 checklistsOct 15-21: 0% of 10436 checklistsOct 22-31: 0.1% of 13808 checklistsNov 1-7: 0.1% of 10507 checklistsNov 8-14: 0% of 9827 checklistsNov 15-21: 0.1% of 9904 checklistsNov 22-30: 0.1% of 13396 checklistsDec 1-7: 0.1% of 8974 checklistsDec 8-14: 0.1% of 9468 checklistsDec 15-21: 0% of 11614 checklistsDec 22-31: 0.1% of 16616 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 Connecticut 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 Connecticut

Best counties

Share of checklists at the peak
  1. Fairfield CountyBest mid April · 3190 checklists that week, 139,848 in all3.7%
  2. New Haven CountyBest mid May · 4626 checklists that week, 139,721 in all1.6%
  3. Middlesex CountyBest the second week of April · 1130 checklists that week, 39,919 in all1.0%
  4. New London CountyBest the second week of June · 1033 checklists that week, 65,205 in all0.3%

Best spots

Share of checklists at the peak
  1. Stewart B. Mckinney National Wildlife RefugeFairfield County, best the second week of June · 59 checklists that week, 3,086 in all87%
  2. Stewart B. Mckinney National Wildlife Refuge (Lewis Gut)Fairfield County, best early May · 49 checklists that week, 1,029 in all56%
  3. Great MeadowsFairfield County, best the second week of June · 20 checklists that week, 3,190 in all23%
  4. Griswold CoveNew London County, best the second week of June · 20 checklists that week, 896 in all18%
  5. Hammonasset Natural Area Preserve (Dardanells)New Haven County, best late May · 40 checklists that week, 611 in all17%
  6. Hammonasset Natural Area PreserveNew Haven County, best mid May · 357 checklists that week, 10,098 in all15%

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

Best time of day

In Connecticut, the Boat-tailed Grackle is most often listed on checklists started between 10 am and 12 pm (0.6% of those checklists).

0%0.5%1%12 am: too few checklists (325) to judge1 am: too few checklists (367) to judge2 am: too few checklists (488) to judge3 am: too few checklists (792) to judge4 am: too few checklists (2722) to judge5 am: too few checklists (9489) to judge6 am: 0.1% of 33657 checklists7 am: 0.3% of 62964 checklists8 am: 0.5% of 70645 checklists9 am: 0.5% of 64870 checklists10 am: 0.6% of 58827 checklists11 am: 0.6% of 51689 checklists12 pm: 0.5% of 45288 checklists1 pm: 0.4% of 44765 checklists2 pm: 0.4% of 44173 checklists3 pm: 0.3% of 41979 checklists4 pm: 0.4% of 33219 checklists5 pm: 0.4% of 24828 checklists6 pm: 0.4% of 15856 checklists7 pm: too few checklists (8126) to judge8 pm: too few checklists (1994) to judge9 pm: too few checklists (533) to judge10 pm: too few checklists (349) to judge11 pm: too few checklists (286) 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
January0%0.1%0.1%0.1%
February0.1%0.1%0.1%0.1%
March0.2%0.4%0.5%0.6%
April0.7%1.4%1.2%0.8%
May0.8%0.8%1.2%1.1%
June1.1%0.8%0.8%0.6%
July0.7%0.8%0.5%0.8%
August0.8%0.3%0.1%0.1%
September0.1%0.1%0.1%0.1%
October0.1%0%0%0.1%
November0.1%0%0.1%0.1%
December0.1%0.1%0%0.1%

Neighboring states

  • New Jersey: arrives the second week of December, 12 weeks earlier than Connecticut
  • New York: arrives mid March, 1 week later than Connecticut
  • Delaware: arrives mid September, 23 weeks earlier than Connecticut
  • Maryland: arrives early March, 1 week earlier than Connecticut

Common questions

When do Boat-tailed Grackles arrive in Connecticut?
Boat-tailed Grackles arrive in Connecticut in the second week of March, peak in late May (1.2% of checklists), and most are gone by the second week of August.
When do Boat-tailed Grackles leave Connecticut?
Most Boat-tailed Grackles have left Connecticut by the second week of August, when reports fall below half their usual rate.
When is the best time to see a Boat-tailed Grackle in Connecticut?
The Boat-tailed Grackle is reported most often in late May, on about 1.2% of Connecticut checklists.
Where in Connecticut are Boat-tailed Grackles seen most often?
By county, Fairfield County, New Haven County, and Middlesex County have the highest peak reporting rates for the Boat-tailed Grackle (counties with at least 200 checklists).