WhenToBird

Quiscalus mexicanus · Icteridae

When Do Great-tailed Grackles Arrive in Louisiana?

Adult female Great-tailed Grackle
Photo: Anthony Batista, CC BY 4.0 via iNaturalist

Great-tailed Grackles reach Louisiana in mid January, are common by late February, peak in late April (7.4% of checklists), and most are gone by the second week of November.

When to look

First arrivalsJan 15-21mid January
Common byFeb 22-28late February
PeakApr 22-30late April
Most gone byNov 8-14the second week of November

Best: late April. First arrivals mid January; most are gone by the second week of November. Peak: on about 7.4% of Louisiana checklists.

  1. Januncommon
  2. Febuncommon
  3. Marcommon
  4. Aprpeak season
  5. Maypeak season
  6. Juncommon
  7. Juluncommon
  8. Auguncommon
  9. Sepuncommon
  10. Octcommon
  11. Novcommon
  12. Decuncommon

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

0%5%10%Jan 1-7: 1.7% of 8384 checklistsJan 8-14: 1.4% of 6265 checklistsJan 15-21: 1.4% of 6825 checklistsJan 22-31: 1.9% of 8776 checklistsFeb 1-7: 2.4% of 5956 checklistsFeb 8-14: 1.7% of 6291 checklistsFeb 15-21: 1.6% of 8044 checklistsFeb 22-28: 2.8% of 5946 checklistsMar 1-7: 2.7% of 5981 checklistsMar 8-14: 3.2% of 6307 checklistsMar 15-21: 3.0% of 6747 checklistsMar 22-31: 3.5% of 10487 checklistsApr 1-7: 4.2% of 8037 checklistsApr 8-14: 5.0% of 9577 checklistsApr 15-21: 6.3% of 11372 checklistsApr 22-30: 8.6% of 14344 checklistsMay 1-7: 6.7% of 8193 checklistsMay 8-14: 5.0% of 6823 checklistsMay 15-21: 4.6% of 4818 checklistsMay 22-31: 3.4% of 6206 checklistsJun 1-7: 3.0% of 3660 checklistsJun 8-14: 3.0% of 3455 checklistsJun 15-21: 4.0% of 3084 checklistsJun 22-30: 2.8% of 3904 checklistsJul 1-7: 3.1% of 3240 checklistsJul 8-14: 2.6% of 3235 checklistsJul 15-21: 2.7% of 3167 checklistsJul 22-31: 1.6% of 4328 checklistsAug 1-7: 1.8% of 3192 checklistsAug 8-14: 1.6% of 3394 checklistsAug 15-21: 1.5% of 3502 checklistsAug 22-31: 2.0% of 5658 checklistsSep 1-7: 2.2% of 4366 checklistsSep 8-14: 1.9% of 4648 checklistsSep 15-21: 1.2% of 4369 checklistsSep 22-30: 1.7% of 6418 checklistsOct 1-7: 2.1% of 5375 checklistsOct 8-14: 2.6% of 6213 checklistsOct 15-21: 2.0% of 5553 checklistsOct 22-31: 6.1% of 8879 checklistsNov 1-7: 4.2% of 6231 checklistsNov 8-14: 1.5% of 5011 checklistsNov 15-21: 1.4% of 4856 checklistsNov 22-30: 2.1% of 6696 checklistsDec 1-7: 1.3% of 4530 checklistsDec 8-14: 1.5% of 4883 checklistsDec 15-21: 2.0% of 5833 checklistsDec 22-31: 1.1% of 9940 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 Louisiana 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 Louisiana

Best counties

Share of checklists at the peak
  1. Acadia ParishBest late May · 87 checklists that week, 4,718 in all43%
  2. Cameron ParishBest early June · 59 checklists that week, 17,943 in all43%
  3. Jefferson Davis ParishBest late May · 29 checklists that week, 2,828 in all35%
  4. Calcasieu ParishBest late May · 212 checklists that week, 10,558 in all24%
  5. Iberia ParishBest late June · 19 checklists that week, 1,313 in all23%
  6. Pointe Coupee ParishBest late September · 10 checklists that week, 593 in all23%

Best spots

Share of checklists at the peak
  1. State Lands (southwest)Cameron Parish, best late April · 27 checklists that week, 129 in all56%
  2. Illinois Plant (2)Jefferson Davis Parish, best late November · 20 checklists that week, 218 in all49%

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

Best time of day

In Louisiana, the Great-tailed Grackle is most often listed on checklists started between 1 and 3 pm (3.9% of those checklists).

0%1%2%3%4%12 am: too few checklists (110) to judge1 am: too few checklists (95) to judge2 am: too few checklists (78) to judge3 am: too few checklists (145) to judge4 am: too few checklists (266) to judge5 am: too few checklists (2981) to judge6 am: 1.7% of 21115 checklists7 am: 3.5% of 38843 checklists8 am: 3.3% of 36306 checklists9 am: 3.2% of 31934 checklists10 am: 3.4% of 27208 checklists11 am: 3.6% of 20733 checklists12 pm: 3.6% of 18505 checklists1 pm: 3.8% of 17383 checklists2 pm: 3.9% of 17422 checklists3 pm: 3.5% of 17005 checklists4 pm: 2.9% of 17170 checklists5 pm: 2.7% of 12536 checklists6 pm: 2.2% of 8080 checklists7 pm: too few checklists (3798) to judge8 pm: too few checklists (676) to judge9 pm: too few checklists (311) to judge10 pm: too few checklists (206) to judge11 pm: too few checklists (93) 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
January1.7%1.4%1.4%1.9%
February2.4%1.7%1.6%2.8%
March2.7%3.2%3.0%3.5%
April4.2%5.0%6.3%8.6%
May6.7%5.0%4.6%3.4%
June3.0%3.0%4.0%2.8%
July3.1%2.6%2.7%1.6%
August1.8%1.6%1.5%2.0%
September2.2%1.9%1.2%1.7%
October2.1%2.6%2.0%6.1%
November4.2%1.5%1.4%2.1%
December1.3%1.5%2.0%1.1%

Neighboring states

  • Texas: year-round, peaks mid April
  • Oklahoma: arrives mid March, 8 weeks later than Louisiana
  • Kansas: arrives early March, 6 weeks later than Louisiana
  • Iowa: arrives the second week of March, 7 weeks later than Louisiana

Common questions

When do Great-tailed Grackles arrive in Louisiana?
Great-tailed Grackles reach Louisiana in mid January, are common by late February, peak in late April (7.4% of checklists), and most are gone by the second week of November.
When do Great-tailed Grackles leave Louisiana?
Most Great-tailed Grackles have left Louisiana by the second week of November, when reports fall below half their usual rate. Stragglers are still reported until the second week of December.
When is the best time to see a Great-tailed Grackle in Louisiana?
The Great-tailed Grackle is reported most often in late April, on about 7.4% of Louisiana checklists.
Where in Louisiana are Great-tailed Grackles seen most often?
By county, Acadia Parish, Cameron Parish, and Jefferson Davis Parish have the highest peak reporting rates for the Great-tailed Grackle (counties with at least 200 checklists).