WhenToBird

Quiscalus mexicanus · Icteridae

When Do Great-tailed Grackles Arrive in Oklahoma?

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

Great-tailed Grackles are in Oklahoma all year, but most are here in spring: numbers build from mid March, peak in late May (13% of checklists), and fall back by late July. In the quietest week (mid December) they are still on about 3.1% of checklists.

When to look

Numbers buildMar 15-21mid March
PeakMay 22-31late May
Fall back byJul 22-31late July
FewestDec 15-21mid December

Best: late May. Here all year; numbers build from mid March and fall back by late July. Peak: on about 13% of Oklahoma checklists.

  1. Januncommon
  2. Febuncommon
  3. Marpeak season
  4. Aprpeak season
  5. Maypeak season
  6. Junpeak season
  7. Julpeak season
  8. Augcommon
  9. Sepcommon
  10. Octcommon
  11. Novcommon
  12. Decuncommon

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

0%5%10%15%Jan 1-7: 4.1% of 6087 checklistsJan 8-14: 4.7% of 4350 checklistsJan 15-21: 3.3% of 4381 checklistsJan 22-31: 3.2% of 6165 checklistsFeb 1-7: 4.1% of 4259 checklistsFeb 8-14: 3.0% of 4589 checklistsFeb 15-21: 2.9% of 7001 checklistsFeb 22-28: 4.9% of 4482 checklistsMar 1-7: 5.9% of 4724 checklistsMar 8-14: 8.8% of 4571 checklistsMar 15-21: 9.0% of 4393 checklistsMar 22-31: 11% of 7544 checklistsApr 1-7: 11% of 5967 checklistsApr 8-14: 10% of 6543 checklistsApr 15-21: 11% of 7366 checklistsApr 22-30: 12% of 10618 checklistsMay 1-7: 12% of 8835 checklistsMay 8-14: 12% of 8247 checklistsMay 15-21: 14% of 6081 checklistsMay 22-31: 14% of 7283 checklistsJun 1-7: 12% of 4256 checklistsJun 8-14: 12% of 3774 checklistsJun 15-21: 12% of 3541 checklistsJun 22-30: 13% of 4159 checklistsJul 1-7: 11% of 3209 checklistsJul 8-14: 11% of 2916 checklistsJul 15-21: 8.4% of 2861 checklistsJul 22-31: 8.7% of 4146 checklistsAug 1-7: 7.8% of 3043 checklistsAug 8-14: 7.2% of 2839 checklistsAug 15-21: 7.4% of 3014 checklistsAug 22-31: 6.1% of 4759 checklistsSep 1-7: 6.0% of 3861 checklistsSep 8-14: 5.3% of 3748 checklistsSep 15-21: 4.6% of 3569 checklistsSep 22-30: 5.2% of 4830 checklistsOct 1-7: 6.9% of 3809 checklistsOct 8-14: 7.0% of 4142 checklistsOct 15-21: 7.0% of 3705 checklistsOct 22-31: 6.8% of 4738 checklistsNov 1-7: 6.6% of 3823 checklistsNov 8-14: 5.6% of 3849 checklistsNov 15-21: 4.2% of 3722 checklistsNov 22-30: 3.7% of 4795 checklistsDec 1-7: 3.5% of 3324 checklistsDec 8-14: 3.4% of 3574 checklistsDec 15-21: 3.1% of 3884 checklistsDec 22-31: 3.0% of 5774 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 Oklahoma 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 Oklahoma

Best counties

Share of checklists at the peak
  1. Beckham CountyBest mid May · 21 checklists that week, 483 in all56%
  2. Texas CountyBest the second week of May · 55 checklists that week, 1,542 in all49%
  3. Custer CountyBest mid June · 39 checklists that week, 2,696 in all47%
  4. Canadian CountyBest the second week of June · 48 checklists that week, 4,307 in all43%
  5. Caddo CountyBest early May · 42 checklists that week, 1,110 in all36%
  6. Cotton CountyBest late June · 11 checklists that week, 765 in all33%

Best spots

Share of checklists at the peak
  1. Boomer Lake Park (Hazen Lake)Payne County, best early June · 22 checklists that week, 597 in all98%
  2. Myriad GardensOklahoma County, best early June · 21 checklists that week, 911 in all94%
  3. Stars & Stripes ParkOklahoma County, best late May · 27 checklists that week, 1,039 in all92%
  4. Thompson ParkTexas County, best mid April · 20 checklists that week, 333 in all83%
  5. Elmer Thomas ParkComanche County, best late October · 24 checklists that week, 343 in all82%
  6. South Lakes ParkCleveland County, best late March · 20 checklists that week, 168 in all74%

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

Best time of day

In Oklahoma, the Great-tailed Grackle is most often listed on checklists started between 6 and 8 am (11% of those checklists).

0%5%10%15%12 am: too few checklists (91) to judge1 am: too few checklists (65) to judge2 am: too few checklists (73) to judge3 am: too few checklists (73) to judge4 am: too few checklists (100) to judge5 am: too few checklists (647) to judge6 am: 12% of 8353 checklists7 am: 11% of 24509 checklists8 am: 8.1% of 27848 checklists9 am: 6.9% of 25316 checklists10 am: 7.1% of 21161 checklists11 am: 6.8% of 18730 checklists12 pm: 7.1% of 16097 checklists1 pm: 7.1% of 14028 checklists2 pm: 6.9% of 13599 checklists3 pm: 7.5% of 14228 checklists4 pm: 7.1% of 14597 checklists5 pm: 7.4% of 12125 checklists6 pm: 8.6% of 9337 checklists7 pm: 9.7% of 6944 checklists8 pm: too few checklists (2403) to judge9 pm: too few checklists (459) to judge10 pm: too few checklists (226) to judge11 pm: too few checklists (141) 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
January4.1%4.7%3.3%3.2%
February4.1%3.0%2.9%4.9%
March5.9%8.8%9.0%11%
April11%10%11%12%
May12%12%14%14%
June12%12%12%13%
July11%11%8.4%8.7%
August7.8%7.2%7.4%6.1%
September6.0%5.3%4.6%5.2%
October6.9%7.0%7.0%6.8%
November6.6%5.6%4.2%3.7%
December3.5%3.4%3.1%3.0%

Neighboring states

  • Kansas: arrives early March, 2 weeks earlier than Oklahoma
  • Nebraska: arrives mid March, in the same week than Oklahoma
  • Texas: year-round, peaks mid April
  • Louisiana: arrives mid January, 8 weeks earlier than Oklahoma

Common questions

When do Great-tailed Grackles arrive in Oklahoma?
Great-tailed Grackles are in Oklahoma all year, but most are here in spring: numbers build from mid March, peak in late May (13% of checklists), and fall back by late July. In the quietest week (mid December) they are still on about 3.1% of checklists.
When do Great-tailed Grackles leave Oklahoma?
Great-tailed Grackles never fully leave Oklahoma: numbers fall back below half their usual rate by late July, but some are still reported in every week, about 3.1% of checklists at the low.
When is the best time to see a Great-tailed Grackle in Oklahoma?
The Great-tailed Grackle is reported most often in late May, on about 13% of Oklahoma checklists.
Where in Oklahoma are Great-tailed Grackles seen most often?
By county, Beckham County, Texas County, and Custer County have the highest peak reporting rates for the Great-tailed Grackle (counties with at least 200 checklists).