WhenToBird

Quiscalus mexicanus · Icteridae

When Do Great-tailed Grackles Arrive in Arizona?

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

The Great-tailed Grackle is in Arizona all year. It turns up on about 25% of checklists at its peak (early November) and on 14% in its quietest week (the second week of August).

When to look

PresentAll year
Peak weekNov 1-7early November
Quietest weekAug 8-14the second week of August

Best: early November. Here all year. Peak: on about 25% of Arizona checklists.

  1. Janpeak season
  2. Febpeak season
  3. Marpeak season
  4. Aprpeak season
  5. Maypeak season
  6. Junpeak season
  7. Julpeak season
  8. Augcommon
  9. Seppeak season
  10. Octpeak season
  11. Novpeak season
  12. Decpeak season

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

0%10%20%30%Jan 1-7: 20% of 34758 checklistsJan 8-14: 20% of 29835 checklistsJan 15-21: 21% of 29279 checklistsJan 22-31: 21% of 39716 checklistsFeb 1-7: 21% of 27299 checklistsFeb 8-14: 22% of 28703 checklistsFeb 15-21: 22% of 35357 checklistsFeb 22-28: 23% of 29889 checklistsMar 1-7: 23% of 29932 checklistsMar 8-14: 24% of 32982 checklistsMar 15-21: 24% of 34731 checklistsMar 22-31: 24% of 50213 checklistsApr 1-7: 24% of 35788 checklistsApr 8-14: 23% of 38087 checklistsApr 15-21: 22% of 41520 checklistsApr 22-30: 22% of 55218 checklistsMay 1-7: 22% of 39688 checklistsMay 8-14: 23% of 39398 checklistsMay 15-21: 23% of 29562 checklistsMay 22-31: 22% of 36774 checklistsJun 1-7: 22% of 21313 checklistsJun 8-14: 22% of 19129 checklistsJun 15-21: 23% of 17922 checklistsJun 22-30: 23% of 21188 checklistsJul 1-7: 22% of 17325 checklistsJul 8-14: 21% of 16463 checklistsJul 15-21: 20% of 18642 checklistsJul 22-31: 18% of 31215 checklistsAug 1-7: 14% of 28163 checklistsAug 8-14: 13% of 31329 checklistsAug 15-21: 15% of 23878 checklistsAug 22-31: 17% of 28508 checklistsSep 1-7: 17% of 20878 checklistsSep 8-14: 18% of 19671 checklistsSep 15-21: 18% of 19859 checklistsSep 22-30: 19% of 25179 checklistsOct 1-7: 20% of 19420 checklistsOct 8-14: 22% of 21925 checklistsOct 15-21: 25% of 20995 checklistsOct 22-31: 25% of 29258 checklistsNov 1-7: 25% of 21269 checklistsNov 8-14: 25% of 22753 checklistsNov 15-21: 25% of 21982 checklistsNov 22-30: 24% of 29475 checklistsDec 1-7: 23% of 20810 checklistsDec 8-14: 20% of 22229 checklistsDec 15-21: 20% of 25148 checklistsDec 22-31: 21% of 39567 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 Arizona 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 Arizona

Best counties

Share of checklists at the peak
  1. Maricopa CountyBest mid June · 2764 checklists that week, 269,896 in all67%
  2. Yuma CountyBest late June · 150 checklists that week, 14,687 in all59%
  3. La Paz CountyBest late May · 131 checklists that week, 7,279 in all47%
  4. Greenlee CountyBest early January · 30 checklists that week, 2,745 in all37%
  5. Pinal CountyBest mid July · 500 checklists that week, 40,036 in all35%
  6. Graham CountyBest early April · 234 checklists that week, 9,876 in all35%

Best spots

Share of checklists at the peak
  1. Rio Vista Community ParkMaricopa County, best late March · 26 checklists that week, 627 in all100%
  2. Monterey ParkMaricopa County, best early April · 23 checklists that week, 175 in all98%

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

Best time of day

In Arizona, the Great-tailed Grackle is most often listed on checklists started between 5 and 7 am (30% of those checklists).

0%10%20%30%40%12 am: too few checklists (488) to judge1 am: too few checklists (503) to judge2 am: too few checklists (489) to judge3 am: too few checklists (735) to judge4 am: too few checklists (4115) to judge5 am: 32% of 38350 checklists6 am: 30% of 118786 checklists7 am: 26% of 183415 checklists8 am: 23% of 187346 checklists9 am: 20% of 151342 checklists10 am: 18% of 124522 checklists11 am: 17% of 97088 checklists12 pm: 17% of 78110 checklists1 pm: 17% of 73059 checklists2 pm: 18% of 68912 checklists3 pm: 19% of 68060 checklists4 pm: 21% of 69387 checklists5 pm: 21% of 52951 checklists6 pm: 19% of 31061 checklists7 pm: too few checklists (16076) to judge8 pm: too few checklists (5352) to judge9 pm: too few checklists (2369) to judge10 pm: too few checklists (1100) to judge11 pm: too few checklists (604) 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
January20%20%21%21%
February21%22%22%23%
March23%24%24%24%
April24%23%22%22%
May22%23%23%22%
June22%22%23%23%
July22%21%20%18%
August14%13%15%17%
September17%18%18%19%
October20%22%25%25%
November25%25%25%24%
December23%20%20%21%

Neighboring states

  • New Mexico: all year, most in spring, peaks early May
  • Nevada: year-round, peaks late April
  • Utah: all year, most in spring, peaks late April
  • California: all year, most in spring, peaks early May

Common questions

When do Great-tailed Grackles arrive in Arizona?
The Great-tailed Grackle is in Arizona all year. It turns up on about 25% of checklists at its peak (early November) and on 14% in its quietest week (the second week of August).
When do Great-tailed Grackles leave Arizona?
The Great-tailed Grackle does not leave Arizona: it is reported all year, from 14% of checklists in the second week of August to 25% in early November.
When is the best time to see a Great-tailed Grackle in Arizona?
The Great-tailed Grackle is reported most often in early November, on about 25% of Arizona checklists.
Where in Arizona are Great-tailed Grackles seen most often?
By county, Maricopa County, Yuma County, and La Paz County have the highest peak reporting rates for the Great-tailed Grackle (counties with at least 200 checklists).