WhenToBird

Astur cooperii · Accipitridae

When Do Cooper's Hawks Arrive in Arizona?

Adult male Cooper's Hawk
Photo: Shirley Zundell, CC BY 4.0 via iNaturalist

The Cooper's Hawk is in Arizona all year. It turns up on about 19% of checklists at its peak (early October) and on 8.4% in its quietest week (late May).

When to look

PresentAll year
Peak weekOct 1-7early October
Quietest weekMay 22-31late May

Best: early October. Here all year. Peak: on about 19% of Arizona checklists.

  1. Jancommon
  2. Febpeak season
  3. Marpeak season
  4. Aprpeak season
  5. Maycommon
  6. Juncommon
  7. Julcommon
  8. Augcommon
  9. Seppeak season
  10. Octpeak season
  11. Novpeak season
  12. Decpeak season

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

0%5%10%15%20%Jan 1-7: 13% of 34758 checklistsJan 8-14: 12% of 29835 checklistsJan 15-21: 12% of 29279 checklistsJan 22-31: 12% of 39716 checklistsFeb 1-7: 12% of 27299 checklistsFeb 8-14: 13% of 28703 checklistsFeb 15-21: 13% of 35357 checklistsFeb 22-28: 14% of 29889 checklistsMar 1-7: 16% of 29932 checklistsMar 8-14: 18% of 32982 checklistsMar 15-21: 18% of 34731 checklistsMar 22-31: 16% of 50213 checklistsApr 1-7: 15% of 35788 checklistsApr 8-14: 14% of 38087 checklistsApr 15-21: 12% of 41520 checklistsApr 22-30: 11% of 55218 checklistsMay 1-7: 9.8% of 39688 checklistsMay 8-14: 8.8% of 39398 checklistsMay 15-21: 8.7% of 29562 checklistsMay 22-31: 8.0% of 36774 checklistsJun 1-7: 8.5% of 21313 checklistsJun 8-14: 9.1% of 19129 checklistsJun 15-21: 10% of 17922 checklistsJun 22-30: 10% of 21188 checklistsJul 1-7: 10% of 17325 checklistsJul 8-14: 11% of 16463 checklistsJul 15-21: 10% of 18642 checklistsJul 22-31: 10% of 31215 checklistsAug 1-7: 9.3% of 28163 checklistsAug 8-14: 8.8% of 31329 checklistsAug 15-21: 9.6% of 23878 checklistsAug 22-31: 11% of 28508 checklistsSep 1-7: 13% of 20878 checklistsSep 8-14: 15% of 19671 checklistsSep 15-21: 17% of 19859 checklistsSep 22-30: 19% of 25179 checklistsOct 1-7: 19% of 19420 checklistsOct 8-14: 18% of 21925 checklistsOct 15-21: 18% of 20995 checklistsOct 22-31: 17% of 29258 checklistsNov 1-7: 17% of 21269 checklistsNov 8-14: 15% of 22753 checklistsNov 15-21: 15% of 21982 checklistsNov 22-30: 15% of 29475 checklistsDec 1-7: 15% of 20810 checklistsDec 8-14: 15% of 22229 checklistsDec 15-21: 14% of 25148 checklistsDec 22-31: 13% 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. Pima CountyBest early October · 5735 checklists that week, 437,722 in all33%
  2. Santa Cruz CountyBest the second week of March · 5243 checklists that week, 162,726 in all20%
  3. Yuma CountyBest early October · 175 checklists that week, 14,687 in all18%
  4. Yavapai CountyBest the second week of July · 1053 checklists that week, 83,606 in all15%
  5. Maricopa CountyBest late September · 5590 checklists that week, 269,896 in all15%
  6. Cochise CountyBest the second week of October · 2238 checklists that week, 190,093 in all15%

Best spots

Share of checklists at the peak
  1. Tucson National Golf CoursePima County, best late March · 28 checklists that week, 628 in all92%
  2. Villa Serena ParkPima County, best the second week of October · 28 checklists that week, 1,209 in all92%
  3. Himmel ParkPima County, best the second week of August · 33 checklists that week, 2,776 in all90%
  4. Randolph ParkPima County, best early September · 33 checklists that week, 2,188 in all81%
  5. Northcentral District ParkPima County, best late September · 43 checklists that week, 1,555 in all79%
  6. FlapPima County, best the second week of March · 37 checklists that week, 475 in all78%

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

Best time of day

In Arizona, the Cooper's Hawk is most often listed on checklists started between 5 and 7 am (21% of those checklists).

0%10%20%30%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: 20% of 38350 checklists6 am: 21% of 118786 checklists7 am: 19% of 183415 checklists8 am: 16% of 187346 checklists9 am: 12% of 151342 checklists10 am: 9.7% of 124522 checklists11 am: 8.1% of 97088 checklists12 pm: 7.6% of 78110 checklists1 pm: 7.8% of 73059 checklists2 pm: 8.8% of 68912 checklists3 pm: 10% of 68060 checklists4 pm: 12% of 69387 checklists5 pm: 11% of 52951 checklists6 pm: 7.7% 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
January13%12%12%12%
February12%13%13%14%
March16%18%18%16%
April15%14%12%11%
May9.8%8.8%8.7%8.0%
June8.5%9.1%10%10%
July10%11%10%10%
August9.3%8.8%9.6%11%
September13%15%17%19%
October19%18%18%17%
November17%15%15%15%
December15%15%14%13%

Neighboring states

  • New Mexico: year-round, peaks the second week of April
  • Nevada: all year, most in fall, peaks late September
  • Utah: year-round, peaks mid September
  • California: year-round, peaks late September

Common questions

When do Cooper's Hawks arrive in Arizona?
The Cooper's Hawk is in Arizona all year. It turns up on about 19% of checklists at its peak (early October) and on 8.4% in its quietest week (late May).
When do Cooper's Hawks leave Arizona?
The Cooper's Hawk does not leave Arizona: it is reported all year, from 8.4% of checklists in late May to 19% in early October.
When is the best time to see a Cooper's Hawk in Arizona?
The Cooper's Hawk is reported most often in early October, on about 19% of Arizona checklists.
Where in Arizona are Cooper's Hawks seen most often?
By county, Pima County, Santa Cruz County, and Yuma County have the highest peak reporting rates for the Cooper's Hawk (counties with at least 200 checklists).