WhenToBird

Astur cooperii · Accipitridae

When Do Cooper's Hawks Arrive in Missouri?

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

Cooper's Hawks are winter birds in Missouri: the first arrive in mid June, they are common by early August, peak in early October (5.9% of checklists), and most are gone by the second week of May.

When to look

First arrivalsJun 15-21mid June
Common byAug 1-7early August
PeakOct 1-7early October
Most gone byMay 8-14the second week of May

Best: early October. First arrivals mid June; most are gone by the second week of May. Peak: on about 5.9% of Missouri checklists.

  1. Jancommon
  2. Febcommon
  3. Marcommon
  4. Aprcommon
  5. Maycommon
  6. Jununcommon
  7. Julcommon
  8. Augcommon
  9. Seppeak season
  10. Octpeak season
  11. Novcommon
  12. Deccommon

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

0%2%4%6%8%Jan 1-7: 3.6% of 12628 checklistsJan 8-14: 3.3% of 9076 checklistsJan 15-21: 3.6% of 8790 checklistsJan 22-31: 3.1% of 11986 checklistsFeb 1-7: 3.2% of 8987 checklistsFeb 8-14: 3.0% of 10394 checklistsFeb 15-21: 3.2% of 15472 checklistsFeb 22-28: 2.7% of 9917 checklistsMar 1-7: 3.2% of 9877 checklistsMar 8-14: 3.2% of 9570 checklistsMar 15-21: 3.3% of 10274 checklistsMar 22-31: 4.2% of 16156 checklistsApr 1-7: 4.2% of 12774 checklistsApr 8-14: 4.0% of 14048 checklistsApr 15-21: 3.8% of 14894 checklistsApr 22-30: 3.7% of 23288 checklistsMay 1-7: 3.2% of 22645 checklistsMay 8-14: 2.7% of 21384 checklistsMay 15-21: 1.9% of 13989 checklistsMay 22-31: 1.7% of 15784 checklistsJun 1-7: 1.7% of 9691 checklistsJun 8-14: 1.8% of 9036 checklistsJun 15-21: 1.6% of 7907 checklistsJun 22-30: 2.5% of 9831 checklistsJul 1-7: 2.5% of 8008 checklistsJul 8-14: 2.0% of 7202 checklistsJul 15-21: 2.2% of 7151 checklistsJul 22-31: 2.5% of 9833 checklistsAug 1-7: 3.0% of 7639 checklistsAug 8-14: 3.4% of 7507 checklistsAug 15-21: 3.6% of 7429 checklistsAug 22-31: 3.7% of 11182 checklistsSep 1-7: 4.5% of 9471 checklistsSep 8-14: 5.1% of 8501 checklistsSep 15-21: 5.3% of 8169 checklistsSep 22-30: 6.2% of 11572 checklistsOct 1-7: 5.8% of 9028 checklistsOct 8-14: 5.6% of 9413 checklistsOct 15-21: 5.1% of 8656 checklistsOct 22-31: 4.7% of 11625 checklistsNov 1-7: 3.8% of 8627 checklistsNov 8-14: 3.8% of 8284 checklistsNov 15-21: 3.8% of 8075 checklistsNov 22-30: 3.6% of 10430 checklistsDec 1-7: 3.7% of 7870 checklistsDec 8-14: 3.0% of 7567 checklistsDec 15-21: 3.8% of 9696 checklistsDec 22-31: 3.7% of 13142 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 Missouri 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 Missouri

Best counties

Share of checklists at the peak
  1. Barton CountyBest late September · 33 checklists that week, 1,629 in all26%
  2. Clark CountyBest mid February · 10 checklists that week, 302 in all20%
  3. Ste. Genevieve CountyBest late November · 25 checklists that week, 1,675 in all19%
  4. St. Clair CountyBest the second week of October · 34 checklists that week, 1,484 in all16%
  5. Moniteau CountyBest mid February · 10 checklists that week, 614 in all16%
  6. St. Louis CityBest mid September · 578 checklists that week, 28,925 in all16%

Best spots

Share of checklists at the peak
  1. Willmore ParkSt. Louis City, best late April · 22 checklists that week, 231 in all31%
  2. Sailboat CoveJackson County, best early April · 21 checklists that week, 616 in all28%
  3. Burr Oak Woods Conservation AreaJackson County, best early April · 29 checklists that week, 1,443 in all26%
  4. Eagle Bluffs Conservation AreaBoone County, best late September · 42 checklists that week, 1,684 in all25%
  5. Jerry Smith ParkJackson County, best mid October · 26 checklists that week, 1,156 in all24%

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

Best time of day

In Missouri, the Cooper's Hawk is most often listed on checklists started between 7 and 9 am (4.3% of those checklists).

0%2%4%6%12 am: too few checklists (205) to judge1 am: too few checklists (179) to judge2 am: too few checklists (204) to judge3 am: too few checklists (216) to judge4 am: too few checklists (630) to judge5 am: too few checklists (5072) to judge6 am: 3.8% of 27231 checklists7 am: 4.3% of 64162 checklists8 am: 4.3% of 67854 checklists9 am: 3.9% of 56515 checklists10 am: 3.4% of 47496 checklists11 am: 3.1% of 38845 checklists12 pm: 3.1% of 33383 checklists1 pm: 3.1% of 32503 checklists2 pm: 3.1% of 32615 checklists3 pm: 3.1% of 32514 checklists4 pm: 2.9% of 30274 checklists5 pm: 2.8% of 23446 checklists6 pm: 2.5% of 16374 checklists7 pm: too few checklists (10236) to judge8 pm: too few checklists (3133) to judge9 pm: too few checklists (722) to judge10 pm: too few checklists (405) to judge11 pm: too few checklists (261) 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
January3.6%3.3%3.6%3.1%
February3.2%3.0%3.2%2.7%
March3.2%3.2%3.3%4.2%
April4.2%4.0%3.8%3.7%
May3.2%2.7%1.9%1.7%
June1.7%1.8%1.6%2.5%
July2.5%2.0%2.2%2.5%
August3.0%3.4%3.6%3.7%
September4.5%5.1%5.3%6.2%
October5.8%5.6%5.1%4.7%
November3.8%3.8%3.8%3.6%
December3.7%3.0%3.8%3.7%

Neighboring states

  • Arkansas: arrives mid June, in the same week than Missouri
  • Iowa: arrives mid June, in the same week than Missouri
  • Kansas: arrives early September, 10 weeks later than Missouri
  • Illinois: arrives late August, 9 weeks later than Missouri

Common questions

When do Cooper's Hawks arrive in Missouri?
Cooper's Hawks are winter birds in Missouri: the first arrive in mid June, they are common by early August, peak in early October (5.9% of checklists), and most are gone by the second week of May.
When do Cooper's Hawks leave Missouri?
Most Cooper's Hawks have left Missouri by the second week of May, when reports fall below half their usual rate. Stragglers are still reported until mid May.
When is the best time to see a Cooper's Hawk in Missouri?
The Cooper's Hawk is reported most often in early October, on about 5.9% of Missouri checklists.
Where in Missouri are Cooper's Hawks seen most often?
By county, Barton County, Clark County, and Ste. Genevieve County have the highest peak reporting rates for the Cooper's Hawk (counties with at least 200 checklists).