WhenToBird

Astur cooperii · Accipitridae

When Do Cooper's Hawks Arrive in Minnesota?

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

Cooper's Hawks reach Minnesota in the second week of March, are common by late March, peak in the second week of September (6.0% of checklists), and most are gone by mid October.

When to look

First arrivalsMar 8-14the second week of March
Common byMar 22-31late March
PeakSep 8-14the second week of September
Most gone byOct 15-21mid October

Best: the second week of September. First arrivals the second week of March; most are gone by mid October. Peak: on about 6.0% of Minnesota checklists.

  1. Janrare
  2. Febrare
  3. Maruncommon
  4. Aprcommon
  5. Maycommon
  6. Jununcommon
  7. Julcommon
  8. Augpeak season
  9. Seppeak season
  10. Octcommon
  11. Novuncommon
  12. Decuncommon

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

0%2%4%6%8%Jan 1-7: 0.8% of 20628 checklistsJan 8-14: 0.6% of 14594 checklistsJan 15-21: 0.8% of 14238 checklistsJan 22-31: 0.7% of 20725 checklistsFeb 1-7: 0.6% of 14484 checklistsFeb 8-14: 0.6% of 15988 checklistsFeb 15-21: 0.7% of 20718 checklistsFeb 22-28: 0.7% of 15754 checklistsMar 1-7: 0.8% of 16125 checklistsMar 8-14: 1.0% of 19035 checklistsMar 15-21: 1.2% of 19586 checklistsMar 22-31: 1.8% of 30192 checklistsApr 1-7: 3.3% of 24262 checklistsApr 8-14: 3.9% of 30223 checklistsApr 15-21: 3.9% of 29085 checklistsApr 22-30: 4.2% of 43574 checklistsMay 1-7: 4.7% of 39300 checklistsMay 8-14: 3.8% of 45927 checklistsMay 15-21: 2.9% of 36632 checklistsMay 22-31: 2.2% of 43809 checklistsJun 1-7: 1.9% of 23418 checklistsJun 8-14: 1.9% of 20450 checklistsJun 15-21: 2.1% of 19470 checklistsJun 22-30: 2.5% of 23418 checklistsJul 1-7: 2.5% of 19104 checklistsJul 8-14: 2.4% of 16927 checklistsJul 15-21: 2.5% of 15635 checklistsJul 22-31: 2.8% of 22073 checklistsAug 1-7: 3.2% of 16255 checklistsAug 8-14: 3.8% of 16840 checklistsAug 15-21: 4.1% of 17475 checklistsAug 22-31: 4.7% of 26545 checklistsSep 1-7: 5.6% of 20750 checklistsSep 8-14: 6.5% of 18494 checklistsSep 15-21: 6.0% of 18215 checklistsSep 22-30: 4.6% of 24463 checklistsOct 1-7: 3.6% of 18252 checklistsOct 8-14: 2.2% of 19527 checklistsOct 15-21: 1.9% of 17098 checklistsOct 22-31: 1.3% of 24570 checklistsNov 1-7: 1.2% of 16744 checklistsNov 8-14: 1.0% of 13483 checklistsNov 15-21: 1.0% of 12525 checklistsNov 22-30: 1.0% of 17023 checklistsDec 1-7: 0.9% of 11645 checklistsDec 8-14: 1.0% of 11567 checklistsDec 15-21: 1.0% of 13343 checklistsDec 22-31: 0.8% of 19759 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 Minnesota 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 Minnesota

Best counties

Share of checklists at the peak
  1. Steele CountyBest early August · 126 checklists that week, 4,784 in all16%
  2. Polk CountyBest the second week of August · 284 checklists that week, 14,997 in all13%
  3. Clay CountyBest the second week of September · 138 checklists that week, 9,201 in all13%
  4. Martin CountyBest late November · 12 checklists that week, 1,016 in all13%
  5. Redwood CountyBest early October · 97 checklists that week, 1,193 in all12%
  6. Lyon CountyBest mid January · 28 checklists that week, 4,283 in all11%

Best spots

Share of checklists at the peak
  1. Original Homestead ParkClay County, best late April · 29 checklists that week, 252 in all40%
  2. Powderhorn ParkHennepin County, best late April · 110 checklists that week, 2,272 in all38%
  3. Carpenter St. Criox Valley Nature CenterWashington County, best mid September · 96 checklists that week, 2,734 in all35%
  4. Smsu Nature AreaLyon County, best early May · 23 checklists that week, 293 in all33%
  5. Wilmes LakeWashington County, best the second week of May · 34 checklists that week, 205 in all32%

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

Best time of day

In Minnesota, the Cooper's Hawk is most often listed on checklists started between 6 and 8 am (3.8% of those checklists).

0%1%2%3%4%12 am: too few checklists (349) to judge1 am: too few checklists (331) to judge2 am: too few checklists (286) to judge3 am: too few checklists (364) to judge4 am: too few checklists (863) to judge5 am: too few checklists (7598) to judge6 am: 4.0% of 35775 checklists7 am: 3.7% of 90565 checklists8 am: 3.4% of 110612 checklists9 am: 3.0% of 106128 checklists10 am: 2.6% of 96131 checklists11 am: 2.3% of 83750 checklists12 pm: 2.1% of 76254 checklists1 pm: 2.1% of 73480 checklists2 pm: 1.9% of 73703 checklists3 pm: 2.0% of 75249 checklists4 pm: 2.1% of 68810 checklists5 pm: 2.5% of 51899 checklists6 pm: 2.4% of 38524 checklists7 pm: 2.2% of 25120 checklists8 pm: too few checklists (10568) to judge9 pm: too few checklists (2420) to judge10 pm: too few checklists (748) to judge11 pm: too few checklists (420) 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
January0.8%0.6%0.8%0.7%
February0.6%0.6%0.7%0.7%
March0.8%1.0%1.2%1.8%
April3.3%3.9%3.9%4.2%
May4.7%3.8%2.9%2.2%
June1.9%1.9%2.1%2.5%
July2.5%2.4%2.5%2.8%
August3.2%3.8%4.1%4.7%
September5.6%6.5%6.0%4.6%
October3.6%2.2%1.9%1.3%
November1.2%1.0%1.0%1.0%
December0.9%1.0%1.0%0.8%

Neighboring states

  • Iowa: arrives mid June, 13 weeks later than Minnesota
  • Wisconsin: arrives late August, 22 weeks later than Minnesota
  • South Dakota: arrives early July, 15 weeks later than Minnesota
  • North Dakota: arrives mid March, 1 week later than Minnesota

Common questions

When do Cooper's Hawks arrive in Minnesota?
Cooper's Hawks reach Minnesota in the second week of March, are common by late March, peak in the second week of September (6.0% of checklists), and most are gone by mid October.
When do Cooper's Hawks leave Minnesota?
Most Cooper's Hawks have left Minnesota by mid October, when reports fall below half their usual rate. Stragglers are still reported until the second week of November.
When is the best time to see a Cooper's Hawk in Minnesota?
The Cooper's Hawk is reported most often in the second week of September, on about 6.0% of Minnesota checklists.
Where in Minnesota are Cooper's Hawks seen most often?
By county, Steele County, Polk County, and Clay County have the highest peak reporting rates for the Cooper's Hawk (counties with at least 200 checklists).