WhenToBird

Astur cooperii · Accipitridae

When Do Cooper's Hawks Arrive in Indiana?

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

Cooper's Hawks are in Indiana all year, but most are here in fall: numbers build from the second week of September, peak in early October (8.2% of checklists), and fall back by the second week of November. In the quietest week (mid June) they are still on about 2.9% of checklists.

When to look

Numbers buildSep 8-14the second week of September
PeakOct 1-7early October
Fall back byNov 8-14the second week of November
FewestJun 15-21mid June

Best: early October. Here all year; numbers build from the second week of September and fall back by the second week of November. Peak: on about 8.2% of Indiana checklists.

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

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

0%5%10%Jan 1-7: 5.2% of 18123 checklistsJan 8-14: 5.2% of 12006 checklistsJan 15-21: 5.2% of 12403 checklistsJan 22-31: 4.7% of 16181 checklistsFeb 1-7: 4.4% of 12546 checklistsFeb 8-14: 4.2% of 14250 checklistsFeb 15-21: 4.3% of 18077 checklistsFeb 22-28: 3.9% of 13590 checklistsMar 1-7: 4.3% of 14545 checklistsMar 8-14: 4.4% of 14594 checklistsMar 15-21: 4.9% of 13894 checklistsMar 22-31: 5.1% of 22400 checklistsApr 1-7: 5.6% of 18069 checklistsApr 8-14: 6.0% of 19579 checklistsApr 15-21: 6.0% of 19518 checklistsApr 22-30: 5.7% of 30544 checklistsMay 1-7: 5.3% of 28430 checklistsMay 8-14: 4.0% of 30624 checklistsMay 15-21: 3.2% of 22920 checklistsMay 22-31: 2.8% of 21234 checklistsJun 1-7: 3.0% of 12279 checklistsJun 8-14: 3.0% of 10904 checklistsJun 15-21: 2.9% of 9488 checklistsJun 22-30: 2.7% of 11362 checklistsJul 1-7: 3.5% of 9947 checklistsJul 8-14: 3.3% of 9585 checklistsJul 15-21: 3.5% of 8929 checklistsJul 22-31: 3.2% of 12639 checklistsAug 1-7: 3.6% of 9528 checklistsAug 8-14: 4.4% of 9451 checklistsAug 15-21: 4.4% of 9442 checklistsAug 22-31: 4.8% of 14969 checklistsSep 1-7: 5.4% of 12628 checklistsSep 8-14: 6.3% of 11793 checklistsSep 15-21: 7.0% of 11396 checklistsSep 22-30: 8.5% of 14203 checklistsOct 1-7: 8.1% of 11365 checklistsOct 8-14: 7.8% of 12092 checklistsOct 15-21: 7.2% of 10440 checklistsOct 22-31: 6.9% of 13883 checklistsNov 1-7: 6.0% of 10476 checklistsNov 8-14: 6.0% of 9776 checklistsNov 15-21: 5.7% of 9035 checklistsNov 22-30: 4.6% of 12547 checklistsDec 1-7: 5.3% of 9078 checklistsDec 8-14: 5.5% of 8732 checklistsDec 15-21: 5.2% of 11024 checklistsDec 22-31: 5.1% of 15432 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 Indiana 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 Indiana

Best counties

Share of checklists at the peak
  1. Delaware CountyBest the second week of July · 64 checklists that week, 6,085 in all35%
  2. Blackford CountyBest mid January · 26 checklists that week, 962 in all30%
  3. Scott CountyBest early January · 28 checklists that week, 798 in all20%
  4. Rush CountyBest the second week of April · 12 checklists that week, 460 in all19%
  5. Montgomery CountyBest mid October · 100 checklists that week, 2,917 in all19%
  6. Howard CountyBest mid April · 20 checklists that week, 788 in all16%

Best spots

Share of checklists at the peak
  1. Cool Creek ParkHamilton County, best mid March · 37 checklists that week, 2,075 in all48%
  2. Lakefront ParkLake County, best late April · 25 checklists that week, 1,190 in all34%
  3. Imperial HillsJohnson County, best late September · 31 checklists that week, 543 in all33%
  4. Franke ParkAllen County, best the second week of April · 29 checklists that week, 820 in all33%
  5. Prairie Creek ReservoirDelaware County, best late April · 22 checklists that week, 618 in all33%
  6. Vaughn HollowBrown County, best early October · 25 checklists that week, 919 in all30%

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

Best time of day

In Indiana, the Cooper's Hawk is most often listed on checklists started between 7 and 9 am (6.6% of those checklists).

0%2%4%6%8%12 am: too few checklists (240) to judge1 am: too few checklists (231) to judge2 am: too few checklists (222) to judge3 am: too few checklists (202) to judge4 am: too few checklists (674) to judge5 am: too few checklists (4329) to judge6 am: 5.9% of 20589 checklists7 am: 6.6% of 58470 checklists8 am: 6.6% of 86931 checklists9 am: 5.4% of 78239 checklists10 am: 4.9% of 66080 checklists11 am: 4.5% of 54904 checklists12 pm: 4.4% of 47610 checklists1 pm: 4.3% of 44814 checklists2 pm: 4.1% of 43790 checklists3 pm: 4.6% of 42983 checklists4 pm: 4.4% of 45349 checklists5 pm: 4.0% of 35993 checklists6 pm: 3.6% of 26447 checklists7 pm: 2.8% of 17740 checklists8 pm: too few checklists (7603) to judge9 pm: too few checklists (1721) to judge10 pm: too few checklists (517) to judge11 pm: too few checklists (272) 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
January5.2%5.2%5.2%4.7%
February4.4%4.2%4.3%3.9%
March4.3%4.4%4.9%5.1%
April5.6%6.0%6.0%5.7%
May5.3%4.0%3.2%2.8%
June3.0%3.0%2.9%2.7%
July3.5%3.3%3.5%3.2%
August3.6%4.4%4.4%4.8%
September5.4%6.3%7.0%8.5%
October8.1%7.8%7.2%6.9%
November6.0%6.0%5.7%4.6%
December5.3%5.5%5.2%5.1%

Neighboring states

  • Illinois: arrives late August, 2 weeks earlier than Indiana
  • Kentucky: arrives mid August, 3 weeks earlier than Indiana
  • Ohio: arrives early September, 1 week earlier than Indiana
  • Michigan: arrives the second week of July, 8 weeks earlier than Indiana

Common questions

When do Cooper's Hawks arrive in Indiana?
Cooper's Hawks are in Indiana all year, but most are here in fall: numbers build from the second week of September, peak in early October (8.2% of checklists), and fall back by the second week of November. In the quietest week (mid June) they are still on about 2.9% of checklists.
When do Cooper's Hawks leave Indiana?
Cooper's Hawks never fully leave Indiana: numbers fall back below half their usual rate by the second week of November, but some are still reported in every week, about 2.9% of checklists at the low.
When is the best time to see a Cooper's Hawk in Indiana?
The Cooper's Hawk is reported most often in early October, on about 8.2% of Indiana checklists.
Where in Indiana are Cooper's Hawks seen most often?
By county, Delaware County, Blackford County, and Scott County have the highest peak reporting rates for the Cooper's Hawk (counties with at least 200 checklists).