WhenToBird

Astur cooperii · Accipitridae

When Do Cooper's Hawks Arrive in Nebraska?

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

Cooper's Hawks reach Nebraska in mid June, are common by early August, peak in late September (7.3% of checklists), and most are gone by mid May.

When to look

First arrivalsJun 15-21mid June
Common byAug 1-7early August
PeakSep 22-30late September
Most gone byMay 15-21mid May

Best: late September. First arrivals mid June; most are gone by mid May. Peak: on about 7.3% of Nebraska checklists.

  1. Jancommon
  2. Febuncommon
  3. Marcommon
  4. Aprcommon
  5. Maycommon
  6. Jununcommon
  7. Juluncommon
  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: 3.4% of 4210 checklistsJan 8-14: 3.2% of 2891 checklistsJan 15-21: 2.5% of 2685 checklistsJan 22-31: 2.3% of 3834 checklistsFeb 1-7: 2.9% of 2803 checklistsFeb 8-14: 2.7% of 3134 checklistsFeb 15-21: 2.6% of 4508 checklistsFeb 22-28: 1.9% of 3238 checklistsMar 1-7: 2.7% of 3862 checklistsMar 8-14: 2.6% of 4894 checklistsMar 15-21: 3.1% of 5862 checklistsMar 22-31: 3.4% of 8598 checklistsApr 1-7: 3.7% of 5530 checklistsApr 8-14: 3.7% of 5528 checklistsApr 15-21: 4.1% of 6091 checklistsApr 22-30: 3.7% of 8661 checklistsMay 1-7: 3.1% of 9842 checklistsMay 8-14: 3.4% of 10044 checklistsMay 15-21: 2.6% of 8863 checklistsMay 22-31: 2.0% of 10207 checklistsJun 1-7: 1.3% of 4922 checklistsJun 8-14: 1.6% of 4054 checklistsJun 15-21: 1.8% of 3680 checklistsJun 22-30: 2.0% of 4349 checklistsJul 1-7: 2.1% of 3277 checklistsJul 8-14: 2.2% of 2803 checklistsJul 15-21: 2.1% of 2842 checklistsJul 22-31: 2.3% of 3920 checklistsAug 1-7: 2.7% of 2981 checklistsAug 8-14: 2.9% of 2819 checklistsAug 15-21: 3.8% of 3179 checklistsAug 22-31: 4.5% of 4599 checklistsSep 1-7: 5.8% of 3958 checklistsSep 8-14: 6.6% of 3460 checklistsSep 15-21: 6.7% of 3435 checklistsSep 22-30: 7.7% of 4975 checklistsOct 1-7: 7.3% of 3611 checklistsOct 8-14: 6.3% of 3605 checklistsOct 15-21: 5.4% of 3474 checklistsOct 22-31: 4.5% of 4352 checklistsNov 1-7: 3.8% of 3119 checklistsNov 8-14: 3.8% of 2887 checklistsNov 15-21: 3.2% of 2568 checklistsNov 22-30: 2.8% of 3506 checklistsDec 1-7: 3.3% of 2453 checklistsDec 8-14: 3.6% of 2756 checklistsDec 15-21: 3.4% of 3760 checklistsDec 22-31: 3.9% of 3746 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 Nebraska 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 Nebraska

Best counties

Share of checklists at the peak
  1. Wayne CountyBest late June · 25 checklists that week, 1,960 in all24%
  2. Butler CountyBest early September · 15 checklists that week, 589 in all19%
  3. Furnas CountyBest mid October · 12 checklists that week, 356 in all16%
  4. Saline CountyBest mid September · 10 checklists that week, 724 in all16%
  5. Polk CountyBest early January · 11 checklists that week, 290 in all15%
  6. Dakota CountyBest the second week of September · 23 checklists that week, 2,182 in all14%

Best spots

Share of checklists at the peak
  1. Salt LakeLancaster County, best the second week of September · 69 checklists that week, 2,553 in all32%
  2. Glacier Creek PreserveDouglas County, best early October · 23 checklists that week, 291 in all32%
  3. Flanagan Lake & Recreation AreaDouglas County, best late September · 43 checklists that week, 1,089 in all30%
  4. Marsh WrenLancaster County, best mid October · 80 checklists that week, 1,817 in all25%
  5. Janicek ReservoirKimball County, best early September · 26 checklists that week, 173 in all23%

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

Best time of day

In Nebraska, the Cooper's Hawk is most often listed on checklists started between 6 and 8 am (5.0% of those checklists).

0%2%4%6%12 am: too few checklists (60) to judge1 am: too few checklists (70) to judge2 am: too few checklists (74) to judge3 am: too few checklists (97) to judge4 am: too few checklists (318) to judge5 am: too few checklists (1382) to judge6 am: 4.7% of 6945 checklists7 am: 5.1% of 19066 checklists8 am: 4.7% of 24661 checklists9 am: 3.7% of 23438 checklists10 am: 3.6% of 20424 checklists11 am: 2.9% of 16727 checklists12 pm: 2.7% of 14774 checklists1 pm: 2.5% of 14443 checklists2 pm: 2.6% of 14830 checklists3 pm: 2.9% of 14445 checklists4 pm: 2.9% of 13353 checklists5 pm: 3.0% of 10506 checklists6 pm: 2.8% of 9208 checklists7 pm: 2.3% of 6334 checklists8 pm: too few checklists (2406) to judge9 pm: too few checklists (531) to judge10 pm: too few checklists (201) to judge11 pm: too few checklists (82) 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
January3.4%3.2%2.5%2.3%
February2.9%2.7%2.6%1.9%
March2.7%2.6%3.1%3.4%
April3.7%3.7%4.1%3.7%
May3.1%3.4%2.6%2.0%
June1.3%1.6%1.8%2.0%
July2.1%2.2%2.1%2.3%
August2.7%2.9%3.8%4.5%
September5.8%6.6%6.7%7.7%
October7.3%6.3%5.4%4.5%
November3.8%3.8%3.2%2.8%
December3.3%3.6%3.4%3.9%

Neighboring states

  • Kansas: arrives early September, 10 weeks later than Nebraska
  • South Dakota: arrives early July, 2 weeks later than Nebraska
  • Iowa: arrives mid June, in the same week than Nebraska
  • Missouri: arrives mid June, in the same week than Nebraska

Common questions

When do Cooper's Hawks arrive in Nebraska?
Cooper's Hawks reach Nebraska in mid June, are common by early August, peak in late September (7.3% of checklists), and most are gone by mid May.
When do Cooper's Hawks leave Nebraska?
Most Cooper's Hawks have left Nebraska by mid May, when reports fall below half their usual rate. Stragglers are still reported until early June.
When is the best time to see a Cooper's Hawk in Nebraska?
The Cooper's Hawk is reported most often in late September, on about 7.3% of Nebraska checklists.
Where in Nebraska are Cooper's Hawks seen most often?
By county, Wayne County, Butler County, and Furnas County have the highest peak reporting rates for the Cooper's Hawk (counties with at least 200 checklists).