WhenToBird

Buteo platypterus · Accipitridae

When Do Broad-winged Hawks Arrive in Wisconsin?

Adult Broad-winged Hawk
Photo: Donald Davesne, CC BY 4.0 via iNaturalist

Broad-winged Hawks arrive in Wisconsin in mid April, peak in early May (3.2% of checklists), and most are gone by late September.

When to look

First arrivalsApr 15-21mid April
Common byApr 15-21mid April
PeakMay 1-7early May
Most gone bySep 22-30late September

Best: early May. First arrivals mid April; most are gone by late September. Peak: on about 3.2% of Wisconsin checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Aprpeak season
  5. Maypeak season
  6. Juncommon
  7. Julpeak season
  8. Augcommon
  9. Sepcommon
  10. Octuncommon
  11. Novnot usually seen
  12. Decnot usually seen

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

0%1%2%3%4%Jan 1-7: 0% of 27925 checklistsJan 8-14: 0% of 18337 checklistsJan 15-21: 0% of 17370 checklistsJan 22-31: 0% of 23777 checklistsFeb 1-7: 0% of 16656 checklistsFeb 8-14: 0% of 18286 checklistsFeb 15-21: 0% of 24739 checklistsFeb 22-28: 0% of 20113 checklistsMar 1-7: 0% of 24024 checklistsMar 8-14: 0% of 26722 checklistsMar 15-21: 0% of 27238 checklistsMar 22-31: 0% of 40171 checklistsApr 1-7: 0% of 34961 checklistsApr 8-14: 0.2% of 39128 checklistsApr 15-21: 2.0% of 38887 checklistsApr 22-30: 3.5% of 57231 checklistsMay 1-7: 3.7% of 55115 checklistsMay 8-14: 2.7% of 63098 checklistsMay 15-21: 2.5% of 49821 checklistsMay 22-31: 2.6% of 56796 checklistsJun 1-7: 2.0% of 33621 checklistsJun 8-14: 1.9% of 31282 checklistsJun 15-21: 1.9% of 30186 checklistsJun 22-30: 2.2% of 35128 checklistsJul 1-7: 2.7% of 27088 checklistsJul 8-14: 2.7% of 23293 checklistsJul 15-21: 2.4% of 20933 checklistsJul 22-31: 2.2% of 27595 checklistsAug 1-7: 2.3% of 19147 checklistsAug 8-14: 2.5% of 18286 checklistsAug 15-21: 2.0% of 19195 checklistsAug 22-31: 2.4% of 28229 checklistsSep 1-7: 2.4% of 22408 checklistsSep 8-14: 2.1% of 20857 checklistsSep 15-21: 2.6% of 20707 checklistsSep 22-30: 1.8% of 26469 checklistsOct 1-7: 0.8% of 21069 checklistsOct 8-14: 0.2% of 21011 checklistsOct 15-21: 0.1% of 20006 checklistsOct 22-31: 0.1% of 26362 checklistsNov 1-7: 0.1% of 18928 checklistsNov 8-14: 0% of 17052 checklistsNov 15-21: 0% of 16291 checklistsNov 22-30: 0% of 20564 checklistsDec 1-7: 0% of 15354 checklistsDec 8-14: 0% of 16294 checklistsDec 15-21: 0% of 21430 checklistsDec 22-31: 0% of 26314 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 Wisconsin 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 Wisconsin

Best counties

Share of checklists at the peak
  1. Washburn CountyBest early May · 274 checklists that week, 7,099 in all20%
  2. Monroe CountyBest late September · 54 checklists that week, 3,836 in all19%
  3. Forest CountyBest the second week of September · 138 checklists that week, 7,461 in all17%
  4. Menominee CountyBest the second week of August · 12 checklists that week, 745 in all14%
  5. Vilas CountyBest mid August · 340 checklists that week, 16,082 in all13%
  6. Rusk CountyBest the second week of August · 66 checklists that week, 5,768 in all13%

Best spots

Share of checklists at the peak
  1. Kettle Moraine State Forest-Northern Unit-IansrFond du Lac County, best early May · 31 checklists that week, 444 in all40%
  2. Jackson HarborDoor County, best late May · 20 checklists that week, 317 in all36%
  3. Statenaker LakeVilas County, best the second week of July · 38 checklists that week, 2,030 in all33%
  4. Coulee Experimental ForestLa Crosse County, best late April · 20 checklists that week, 234 in all33%
  5. Hoffman Hills Recreation AreaDunn County, best late June · 25 checklists that week, 615 in all32%

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

Best time of day

In Wisconsin, the Broad-winged Hawk is most often listed on checklists started between 5 and 7 am (2.0% of those checklists).

0%1%2%3%12 am: too few checklists (993) to judge1 am: too few checklists (844) to judge2 am: too few checklists (839) to judge3 am: too few checklists (1488) to judge4 am: too few checklists (5344) to judge5 am: 2.1% of 27016 checklists6 am: 1.9% of 83973 checklists7 am: 1.6% of 160717 checklists8 am: 1.6% of 160531 checklists9 am: 1.8% of 136968 checklists10 am: 1.7% of 119110 checklists11 am: 1.5% of 99116 checklists12 pm: 1.3% of 85078 checklists1 pm: 1.2% of 80688 checklists2 pm: 1.1% of 79140 checklists3 pm: 1.0% of 78599 checklists4 pm: 0.9% of 69767 checklists5 pm: 0.9% of 53229 checklists6 pm: 0.7% of 38769 checklists7 pm: too few checklists (24396) to judge8 pm: too few checklists (10155) to judge9 pm: too few checklists (4990) to judge10 pm: too few checklists (2463) to judge11 pm: too few checklists (1281) 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%0%0%0%
February0%0%0%0%
March0%0%0%0%
April0%0.2%2.0%3.5%
May3.7%2.7%2.5%2.6%
June2.0%1.9%1.9%2.2%
July2.7%2.7%2.4%2.2%
August2.3%2.5%2.0%2.4%
September2.4%2.1%2.6%1.8%
October0.8%0.2%0.1%0.1%
November0.1%0%0%0%
December0%0%0%0%

Neighboring states

  • Illinois: arrives the second week of April, 1 week earlier than Wisconsin
  • Iowa: arrives the second week of August, 15 weeks later than Wisconsin
  • Michigan: arrives mid April, in the same week than Wisconsin
  • Minnesota: arrives mid April, in the same week than Wisconsin

Common questions

When do Broad-winged Hawks arrive in Wisconsin?
Broad-winged Hawks arrive in Wisconsin in mid April, peak in early May (3.2% of checklists), and most are gone by late September.
When do Broad-winged Hawks leave Wisconsin?
Most Broad-winged Hawks have left Wisconsin by late September, when reports fall below half their usual rate. Stragglers are still reported until early October.
When is the best time to see a Broad-winged Hawk in Wisconsin?
The Broad-winged Hawk is reported most often in early May, on about 3.2% of Wisconsin checklists.
Where in Wisconsin are Broad-winged Hawks seen most often?
By county, Washburn County, Monroe County, and Forest County have the highest peak reporting rates for the Broad-winged Hawk (counties with at least 200 checklists).