WhenToBird

Agelaius phoeniceus · Icteridae

When Do Red-winged Blackbirds Arrive in Wisconsin?

Adult male Red-winged Blackbird
Photo: infiniteuniverse, CC0 1.0 via iNaturalist

Red-winged Blackbirds reach Wisconsin in mid February, are common by early March, peak in early May (67% of checklists), and most are gone by mid October.

When to look

First arrivalsFeb 15-21mid February
Common byMar 1-7early March
PeakMay 1-7early May
Most gone byOct 15-21mid October

Best: early May. First arrivals mid February; most are gone by mid October. Peak: on about 67% of Wisconsin checklists.

  1. Jannot usually seen
  2. Febuncommon
  3. Marpeak season
  4. Aprpeak season
  5. Maypeak season
  6. Junpeak season
  7. Julpeak season
  8. Augcommon
  9. Sepuncommon
  10. Octuncommon
  11. Novuncommon
  12. Decnot usually seen

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

0%20%40%60%80%Jan 1-7: 0.6% of 27925 checklistsJan 8-14: 0.6% of 18337 checklistsJan 15-21: 0.6% of 17370 checklistsJan 22-31: 0.7% of 23777 checklistsFeb 1-7: 0.6% of 16656 checklistsFeb 8-14: 1.4% of 18286 checklistsFeb 15-21: 3.7% of 24739 checklistsFeb 22-28: 13% of 20113 checklistsMar 1-7: 35% of 24024 checklistsMar 8-14: 50% of 26722 checklistsMar 15-21: 54% of 27238 checklistsMar 22-31: 58% of 40171 checklistsApr 1-7: 61% of 34961 checklistsApr 8-14: 64% of 39128 checklistsApr 15-21: 64% of 38887 checklistsApr 22-30: 67% of 57231 checklistsMay 1-7: 68% of 55115 checklistsMay 8-14: 66% of 63098 checklistsMay 15-21: 65% of 49821 checklistsMay 22-31: 64% of 56796 checklistsJun 1-7: 62% of 33621 checklistsJun 8-14: 61% of 31282 checklistsJun 15-21: 58% of 30186 checklistsJun 22-30: 57% of 35128 checklistsJul 1-7: 56% of 27088 checklistsJul 8-14: 53% of 23293 checklistsJul 15-21: 52% of 20933 checklistsJul 22-31: 46% of 27595 checklistsAug 1-7: 37% of 19147 checklistsAug 8-14: 27% of 18286 checklistsAug 15-21: 20% of 19195 checklistsAug 22-31: 16% of 28229 checklistsSep 1-7: 13% of 22408 checklistsSep 8-14: 13% of 20857 checklistsSep 15-21: 15% of 20707 checklistsSep 22-30: 18% of 26469 checklistsOct 1-7: 24% of 21069 checklistsOct 8-14: 27% of 21011 checklistsOct 15-21: 27% of 20006 checklistsOct 22-31: 25% of 26362 checklistsNov 1-7: 17% of 18928 checklistsNov 8-14: 9.4% of 17052 checklistsNov 15-21: 4.2% of 16291 checklistsNov 22-30: 1.6% of 20564 checklistsDec 1-7: 0.9% of 15354 checklistsDec 8-14: 1.0% of 16294 checklistsDec 15-21: 0.8% of 21430 checklistsDec 22-31: 0.8% 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. Winnebago CountyBest mid June · 406 checklists that week, 26,460 in all86%
  2. Dodge CountyBest the second week of June · 1051 checklists that week, 34,980 in all86%
  3. Lafayette CountyBest mid June · 94 checklists that week, 1,911 in all85%
  4. Kewaunee CountyBest late June · 192 checklists that week, 9,747 in all78%
  5. Green CountyBest mid June · 140 checklists that week, 4,387 in all78%
  6. Iowa CountyBest late April · 721 checklists that week, 18,836 in all78%

Best spots

Share of checklists at the peak
  1. Schmeeckle Reserve (Johns Lake)Portage County, best late April · 45 checklists that week, 1,322 in all100%
  2. Jenni & Kyle PreserveDane County, best the second week of April · 21 checklists that week, 392 in all100%

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

Best time of day

In Wisconsin, the Red-winged Blackbird is most often listed on checklists started between 5 and 7 am (54% of those checklists).

0%20%40%60%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: 59% of 27016 checklists6 am: 53% of 83973 checklists7 am: 43% of 160717 checklists8 am: 41% of 160531 checklists9 am: 38% of 136968 checklists10 am: 35% of 119110 checklists11 am: 32% of 99116 checklists12 pm: 31% of 85078 checklists1 pm: 30% of 80688 checklists2 pm: 31% of 79140 checklists3 pm: 33% of 78599 checklists4 pm: 40% of 69767 checklists5 pm: 50% of 53229 checklists6 pm: 52% 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
January0.6%0.6%0.6%0.7%
February0.6%1.4%3.7%13%
March35%50%54%58%
April61%64%64%67%
May68%66%65%64%
June62%61%58%57%
July56%53%52%46%
August37%27%20%16%
September13%13%15%18%
October24%27%27%25%
November17%9.4%4.2%1.6%
December0.9%1.0%0.8%0.8%

Neighboring states

  • Illinois: arrives late February, 1 week later than Wisconsin
  • Iowa: arrives mid February, in the same week than Wisconsin
  • Michigan: arrives the second week of February, 1 week earlier than Wisconsin
  • Minnesota: arrives early March, 2 weeks later than Wisconsin

Common questions

When do Red-winged Blackbirds arrive in Wisconsin?
Red-winged Blackbirds reach Wisconsin in mid February, are common by early March, peak in early May (67% of checklists), and most are gone by mid October.
When do Red-winged Blackbirds leave Wisconsin?
Most Red-winged Blackbirds have left Wisconsin 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 Red-winged Blackbird in Wisconsin?
The Red-winged Blackbird is reported most often in early May, on about 67% of Wisconsin checklists.
Where in Wisconsin are Red-winged Blackbirds seen most often?
By county, Winnebago County, Dodge County, and Lafayette County have the highest peak reporting rates for the Red-winged Blackbird (counties with at least 200 checklists).