WhenToBird

Euphagus cyanocephalus · Icteridae

When Do Brewer's Blackbirds Arrive in South Dakota?

Adult Brewer's Blackbird
Photo: William Harmon, CC BY 4.0 via iNaturalist

Brewer's Blackbirds arrive in South Dakota in the second week of April, peak in mid June (4.5% of checklists), and most are gone by the second week of November.

When to look

First arrivalsApr 8-14the second week of April
Common byApr 8-14the second week of April
PeakJun 15-21mid June
Most gone byNov 8-14the second week of November

Best: mid June. First arrivals the second week of April; most are gone by the second week of November. Peak: on about 4.5% of South Dakota checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marrare
  4. Apruncommon
  5. Maycommon
  6. Junpeak season
  7. Julpeak season
  8. Augcommon
  9. Sepcommon
  10. Octuncommon
  11. Novuncommon
  12. Decnot usually seen

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

0%2%4%6%Jan 1-7: 0% of 1699 checklistsJan 8-14: 0.1% of 967 checklistsJan 15-21: 0% of 893 checklistsJan 22-31: 0% of 1338 checklistsFeb 1-7: 0.1% of 898 checklistsFeb 8-14: 0% of 1013 checklistsFeb 15-21: 0% of 1650 checklistsFeb 22-28: 0% of 1011 checklistsMar 1-7: 0.2% of 1304 checklistsMar 8-14: 0% of 1447 checklistsMar 15-21: 0.1% of 1524 checklistsMar 22-31: 0.3% of 2850 checklistsApr 1-7: 0.4% of 2170 checklistsApr 8-14: 1.2% of 2259 checklistsApr 15-21: 1.2% of 2578 checklistsApr 22-30: 1.6% of 3858 checklistsMay 1-7: 1.4% of 3532 checklistsMay 8-14: 2.1% of 4498 checklistsMay 15-21: 2.6% of 4211 checklistsMay 22-31: 2.8% of 5094 checklistsJun 1-7: 3.2% of 3279 checklistsJun 8-14: 3.7% of 3503 checklistsJun 15-21: 4.8% of 2861 checklistsJun 22-30: 5.0% of 3893 checklistsJul 1-7: 3.3% of 2666 checklistsJul 8-14: 2.9% of 2554 checklistsJul 15-21: 2.0% of 2412 checklistsJul 22-31: 1.5% of 2746 checklistsAug 1-7: 1.2% of 1842 checklistsAug 8-14: 0.9% of 1899 checklistsAug 15-21: 2.4% of 1757 checklistsAug 22-31: 2.0% of 2464 checklistsSep 1-7: 1.8% of 1894 checklistsSep 8-14: 2.0% of 1794 checklistsSep 15-21: 1.3% of 1671 checklistsSep 22-30: 2.2% of 2085 checklistsOct 1-7: 1.5% of 1429 checklistsOct 8-14: 0.8% of 1441 checklistsOct 15-21: 0.8% of 1330 checklistsOct 22-31: 1.6% of 1471 checklistsNov 1-7: 2.1% of 1168 checklistsNov 8-14: 0.7% of 1068 checklistsNov 15-21: 0.2% of 985 checklistsNov 22-30: 0.4% of 1108 checklistsDec 1-7: 0% of 890 checklistsDec 8-14: 0.1% of 957 checklistsDec 15-21: 0.1% of 1246 checklistsDec 22-31: 0.1% of 1514 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 South Dakota 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 South Dakota

Best counties

Share of checklists at the peak
  1. Butte CountyBest late June · 62 checklists that week, 987 in all20%
  2. Meade CountyBest early July · 45 checklists that week, 1,338 in all19%
  3. Harding CountyBest early July · 38 checklists that week, 1,088 in all19%
  4. Perkins CountyBest late June · 26 checklists that week, 413 in all16%
  5. McPherson CountyBest the second week of June · 11 checklists that week, 729 in all14%
  6. Jones CountyBest the second week of September · 11 checklists that week, 425 in all13%

Best spots

Share of checklists at the peak
  1. Prairie Dog CanyonCuster County, best late May · 20 checklists that week, 184 in all36%
  2. Wind Cave National ParkCuster County, best late May · 34 checklists that week, 475 in all15%
  3. Jewel Cave National MonumentCuster County, best late June · 22 checklists that week, 308 in all15%
  4. Badlands National Park (west)Jackson County, best the second week of June · 21 checklists that week, 277 in all11%
  5. Alabaugh CanyonFall River County, best the second week of May · 38 checklists that week, 206 in all6.4%
  6. Custer State ParkCuster County, best mid May · 24 checklists that week, 216 in all5.8%

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

Best time of day

In South Dakota, the Brewer's Blackbird is most often listed on checklists started between 6 and 8 am (2.5% of those checklists).

0%1%2%3%4%12 am: too few checklists (49) to judge1 am: too few checklists (44) to judge2 am: too few checklists (33) to judge3 am: too few checklists (59) to judge4 am: too few checklists (227) to judge5 am: too few checklists (1080) to judge6 am: 3.3% of 3387 checklists7 am: 2.1% of 7718 checklists8 am: 1.6% of 10342 checklists9 am: 1.5% of 10758 checklists10 am: 1.9% of 9123 checklists11 am: 1.4% of 7814 checklists12 pm: 1.3% of 6876 checklists1 pm: 1.1% of 6801 checklists2 pm: 1.8% of 6673 checklists3 pm: 1.4% of 6344 checklists4 pm: 1.8% of 6412 checklists5 pm: 1.6% of 5570 checklists6 pm: 2.0% of 4276 checklists7 pm: 2.1% of 3183 checklists8 pm: too few checklists (1499) to judge9 pm: too few checklists (329) to judge10 pm: too few checklists (82) to judge11 pm: too few checklists (42) 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%0.1%0%0%
February0.1%0%0%0%
March0.2%0%0.1%0.3%
April0.4%1.2%1.2%1.6%
May1.4%2.1%2.6%2.8%
June3.2%3.7%4.8%5.0%
July3.3%2.9%2.0%1.5%
August1.2%0.9%2.4%2.0%
September1.8%2.0%1.3%2.2%
October1.5%0.8%0.8%1.6%
November2.1%0.7%0.2%0.4%
December0%0.1%0.1%0.1%

Neighboring states

  • Nebraska: arrives the second week of March, 4 weeks earlier than South Dakota
  • North Dakota: arrives mid April, 1 week later than South Dakota
  • Minnesota: arrives late March, 2 weeks earlier than South Dakota
  • Kansas: arrives the second week of October, 24 weeks earlier than South Dakota

Common questions

When do Brewer's Blackbirds arrive in South Dakota?
Brewer's Blackbirds arrive in South Dakota in the second week of April, peak in mid June (4.5% of checklists), and most are gone by the second week of November.
When do Brewer's Blackbirds leave South Dakota?
Most Brewer's Blackbirds have left South Dakota by the second week of November, when reports fall below half their usual rate.
When is the best time to see a Brewer's Blackbird in South Dakota?
The Brewer's Blackbird is reported most often in mid June, on about 4.5% of South Dakota checklists.
Where in South Dakota are Brewer's Blackbirds seen most often?
By county, Butte County, Meade County, and Harding County have the highest peak reporting rates for the Brewer's Blackbird (counties with at least 200 checklists).