WhenToBird

Setophaga virens · Parulidae

When Do Black-throated Green Warblers Arrive in Minnesota?

Adult Black-throated Green Warbler
Photo: Ken Clark, CC BY 4.0 via iNaturalist

Black-throated Green Warblers arrive in Minnesota in early May, peak in mid May (4.6% of checklists), and most are gone by mid July.

When to look

First arrivalsMay 1-7early May
Common byMay 1-7early May
PeakMay 15-21mid May
Most gone byJul 15-21mid July

Best: mid May. First arrivals early May; most are gone by mid July. Peak: on about 4.6% of Minnesota checklists.

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

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

0%2%4%6%Jan 1-7: 0% of 20628 checklistsJan 8-14: 0% of 14594 checklistsJan 15-21: 0% of 14238 checklistsJan 22-31: 0% of 20725 checklistsFeb 1-7: 0% of 14484 checklistsFeb 8-14: 0% of 15988 checklistsFeb 15-21: 0% of 20718 checklistsFeb 22-28: 0% of 15754 checklistsMar 1-7: 0% of 16125 checklistsMar 8-14: 0% of 19035 checklistsMar 15-21: 0% of 19586 checklistsMar 22-31: 0% of 30192 checklistsApr 1-7: 0% of 24262 checklistsApr 8-14: 0% of 30223 checklistsApr 15-21: 0% of 29085 checklistsApr 22-30: 0.1% of 43574 checklistsMay 1-7: 1.5% of 39300 checklistsMay 8-14: 4.7% of 45927 checklistsMay 15-21: 5.1% of 36632 checklistsMay 22-31: 4.0% of 43809 checklistsJun 1-7: 2.8% of 23418 checklistsJun 8-14: 2.6% of 20450 checklistsJun 15-21: 2.7% of 19470 checklistsJun 22-30: 2.2% of 23418 checklistsJul 1-7: 2.1% of 19104 checklistsJul 8-14: 2.3% of 16927 checklistsJul 15-21: 1.3% of 15635 checklistsJul 22-31: 0.9% of 22073 checklistsAug 1-7: 0.8% of 16255 checklistsAug 8-14: 0.8% of 16840 checklistsAug 15-21: 1.3% of 17475 checklistsAug 22-31: 3.2% of 26545 checklistsSep 1-7: 4.0% of 20750 checklistsSep 8-14: 4.0% of 18494 checklistsSep 15-21: 2.9% of 18215 checklistsSep 22-30: 1.6% of 24463 checklistsOct 1-7: 0.5% of 18252 checklistsOct 8-14: 0.1% of 19527 checklistsOct 15-21: 0.1% of 17098 checklistsOct 22-31: 0.1% of 24570 checklistsNov 1-7: 0% of 16744 checklistsNov 8-14: 0% of 13483 checklistsNov 15-21: 0% of 12525 checklistsNov 22-30: 0% of 17023 checklistsDec 1-7: 0.1% of 11645 checklistsDec 8-14: 0.1% of 11567 checklistsDec 15-21: 0% of 13343 checklistsDec 22-31: 0% of 19759 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 Minnesota 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 Minnesota

Best counties

Share of checklists at the peak
  1. Cook CountyBest early June · 533 checklists that week, 14,913 in all37%
  2. Lake CountyBest early July · 392 checklists that week, 19,908 in all30%
  3. Carlton CountyBest late May · 490 checklists that week, 8,150 in all14%
  4. Clearwater CountyBest mid May · 229 checklists that week, 2,315 in all14%
  5. Itasca CountyBest late May · 395 checklists that week, 6,805 in all13%
  6. Dodge CountyBest the second week of September · 34 checklists that week, 1,179 in all13%

Best spots

Share of checklists at the peak
  1. Oberg LakeCook County, best late June · 26 checklists that week, 275 in all88%
  2. Sugarloaf Point State Scientific and Natural AreaCook County, best late May · 28 checklists that week, 337 in all78%
  3. Gooseberry Falls State ParkLake County, best mid June · 35 checklists that week, 954 in all63%
  4. Johnson LakeLake County, best late June · 43 checklists that week, 217 in all47%
  5. Cedar Lake (Sandwick Lake)Itasca County, best late May · 24 checklists that week, 209 in all45%
  6. Stony PointSt. Louis County, best late May · 62 checklists that week, 1,825 in all43%

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

Best time of day

In Minnesota, the Black-throated Green Warbler 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 (349) to judge1 am: too few checklists (331) to judge2 am: too few checklists (286) to judge3 am: too few checklists (364) to judge4 am: too few checklists (863) to judge5 am: too few checklists (7598) to judge6 am: 3.3% of 35775 checklists7 am: 2.1% of 90565 checklists8 am: 1.6% of 110612 checklists9 am: 1.5% of 106128 checklists10 am: 1.3% of 96131 checklists11 am: 1.2% of 83750 checklists12 pm: 1.1% of 76254 checklists1 pm: 1.1% of 73480 checklists2 pm: 1.0% of 73703 checklists3 pm: 0.8% of 75249 checklists4 pm: 0.9% of 68810 checklists5 pm: 0.9% of 51899 checklists6 pm: 1.0% of 38524 checklists7 pm: 0.6% of 25120 checklists8 pm: too few checklists (10568) to judge9 pm: too few checklists (2420) to judge10 pm: too few checklists (748) to judge11 pm: too few checklists (420) 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%0%0.1%
May1.5%4.7%5.1%4.0%
June2.8%2.6%2.7%2.2%
July2.1%2.3%1.3%0.9%
August0.8%0.8%1.3%3.2%
September4.0%4.0%2.9%1.6%
October0.5%0.1%0.1%0.1%
November0%0%0%0%
December0.1%0.1%0%0%

Neighboring states

  • Iowa: arrives late August, 15 weeks later than Minnesota
  • Wisconsin: arrives late April, 1 week earlier than Minnesota
  • Nebraska: arrives late August, 15 weeks later than Minnesota
  • Illinois: arrives mid April, 2 weeks earlier than Minnesota

Common questions

When do Black-throated Green Warblers arrive in Minnesota?
Black-throated Green Warblers arrive in Minnesota in early May, peak in mid May (4.6% of checklists), and most are gone by mid July.
When do Black-throated Green Warblers leave Minnesota?
Most Black-throated Green Warblers have left Minnesota by mid July, when reports fall below half their usual rate.
When is the best time to see a Black-throated Green Warbler in Minnesota?
The Black-throated Green Warbler is reported most often in mid May, on about 4.6% of Minnesota checklists.
Where in Minnesota are Black-throated Green Warblers seen most often?
By county, Cook County, Lake County, and Carlton County have the highest peak reporting rates for the Black-throated Green Warbler (counties with at least 200 checklists).