WhenToBird

Empidonax virescens · Tyrannidae

When Do Acadian Flycatchers Arrive in Michigan?

Adult Acadian Flycatcher
Photo: Amber M. King, CC BY 4.0 via iNaturalist

Acadian Flycatchers reach Michigan in the second week of May, are common by mid May, peak in early June (3.8% of checklists), and most are gone by late July.

When to look

First arrivalsMay 8-14the second week of May
Common byMay 15-21mid May
PeakJun 1-7early June
Most gone byJul 22-31late July

Best: early June. First arrivals the second week of May; most are gone by late July. Peak: on about 3.8% of Michigan checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Aprnot usually seen
  5. Maypeak season
  6. Junpeak season
  7. Julcommon
  8. Auguncommon
  9. Seprare
  10. Octnot usually seen
  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 38160 checklistsJan 8-14: 0% of 24696 checklistsJan 15-21: 0% of 23771 checklistsJan 22-31: 0% of 31347 checklistsFeb 1-7: 0% of 23225 checklistsFeb 8-14: 0% of 27398 checklistsFeb 15-21: 0% of 36606 checklistsFeb 22-28: 0% of 27127 checklistsMar 1-7: 0% of 29700 checklistsMar 8-14: 0% of 31587 checklistsMar 15-21: 0% of 32118 checklistsMar 22-31: 0% of 47777 checklistsApr 1-7: 0% of 38557 checklistsApr 8-14: 0% of 42207 checklistsApr 15-21: 0% of 42759 checklistsApr 22-30: 0.1% of 64458 checklistsMay 1-7: 0.1% of 60998 checklistsMay 8-14: 1.0% of 72091 checklistsMay 15-21: 2.7% of 59058 checklistsMay 22-31: 3.7% of 64724 checklistsJun 1-7: 3.9% of 35990 checklistsJun 8-14: 3.7% of 32595 checklistsJun 15-21: 3.1% of 30017 checklistsJun 22-30: 3.0% of 33988 checklistsJul 1-7: 3.0% of 28708 checklistsJul 8-14: 2.4% of 25175 checklistsJul 15-21: 2.0% of 24084 checklistsJul 22-31: 1.7% of 33522 checklistsAug 1-7: 1.3% of 25098 checklistsAug 8-14: 0.8% of 24353 checklistsAug 15-21: 0.5% of 25059 checklistsAug 22-31: 0.4% of 37489 checklistsSep 1-7: 0.3% of 28410 checklistsSep 8-14: 0.2% of 27887 checklistsSep 15-21: 0.1% of 26614 checklistsSep 22-30: 0.1% of 32557 checklistsOct 1-7: 0.1% of 25844 checklistsOct 8-14: 0% of 27741 checklistsOct 15-21: 0% of 24693 checklistsOct 22-31: 0% of 32460 checklistsNov 1-7: 0% of 23660 checklistsNov 8-14: 0% of 21542 checklistsNov 15-21: 0% of 19922 checklistsNov 22-30: 0% of 25069 checklistsDec 1-7: 0% of 18272 checklistsDec 8-14: 0% of 18961 checklistsDec 15-21: 0% of 24171 checklistsDec 22-31: 0% of 30908 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 Michigan 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 Michigan

Best counties

Share of checklists at the peak
  1. Cass CountyBest the second week of June · 155 checklists that week, 7,456 in all19%
  2. Barry CountyBest late June · 521 checklists that week, 29,465 in all16%
  3. Hillsdale CountyBest early June · 253 checklists that week, 9,510 in all16%
  4. Berrien CountyBest the second week of June · 1057 checklists that week, 54,650 in all15%
  5. Allegan CountyBest the second week of June · 609 checklists that week, 28,650 in all14%
  6. St. Joseph CountyBest late May · 255 checklists that week, 6,972 in all14%

Best spots

Share of checklists at the peak
  1. Dolan Nature SanctuaryKent County, best early June · 26 checklists that week, 464 in all93%
  2. Allegan State Game Area (Swan Creek Pond)Allegan County, best early June · 29 checklists that week, 167 in all77%
  3. Sullivan LakeWashtenaw County, best early June · 20 checklists that week, 513 in all75%
  4. Pinckney Recreation AreaLivingston County, best late May · 32 checklists that week, 260 in all74%
  5. Aman ParkOttawa County, best early June · 32 checklists that week, 594 in all74%

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

Best time of day

In Michigan, the Acadian Flycatcher is most often listed on checklists started between 6 and 8 am (1.7% of those checklists).

0%1%2%3%12 am: too few checklists (712) to judge1 am: too few checklists (592) to judge2 am: too few checklists (532) to judge3 am: too few checklists (516) to judge4 am: too few checklists (1592) to judge5 am: too few checklists (6849) to judge6 am: 2.2% of 39298 checklists7 am: 1.5% of 120344 checklists8 am: 1.2% of 180109 checklists9 am: 1.1% of 171966 checklists10 am: 0.9% of 156332 checklists11 am: 0.7% of 134964 checklists12 pm: 0.5% of 120967 checklists1 pm: 0.5% of 113852 checklists2 pm: 0.4% of 110773 checklists3 pm: 0.4% of 105530 checklists4 pm: 0.3% of 100958 checklists5 pm: 0.4% of 80085 checklists6 pm: 0.5% of 62883 checklists7 pm: 0.5% of 44912 checklists8 pm: too few checklists (21062) to judge9 pm: too few checklists (5920) to judge10 pm: too few checklists (1629) to judge11 pm: too few checklists (775) 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%
May0.1%1.0%2.7%3.7%
June3.9%3.7%3.1%3.0%
July3.0%2.4%2.0%1.7%
August1.3%0.8%0.5%0.4%
September0.3%0.2%0.1%0.1%
October0.1%0%0%0%
November0%0%0%0%
December0%0%0%0%

Neighboring states

  • Ohio: arrives early May, 1 week earlier than Michigan
  • Indiana: arrives late April, 2 weeks earlier than Michigan
  • Illinois: arrives early May, 1 week earlier than Michigan
  • Wisconsin: arrives mid May, 1 week later than Michigan

Common questions

When do Acadian Flycatchers arrive in Michigan?
Acadian Flycatchers reach Michigan in the second week of May, are common by mid May, peak in early June (3.8% of checklists), and most are gone by late July.
When do Acadian Flycatchers leave Michigan?
Most Acadian Flycatchers have left Michigan by late July, when reports fall below half their usual rate. Stragglers are still reported until early August.
When is the best time to see a Acadian Flycatcher in Michigan?
The Acadian Flycatcher is reported most often in early June, on about 3.8% of Michigan checklists.
Where in Michigan are Acadian Flycatchers seen most often?
By county, Cass County, Barry County, and Hillsdale County have the highest peak reporting rates for the Acadian Flycatcher (counties with at least 200 checklists).