WhenToBird

Hirundo rustica · Hirundinidae

When Do Barn Swallows Arrive in Michigan?

Adult Barn Swallow
Photo: Diego González Dopico, CC BY 4.0 via iNaturalist

Barn Swallows reach Michigan in the second week of April, are common by late April, peak in early August (27% of checklists), and most are gone by early September.

When to look

First arrivalsApr 8-14the second week of April
Common byApr 22-30late April
PeakAug 1-7early August
Most gone bySep 1-7early September

Best: early August. First arrivals the second week of April; most are gone by early September. Peak: on about 27% of Michigan checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Aprcommon
  5. Maypeak season
  6. Junpeak season
  7. Julpeak season
  8. Augpeak season
  9. Sepcommon
  10. Octnot usually seen
  11. Novnot usually seen
  12. Decnot usually seen

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

0%10%20%30%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: 0.1% of 32118 checklistsMar 22-31: 0.1% of 47777 checklistsApr 1-7: 0.7% of 38557 checklistsApr 8-14: 3.0% of 42207 checklistsApr 15-21: 8.2% of 42759 checklistsApr 22-30: 16% of 64458 checklistsMay 1-7: 21% of 60998 checklistsMay 8-14: 23% of 72091 checklistsMay 15-21: 24% of 59058 checklistsMay 22-31: 23% of 64724 checklistsJun 1-7: 21% of 35990 checklistsJun 8-14: 21% of 32595 checklistsJun 15-21: 21% of 30017 checklistsJun 22-30: 23% of 33988 checklistsJul 1-7: 24% of 28708 checklistsJul 8-14: 26% of 25175 checklistsJul 15-21: 27% of 24084 checklistsJul 22-31: 27% of 33522 checklistsAug 1-7: 28% of 25098 checklistsAug 8-14: 28% of 24353 checklistsAug 15-21: 27% of 25059 checklistsAug 22-31: 19% of 37489 checklistsSep 1-7: 9.8% of 28410 checklistsSep 8-14: 4.4% of 27887 checklistsSep 15-21: 1.2% of 26614 checklistsSep 22-30: 0.6% of 32557 checklistsOct 1-7: 0.2% of 25844 checklistsOct 8-14: 0.1% of 27741 checklistsOct 15-21: 0.1% of 24693 checklistsOct 22-31: 0.1% of 32460 checklistsNov 1-7: 0.1% of 23660 checklistsNov 8-14: 0.1% of 21542 checklistsNov 15-21: 0.1% 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. Branch CountyBest mid August · 33 checklists that week, 2,279 in all70%
  2. Gratiot CountyBest early August · 145 checklists that week, 5,892 in all69%
  3. Monroe CountyBest the second week of August · 499 checklists that week, 22,078 in all67%
  4. Bay CountyBest mid June · 402 checklists that week, 16,522 in all61%
  5. Hillsdale CountyBest mid August · 150 checklists that week, 9,510 in all60%
  6. Clinton CountyBest the second week of August · 126 checklists that week, 10,597 in all52%

Best spots

Share of checklists at the peak
  1. North Bay ParkWashtenaw County, best late June · 24 checklists that week, 2,958 in all100%
  2. Houghton Lake Flats North Flooding State Wildlife Management AreaRoscommon County, best the second week of June · 67 checklists that week, 1,067 in all99%
  3. Southeast Michigan Land Conservancy PreserveWashtenaw County, best the second week of August · 20 checklists that week, 1,157 in all98%
  4. Simon BranchGenesee County, best the second week of August · 31 checklists that week, 278 in all97%
  5. Robert H. Long ParkOakland County, best the second week of June · 138 checklists that week, 5,994 in all96%

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

Best time of day

In Michigan, the Barn Swallow is most often listed on checklists started between 6 and 8 pm (16% of those checklists).

0%5%10%15%20%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: 18% of 39298 checklists7 am: 13% of 120344 checklists8 am: 11% of 180109 checklists9 am: 10% of 171966 checklists10 am: 9.8% of 156332 checklists11 am: 9.0% of 134964 checklists12 pm: 8.5% of 120967 checklists1 pm: 8.4% of 113852 checklists2 pm: 8.0% of 110773 checklists3 pm: 7.9% of 105530 checklists4 pm: 8.2% of 100958 checklists5 pm: 11% of 80085 checklists6 pm: 15% of 62883 checklists7 pm: 18% 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%0.1%0.1%
April0.7%3.0%8.2%16%
May21%23%24%23%
June21%21%21%23%
July24%26%27%27%
August28%28%27%19%
September9.8%4.4%1.2%0.6%
October0.2%0.1%0.1%0.1%
November0.1%0.1%0.1%0%
December0%0%0%0%

Neighboring states

  • Ohio: arrives early April, 1 week earlier than Michigan
  • Indiana: arrives early April, 1 week earlier than Michigan
  • Illinois: arrives the second week of April, in the same week than Michigan
  • Wisconsin: arrives the second week of April, in the same week than Michigan

Common questions

When do Barn Swallows arrive in Michigan?
Barn Swallows reach Michigan in the second week of April, are common by late April, peak in early August (27% of checklists), and most are gone by early September.
When do Barn Swallows leave Michigan?
Most Barn Swallows have left Michigan by early September, when reports fall below half their usual rate. Stragglers are still reported until the second week of September.
When is the best time to see a Barn Swallow in Michigan?
The Barn Swallow is reported most often in early August, on about 27% of Michigan checklists.
Where in Michigan are Barn Swallows seen most often?
By county, Branch County, Gratiot County, and Monroe County have the highest peak reporting rates for the Barn Swallow (counties with at least 200 checklists).