WhenToBird

Empidonax virescens · Tyrannidae

When Do Acadian Flycatchers Arrive in Missouri?

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

Acadian Flycatchers reach Missouri in late April, are common by early May, peak in early June (12% of checklists), and most are gone by early August.

When to look

First arrivalsApr 22-30late April
Common byMay 1-7early May
PeakJun 1-7early June
Most gone byAug 1-7early August

Best: early June. First arrivals late April; most are gone by early August. Peak: on about 12% of Missouri checklists.

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

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

0%5%10%15%Jan 1-7: 0% of 12628 checklistsJan 8-14: 0% of 9076 checklistsJan 15-21: 0% of 8790 checklistsJan 22-31: 0% of 11986 checklistsFeb 1-7: 0% of 8987 checklistsFeb 8-14: 0% of 10394 checklistsFeb 15-21: 0% of 15472 checklistsFeb 22-28: 0% of 9917 checklistsMar 1-7: 0% of 9877 checklistsMar 8-14: 0% of 9570 checklistsMar 15-21: 0% of 10274 checklistsMar 22-31: 0% of 16156 checklistsApr 1-7: 0% of 12774 checklistsApr 8-14: 0% of 14048 checklistsApr 15-21: 0.1% of 14894 checklistsApr 22-30: 1.2% of 23288 checklistsMay 1-7: 4.7% of 22645 checklistsMay 8-14: 9.4% of 21384 checklistsMay 15-21: 11% of 13989 checklistsMay 22-31: 12% of 15784 checklistsJun 1-7: 12% of 9691 checklistsJun 8-14: 11% of 9036 checklistsJun 15-21: 10% of 7907 checklistsJun 22-30: 9.3% of 9831 checklistsJul 1-7: 9.8% of 8008 checklistsJul 8-14: 8.6% of 7202 checklistsJul 15-21: 7.4% of 7151 checklistsJul 22-31: 6.0% of 9833 checklistsAug 1-7: 4.6% of 7639 checklistsAug 8-14: 3.9% of 7507 checklistsAug 15-21: 3.3% of 7429 checklistsAug 22-31: 2.8% of 11182 checklistsSep 1-7: 3.3% of 9471 checklistsSep 8-14: 4.0% of 8501 checklistsSep 15-21: 2.9% of 8169 checklistsSep 22-30: 0.3% of 11572 checklistsOct 1-7: 0.1% of 9028 checklistsOct 8-14: 0% of 9413 checklistsOct 15-21: 0% of 8656 checklistsOct 22-31: 0% of 11625 checklistsNov 1-7: 0% of 8627 checklistsNov 8-14: 0% of 8284 checklistsNov 15-21: 0% of 8075 checklistsNov 22-30: 0% of 10430 checklistsDec 1-7: 0% of 7870 checklistsDec 8-14: 0% of 7567 checklistsDec 15-21: 0% of 9696 checklistsDec 22-31: 0% of 13142 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 Missouri 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 Missouri

Best counties

Share of checklists at the peak
  1. Wayne CountyBest mid July · 37 checklists that week, 1,250 in all64%
  2. Douglas CountyBest the second week of June · 11 checklists that week, 343 in all59%
  3. Oregon CountyBest the second week of June · 32 checklists that week, 1,145 in all57%
  4. Madison CountyBest late July · 12 checklists that week, 581 in all47%
  5. Stoddard CountyBest late May · 50 checklists that week, 2,301 in all45%
  6. Carter CountyBest early July · 29 checklists that week, 1,547 in all44%

Best spots

Share of checklists at the peak
  1. Weldon Spring Conservation AreaSt. Charles County, best the second week of July · 24 checklists that week, 1,281 in all94%
  2. Sam A. Baker State ParkWayne County, best mid July · 22 checklists that week, 147 in all82%
  3. Rock Bridge Memorial State Park (east)Boone County, best mid May · 27 checklists that week, 257 in all81%
  4. Lincoln Hills Natural AreaLincoln County, best late May · 22 checklists that week, 639 in all72%
  5. Rock Bridge Memorial State ParkBoone County, best mid May · 45 checklists that week, 1,012 in all71%
  6. Mdc Nature Center/ North CountyCape Girardeau County, best late June · 33 checklists that week, 1,627 in all69%

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

Best time of day

In Missouri, the Acadian Flycatcher is most often listed on checklists started between 6 and 8 am (5.3% of those checklists).

0%2%4%6%8%12 am: too few checklists (205) to judge1 am: too few checklists (179) to judge2 am: too few checklists (204) to judge3 am: too few checklists (216) to judge4 am: too few checklists (630) to judge5 am: too few checklists (5072) to judge6 am: 7.4% of 27231 checklists7 am: 4.4% of 64162 checklists8 am: 3.5% of 67854 checklists9 am: 3.2% of 56515 checklists10 am: 2.9% of 47496 checklists11 am: 2.2% of 38845 checklists12 pm: 2.0% of 33383 checklists1 pm: 1.7% of 32503 checklists2 pm: 1.5% of 32615 checklists3 pm: 1.2% of 32514 checklists4 pm: 1.4% of 30274 checklists5 pm: 1.5% of 23446 checklists6 pm: 1.8% of 16374 checklists7 pm: too few checklists (10236) to judge8 pm: too few checklists (3133) to judge9 pm: too few checklists (722) to judge10 pm: too few checklists (405) to judge11 pm: too few checklists (261) 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%0.1%1.2%
May4.7%9.4%11%12%
June12%11%10%9.3%
July9.8%8.6%7.4%6.0%
August4.6%3.9%3.3%2.8%
September3.3%4.0%2.9%0.3%
October0.1%0%0%0%
November0%0%0%0%
December0%0%0%0%

Neighboring states

  • Arkansas: arrives mid April, 1 week earlier than Missouri
  • Iowa: arrives the second week of May, 2 weeks later than Missouri
  • Kansas: arrives early May, 1 week later than Missouri
  • Illinois: arrives early May, 1 week later than Missouri

Common questions

When do Acadian Flycatchers arrive in Missouri?
Acadian Flycatchers reach Missouri in late April, are common by early May, peak in early June (12% of checklists), and most are gone by early August.
When do Acadian Flycatchers leave Missouri?
Most Acadian Flycatchers have left Missouri by early August, when reports fall below half their usual rate. Stragglers are still reported until mid September.
When is the best time to see a Acadian Flycatcher in Missouri?
The Acadian Flycatcher is reported most often in early June, on about 12% of Missouri checklists.
Where in Missouri are Acadian Flycatchers seen most often?
By county, Wayne County, Douglas County, and Oregon County have the highest peak reporting rates for the Acadian Flycatcher (counties with at least 200 checklists).