WhenToBird

Tachycineta bicolor · Hirundinidae

When Do Tree Swallows Arrive in Missouri?

Adult Tree Swallow
Photo: Carter Dorscht, CC0 1.0 via iNaturalist

Tree Swallows reach Missouri in early March, are common by the second week of March, peak in mid April (15% of checklists), and most are gone by late October.

When to look

First arrivalsMar 1-7early March
Common byMar 8-14the second week of March
PeakApr 15-21mid April
Most gone byOct 22-31late October

Best: mid April. First arrivals early March; most are gone by late October. Peak: on about 15% of Missouri checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marcommon
  4. Aprpeak season
  5. Maypeak season
  6. Juncommon
  7. Juluncommon
  8. Auguncommon
  9. Sepuncommon
  10. Octuncommon
  11. Novuncommon
  12. Decnot usually seen

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

0%5%10%15%20%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: 0.1% of 10394 checklistsFeb 15-21: 0% of 15472 checklistsFeb 22-28: 0.1% of 9917 checklistsMar 1-7: 0.5% of 9877 checklistsMar 8-14: 2.5% of 9570 checklistsMar 15-21: 5.8% of 10274 checklistsMar 22-31: 9.6% of 16156 checklistsApr 1-7: 13% of 12774 checklistsApr 8-14: 13% of 14048 checklistsApr 15-21: 17% of 14894 checklistsApr 22-30: 14% of 23288 checklistsMay 1-7: 12% of 22645 checklistsMay 8-14: 9.8% of 21384 checklistsMay 15-21: 10% of 13989 checklistsMay 22-31: 9.5% of 15784 checklistsJun 1-7: 8.3% of 9691 checklistsJun 8-14: 8.0% of 9036 checklistsJun 15-21: 7.6% of 7907 checklistsJun 22-30: 6.2% of 9831 checklistsJul 1-7: 5.5% of 8008 checklistsJul 8-14: 4.0% of 7202 checklistsJul 15-21: 4.1% of 7151 checklistsJul 22-31: 3.8% of 9833 checklistsAug 1-7: 4.2% of 7639 checklistsAug 8-14: 3.7% of 7507 checklistsAug 15-21: 3.9% of 7429 checklistsAug 22-31: 3.4% of 11182 checklistsSep 1-7: 2.8% of 9471 checklistsSep 8-14: 2.9% of 8501 checklistsSep 15-21: 2.0% of 8169 checklistsSep 22-30: 2.8% of 11572 checklistsOct 1-7: 4.1% of 9028 checklistsOct 8-14: 5.9% of 9413 checklistsOct 15-21: 5.0% of 8656 checklistsOct 22-31: 4.1% of 11625 checklistsNov 1-7: 2.2% of 8627 checklistsNov 8-14: 0.4% of 8284 checklistsNov 15-21: 0.1% of 8075 checklistsNov 22-30: 0.1% of 10430 checklistsDec 1-7: 0.1% of 7870 checklistsDec 8-14: 0.1% of 7567 checklistsDec 15-21: 0% of 9696 checklistsDec 22-31: 0.1% 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. Perry CountyBest early April · 31 checklists that week, 1,583 in all47%
  2. Nodaway CountyBest early October · 23 checklists that week, 834 in all46%
  3. DeKalb CountyBest mid April · 16 checklists that week, 422 in all45%
  4. Lewis CountyBest mid April · 21 checklists that week, 1,047 in all45%
  5. Holt CountyBest late April · 50 checklists that week, 1,665 in all39%
  6. Cole CountyBest late March · 183 checklists that week, 6,085 in all39%

Best spots

Share of checklists at the peak
  1. Little Prairie Conservation AreaPhelps County, best early May · 35 checklists that week, 830 in all95%
  2. Binder Conservation LandCole County, best early April · 47 checklists that week, 1,541 in all95%
  3. Port Hudson Lake Conservation AreaFranklin County, best early May · 24 checklists that week, 457 in all90%
  4. Marais Temps Clair Conservation AreaSt. Charles County, best late April · 33 checklists that week, 680 in all86%
  5. Lake Springfield ParkGreene County, best mid April · 102 checklists that week, 2,219 in all85%
  6. Alton SloughSt. Charles County, best mid April · 187 checklists that week, 7,626 in all77%

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

Best time of day

In Missouri, the Tree Swallow is most often listed on checklists started between 9 and 11 am (6.0% 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: 6.7% of 27231 checklists7 am: 5.4% of 64162 checklists8 am: 5.4% of 67854 checklists9 am: 6.2% of 56515 checklists10 am: 5.9% of 47496 checklists11 am: 5.4% of 38845 checklists12 pm: 5.0% of 33383 checklists1 pm: 4.8% of 32503 checklists2 pm: 4.5% of 32615 checklists3 pm: 4.3% of 32514 checklists4 pm: 4.6% of 30274 checklists5 pm: 5.4% of 23446 checklists6 pm: 5.8% 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%0.1%0%0.1%
March0.5%2.5%5.8%9.6%
April13%13%17%14%
May12%9.8%10%9.5%
June8.3%8.0%7.6%6.2%
July5.5%4.0%4.1%3.8%
August4.2%3.7%3.9%3.4%
September2.8%2.9%2.0%2.8%
October4.1%5.9%5.0%4.1%
November2.2%0.4%0.1%0.1%
December0.1%0.1%0%0.1%

Neighboring states

  • Arkansas: arrives early March, in the same week than Missouri
  • Iowa: arrives mid March, 2 weeks later than Missouri
  • Kansas: arrives the second week of March, 1 week later than Missouri
  • Illinois: arrives the second week of March, 1 week later than Missouri

Common questions

When do Tree Swallows arrive in Missouri?
Tree Swallows reach Missouri in early March, are common by the second week of March, peak in mid April (15% of checklists), and most are gone by late October.
When do Tree Swallows leave Missouri?
Most Tree Swallows have left Missouri by late October, when reports fall below half their usual rate. Stragglers are still reported until early November.
When is the best time to see a Tree Swallow in Missouri?
The Tree Swallow is reported most often in mid April, on about 15% of Missouri checklists.
Where in Missouri are Tree Swallows seen most often?
By county, Perry County, Nodaway County, and DeKalb County have the highest peak reporting rates for the Tree Swallow (counties with at least 200 checklists).