WhenToBird

Cygnus buccinator · Anatidae

When Do Trumpeter Swans Arrive in Missouri?

Adult Trumpeter Swan
Photo: brentnmoran, CC BY-SA 4.0 via iNaturalist

Trumpeter Swans are winter birds in Missouri: the first arrive in early November, they are common by the second week of November, peak in early December (4.4% of checklists), and most are gone by late February.

When to look

First arrivalsNov 1-7early November
Common byNov 8-14the second week of November
PeakDec 1-7early December
Most gone byFeb 22-28late February

Best: early December. First arrivals early November; most are gone by late February. Peak: on about 4.4% of Missouri checklists.

  1. Janpeak season
  2. Febpeak season
  3. Maruncommon
  4. Aprrare
  5. Maynot usually seen
  6. Junnot usually seen
  7. Julnot usually seen
  8. Augnot usually seen
  9. Sepnot usually seen
  10. Octuncommon
  11. Novpeak season
  12. Decpeak season

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

0%2%4%6%Jan 1-7: 3.9% of 12628 checklistsJan 8-14: 3.8% of 9076 checklistsJan 15-21: 3.9% of 8790 checklistsJan 22-31: 4.3% of 11986 checklistsFeb 1-7: 3.2% of 8987 checklistsFeb 8-14: 2.4% of 10394 checklistsFeb 15-21: 1.9% of 15472 checklistsFeb 22-28: 2.5% of 9917 checklistsMar 1-7: 1.3% of 9877 checklistsMar 8-14: 0.9% of 9570 checklistsMar 15-21: 1.0% of 10274 checklistsMar 22-31: 0.5% of 16156 checklistsApr 1-7: 0.5% of 12774 checklistsApr 8-14: 0.3% of 14048 checklistsApr 15-21: 0.1% of 14894 checklistsApr 22-30: 0.1% of 23288 checklistsMay 1-7: 0.1% of 22645 checklistsMay 8-14: 0.1% of 21384 checklistsMay 15-21: 0.1% of 13989 checklistsMay 22-31: 0.1% of 15784 checklistsJun 1-7: 0.1% of 9691 checklistsJun 8-14: 0.1% of 9036 checklistsJun 15-21: 0% of 7907 checklistsJun 22-30: 0.1% of 9831 checklistsJul 1-7: 0% of 8008 checklistsJul 8-14: 0% of 7202 checklistsJul 15-21: 0% of 7151 checklistsJul 22-31: 0.1% of 9833 checklistsAug 1-7: 0.1% of 7639 checklistsAug 8-14: 0% of 7507 checklistsAug 15-21: 0.1% of 7429 checklistsAug 22-31: 0.1% of 11182 checklistsSep 1-7: 0% of 9471 checklistsSep 8-14: 0.1% of 8501 checklistsSep 15-21: 0.1% of 8169 checklistsSep 22-30: 0.1% of 11572 checklistsOct 1-7: 0.1% of 9028 checklistsOct 8-14: 0.1% of 9413 checklistsOct 15-21: 0.1% of 8656 checklistsOct 22-31: 0.6% of 11625 checklistsNov 1-7: 1.4% of 8627 checklistsNov 8-14: 2.0% of 8284 checklistsNov 15-21: 3.4% of 8075 checklistsNov 22-30: 4.2% of 10430 checklistsDec 1-7: 4.8% of 7870 checklistsDec 8-14: 4.3% of 7567 checklistsDec 15-21: 3.4% of 9696 checklistsDec 22-31: 4.0% 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. Holt CountyBest early December · 41 checklists that week, 1,665 in all60%
  2. Lewis CountyBest late December · 32 checklists that week, 1,047 in all55%
  3. Chariton CountyBest the second week of December · 18 checklists that week, 586 in all50%
  4. St. Charles CountyBest early December · 602 checklists that week, 33,508 in all41%
  5. Putnam CountyBest mid February · 11 checklists that week, 790 in all36%
  6. Audrain CountyBest early January · 11 checklists that week, 331 in all30%

Best spots

Share of checklists at the peak
  1. Alton SloughSt. Charles County, best the second week of December · 192 checklists that week, 7,626 in all87%
  2. Muskrat LakeBuchanan County, best late February · 22 checklists that week, 1,018 in all69%
  3. Ellis IslandSt. Charles County, best late January · 33 checklists that week, 791 in all58%
  4. Eagle Bluffs Conservation AreaBoone County, best mid January · 36 checklists that week, 1,684 in all32%
  5. Columbia Bottom Conservation AreaSt. Louis County, best late December · 30 checklists that week, 1,227 in all32%

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

Best time of day

In Missouri, the Trumpeter Swan is most often listed on checklists started between 1 and 3 pm (1.8% of those checklists).

0%0.5%1%1.5%2%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: 0.6% of 27231 checklists7 am: 0.8% of 64162 checklists8 am: 0.9% of 67854 checklists9 am: 1.4% of 56515 checklists10 am: 1.5% of 47496 checklists11 am: 1.6% of 38845 checklists12 pm: 1.6% of 33383 checklists1 pm: 1.8% of 32503 checklists2 pm: 1.8% of 32615 checklists3 pm: 1.6% of 32514 checklists4 pm: 1.1% of 30274 checklists5 pm: 0.4% of 23446 checklists6 pm: 0.1% 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
January3.9%3.8%3.9%4.3%
February3.2%2.4%1.9%2.5%
March1.3%0.9%1.0%0.5%
April0.5%0.3%0.1%0.1%
May0.1%0.1%0.1%0.1%
June0.1%0.1%0%0.1%
July0%0%0%0.1%
August0.1%0%0.1%0.1%
September0%0.1%0.1%0.1%
October0.1%0.1%0.1%0.6%
November1.4%2.0%3.4%4.2%
December4.8%4.3%3.4%4.0%

Neighboring states

  • Arkansas: arrives mid November, 2 weeks later than Missouri
  • Iowa: arrives late September, 5 weeks earlier than Missouri
  • Kansas: arrives the second week of December, 5 weeks later than Missouri
  • Illinois: arrives late October, 1 week earlier than Missouri

Common questions

When do Trumpeter Swans arrive in Missouri?
Trumpeter Swans are winter birds in Missouri: the first arrive in early November, they are common by the second week of November, peak in early December (4.4% of checklists), and most are gone by late February.
When do Trumpeter Swans leave Missouri?
Most Trumpeter Swans have left Missouri by late February, when reports fall below half their usual rate. Stragglers are still reported until the second week of March.
When is the best time to see a Trumpeter Swan in Missouri?
The Trumpeter Swan is reported most often in early December, on about 4.4% of Missouri checklists.
Where in Missouri are Trumpeter Swans seen most often?
By county, Holt County, Lewis County, and Chariton County have the highest peak reporting rates for the Trumpeter Swan (counties with at least 200 checklists).