WhenToBird

Toxostoma rufum · Mimidae

When Do Brown Thrashers Arrive in Missouri?

Adult Brown Thrasher
Photo: northerly, CC BY 4.0 via iNaturalist

Brown Thrashers reach Missouri in the second week of March, are common by mid March, peak in late April (19% of checklists), and most are gone by early October.

When to look

First arrivalsMar 8-14the second week of March
Common byMar 15-21mid March
PeakApr 22-30late April
Most gone byOct 1-7early October

Best: late April. First arrivals the second week of March; most are gone by early October. Peak: on about 19% of Missouri checklists.

  1. Jannot usually seen
  2. Febrare
  3. Marcommon
  4. Aprpeak season
  5. Maypeak season
  6. Junpeak season
  7. Julcommon
  8. Auguncommon
  9. Sepcommon
  10. Octuncommon
  11. Novrare
  12. Decrare

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

0%5%10%15%20%Jan 1-7: 0.6% of 12628 checklistsJan 8-14: 0.8% of 9076 checklistsJan 15-21: 0.8% of 8790 checklistsJan 22-31: 0.7% of 11986 checklistsFeb 1-7: 0.7% of 8987 checklistsFeb 8-14: 1.2% of 10394 checklistsFeb 15-21: 1.2% of 15472 checklistsFeb 22-28: 0.7% of 9917 checklistsMar 1-7: 0.9% of 9877 checklistsMar 8-14: 1.4% of 9570 checklistsMar 15-21: 3.4% of 10274 checklistsMar 22-31: 11% of 16156 checklistsApr 1-7: 17% of 12774 checklistsApr 8-14: 19% of 14048 checklistsApr 15-21: 19% of 14894 checklistsApr 22-30: 20% of 23288 checklistsMay 1-7: 19% of 22645 checklistsMay 8-14: 18% of 21384 checklistsMay 15-21: 18% of 13989 checklistsMay 22-31: 16% of 15784 checklistsJun 1-7: 16% of 9691 checklistsJun 8-14: 16% of 9036 checklistsJun 15-21: 16% of 7907 checklistsJun 22-30: 15% of 9831 checklistsJul 1-7: 14% of 8008 checklistsJul 8-14: 11% of 7202 checklistsJul 15-21: 9.9% of 7151 checklistsJul 22-31: 7.7% of 9833 checklistsAug 1-7: 6.1% of 7639 checklistsAug 8-14: 5.0% of 7507 checklistsAug 15-21: 4.6% of 7429 checklistsAug 22-31: 5.2% of 11182 checklistsSep 1-7: 7.1% of 9471 checklistsSep 8-14: 9.8% of 8501 checklistsSep 15-21: 11% of 8169 checklistsSep 22-30: 11% of 11572 checklistsOct 1-7: 6.6% of 9028 checklistsOct 8-14: 3.6% of 9413 checklistsOct 15-21: 2.6% of 8656 checklistsOct 22-31: 1.5% of 11625 checklistsNov 1-7: 1.0% of 8627 checklistsNov 8-14: 0.7% of 8284 checklistsNov 15-21: 1.0% of 8075 checklistsNov 22-30: 0.7% of 10430 checklistsDec 1-7: 0.4% of 7870 checklistsDec 8-14: 0.7% of 7567 checklistsDec 15-21: 1.0% of 9696 checklistsDec 22-31: 0.7% 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. Daviess CountyBest mid April · 31 checklists that week, 1,354 in all67%
  2. Lewis CountyBest the second week of April · 22 checklists that week, 1,047 in all58%
  3. Gentry CountyBest the second week of May · 11 checklists that week, 229 in all49%
  4. Worth CountyBest early July · 10 checklists that week, 235 in all48%
  5. Nodaway CountyBest mid April · 15 checklists that week, 834 in all48%
  6. Barton CountyBest mid May · 32 checklists that week, 1,629 in all47%

Best spots

Share of checklists at the peak
  1. August A Busch Lake Number 9St. Charles County, best the second week of June · 53 checklists that week, 1,115 in all87%
  2. Corby GroveBuchanan County, best late April · 24 checklists that week, 210 in all71%
  3. Hi Lonesome Prairie Conservation AreaBenton County, best late May · 25 checklists that week, 578 in all69%
  4. Tower Grove ParkSt. Louis City, best the second week of April · 187 checklists that week, 6,087 in all68%
  5. Taberville Prairie Natural AreaSt. Clair County, best mid April · 29 checklists that week, 269 in all66%

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

Best time of day

In Missouri, the Brown Thrasher is most often listed on checklists started between 6 and 8 am (14% of those checklists).

0%5%10%15%20%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: 17% of 27231 checklists7 am: 12% of 64162 checklists8 am: 11% of 67854 checklists9 am: 8.6% of 56515 checklists10 am: 7.0% of 47496 checklists11 am: 6.3% of 38845 checklists12 pm: 5.7% of 33383 checklists1 pm: 5.7% of 32503 checklists2 pm: 6.1% of 32615 checklists3 pm: 5.3% of 32514 checklists4 pm: 6.2% of 30274 checklists5 pm: 9.4% of 23446 checklists6 pm: 9.5% 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
January0.6%0.8%0.8%0.7%
February0.7%1.2%1.2%0.7%
March0.9%1.4%3.4%11%
April17%19%19%20%
May19%18%18%16%
June16%16%16%15%
July14%11%9.9%7.7%
August6.1%5.0%4.6%5.2%
September7.1%9.8%11%11%
October6.6%3.6%2.6%1.5%
November1.0%0.7%1.0%0.7%
December0.4%0.7%1.0%0.7%

Neighboring states

  • Arkansas: arrives mid March, 1 week later than Missouri
  • Iowa: arrives early April, 3 weeks later than Missouri
  • Kansas: arrives mid March, 1 week later than Missouri
  • Illinois: arrives mid March, 1 week later than Missouri

Common questions

When do Brown Thrashers arrive in Missouri?
Brown Thrashers reach Missouri in the second week of March, are common by mid March, peak in late April (19% of checklists), and most are gone by early October.
When do Brown Thrashers leave Missouri?
Most Brown Thrashers have left Missouri by early October, when reports fall below half their usual rate. Stragglers are still reported until late October.
When is the best time to see a Brown Thrasher in Missouri?
The Brown Thrasher is reported most often in late April, on about 19% of Missouri checklists.
Where in Missouri are Brown Thrashers seen most often?
By county, Daviess County, Lewis County, and Gentry County have the highest peak reporting rates for the Brown Thrasher (counties with at least 200 checklists).