WhenToBird

Passer montanus · Passeridae

When Do Eurasian Tree Sparrows Arrive in Missouri?

The Eurasian Tree Sparrow is in Missouri all year. It turns up on about 10% of checklists at its peak (the second week of February) and on 5.8% in its quietest week (the second week of September).

When to look

PresentAll year
Peak weekFeb 8-14the second week of February
Quietest weekSep 8-14the second week of September

Best: the second week of February. Here all year. Peak: on about 10% of Missouri checklists.

  1. Janpeak season
  2. Febpeak season
  3. Marpeak season
  4. Aprcommon
  5. Maypeak season
  6. Junpeak season
  7. Julpeak season
  8. Augpeak season
  9. Sepcommon
  10. Octpeak season
  11. Novpeak season
  12. Decpeak season

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

0%5%10%15%Jan 1-7: 8.9% of 12628 checklistsJan 8-14: 9.7% of 9076 checklistsJan 15-21: 9.6% of 8790 checklistsJan 22-31: 9.0% of 11986 checklistsFeb 1-7: 10% of 8987 checklistsFeb 8-14: 9.9% of 10394 checklistsFeb 15-21: 11% of 15472 checklistsFeb 22-28: 9.0% of 9917 checklistsMar 1-7: 8.4% of 9877 checklistsMar 8-14: 8.2% of 9570 checklistsMar 15-21: 7.8% of 10274 checklistsMar 22-31: 7.4% of 16156 checklistsApr 1-7: 7.3% of 12774 checklistsApr 8-14: 6.8% of 14048 checklistsApr 15-21: 6.7% of 14894 checklistsApr 22-30: 7.1% of 23288 checklistsMay 1-7: 7.8% of 22645 checklistsMay 8-14: 7.6% of 21384 checklistsMay 15-21: 7.9% of 13989 checklistsMay 22-31: 8.1% of 15784 checklistsJun 1-7: 8.5% of 9691 checklistsJun 8-14: 8.6% of 9036 checklistsJun 15-21: 9.0% of 7907 checklistsJun 22-30: 9.6% of 9831 checklistsJul 1-7: 9.7% of 8008 checklistsJul 8-14: 9.8% of 7202 checklistsJul 15-21: 9.4% of 7151 checklistsJul 22-31: 9.6% of 9833 checklistsAug 1-7: 8.8% of 7639 checklistsAug 8-14: 8.5% of 7507 checklistsAug 15-21: 7.6% of 7429 checklistsAug 22-31: 6.7% of 11182 checklistsSep 1-7: 5.6% of 9471 checklistsSep 8-14: 6.1% of 8501 checklistsSep 15-21: 5.7% of 8169 checklistsSep 22-30: 6.5% of 11572 checklistsOct 1-7: 7.6% of 9028 checklistsOct 8-14: 8.3% of 9413 checklistsOct 15-21: 8.1% of 8656 checklistsOct 22-31: 9.1% of 11625 checklistsNov 1-7: 9.0% of 8627 checklistsNov 8-14: 8.9% of 8284 checklistsNov 15-21: 9.1% of 8075 checklistsNov 22-30: 9.5% of 10430 checklistsDec 1-7: 11% of 7870 checklistsDec 8-14: 9.6% of 7567 checklistsDec 15-21: 7.7% of 9696 checklistsDec 22-31: 8.9% 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. St. Louis CountyBest early July · 1462 checklists that week, 97,156 in all43%
  2. Lewis CountyBest late December · 32 checklists that week, 1,047 in all24%
  3. St. Charles CountyBest the second week of February · 665 checklists that week, 33,508 in all23%
  4. Pike CountyBest late April · 72 checklists that week, 1,685 in all19%
  5. Knox CountyBest late March · 19 checklists that week, 215 in all18%
  6. Lincoln CountyBest mid July · 37 checklists that week, 4,899 in all17%

Best spots

Share of checklists at the peak
  1. Blackburn ParkSt. Louis County, best early May · 28 checklists that week, 334 in all86%
  2. Kimmswick Open SpaceJefferson County, best late October · 21 checklists that week, 361 in all63%
  3. Jefferson Barracks County ParkSt. Louis County, best late October · 23 checklists that week, 1,157 in all54%
  4. Mississippi Greenway - River des Peres to Jefferson BarracksSt. Louis County, best late July · 23 checklists that week, 419 in all44%

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

Best time of day

In Missouri, the Eurasian Tree Sparrow is most often listed on checklists started between 7 and 9 am (12% of those checklists).

0%5%10%15%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: 11% of 27231 checklists7 am: 12% of 64162 checklists8 am: 12% of 67854 checklists9 am: 9.7% of 56515 checklists10 am: 7.3% of 47496 checklists11 am: 6.5% of 38845 checklists12 pm: 6.0% of 33383 checklists1 pm: 5.8% of 32503 checklists2 pm: 6.0% of 32615 checklists3 pm: 5.7% of 32514 checklists4 pm: 5.5% of 30274 checklists5 pm: 6.9% of 23446 checklists6 pm: 6.6% 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
January8.9%9.7%9.6%9.0%
February10%9.9%11%9.0%
March8.4%8.2%7.8%7.4%
April7.3%6.8%6.7%7.1%
May7.8%7.6%7.9%8.1%
June8.5%8.6%9.0%9.6%
July9.7%9.8%9.4%9.6%
August8.8%8.5%7.6%6.7%
September5.6%6.1%5.7%6.5%
October7.6%8.3%8.1%9.1%
November9.0%8.9%9.1%9.5%
December11%9.6%7.7%8.9%

Neighboring states

  • Iowa: all year, most in winter, peaks mid February
  • Illinois: winter visitor, peaks late January

Common questions

When do Eurasian Tree Sparrows arrive in Missouri?
The Eurasian Tree Sparrow is in Missouri all year. It turns up on about 10% of checklists at its peak (the second week of February) and on 5.8% in its quietest week (the second week of September).
When do Eurasian Tree Sparrows leave Missouri?
The Eurasian Tree Sparrow does not leave Missouri: it is reported all year, from 5.8% of checklists in the second week of September to 10% in the second week of February.
When is the best time to see a Eurasian Tree Sparrow in Missouri?
The Eurasian Tree Sparrow is reported most often in the second week of February, on about 10% of Missouri checklists.
Where in Missouri are Eurasian Tree Sparrows seen most often?
By county, St. Louis County, Lewis County, and St. Charles County have the highest peak reporting rates for the Eurasian Tree Sparrow (counties with at least 200 checklists).