WhenToBird

Passerella iliaca · Passerellidae

When Do Fox Sparrows Arrive in Missouri?

Adult Fox Sparrow
Photo: Kevin Krebs, CC BY 4.0 via iNaturalist

Fox Sparrows are winter birds in Missouri: the first arrive in mid October, they are common by late October, peak in the second week of March (6.4% of checklists), and most are gone by early April.

When to look

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

Best: the second week of March. First arrivals mid October; most are gone by early April. Peak: on about 6.4% of Missouri checklists.

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

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

0%2%4%6%8%Jan 1-7: 5.9% of 12628 checklistsJan 8-14: 6.6% of 9076 checklistsJan 15-21: 6.4% of 8790 checklistsJan 22-31: 5.0% of 11986 checklistsFeb 1-7: 5.8% of 8987 checklistsFeb 8-14: 6.7% of 10394 checklistsFeb 15-21: 5.4% of 15472 checklistsFeb 22-28: 5.1% of 9917 checklistsMar 1-7: 6.0% of 9877 checklistsMar 8-14: 6.6% of 9570 checklistsMar 15-21: 6.7% of 10274 checklistsMar 22-31: 6.1% of 16156 checklistsApr 1-7: 3.2% of 12774 checklistsApr 8-14: 1.0% of 14048 checklistsApr 15-21: 0.2% of 14894 checklistsApr 22-30: 0.1% of 23288 checklistsMay 1-7: 0% of 22645 checklistsMay 8-14: 0.1% of 21384 checklistsMay 15-21: 0% of 13989 checklistsMay 22-31: 0% of 15784 checklistsJun 1-7: 0% of 9691 checklistsJun 8-14: 0% of 9036 checklistsJun 15-21: 0% of 7907 checklistsJun 22-30: 0% of 9831 checklistsJul 1-7: 0% of 8008 checklistsJul 8-14: 0% of 7202 checklistsJul 15-21: 0% of 7151 checklistsJul 22-31: 0% of 9833 checklistsAug 1-7: 0% of 7639 checklistsAug 8-14: 0% of 7507 checklistsAug 15-21: 0% of 7429 checklistsAug 22-31: 0% of 11182 checklistsSep 1-7: 0% of 9471 checklistsSep 8-14: 0% of 8501 checklistsSep 15-21: 0% of 8169 checklistsSep 22-30: 0.1% of 11572 checklistsOct 1-7: 0.1% of 9028 checklistsOct 8-14: 0.6% of 9413 checklistsOct 15-21: 1.9% of 8656 checklistsOct 22-31: 4.4% of 11625 checklistsNov 1-7: 5.8% of 8627 checklistsNov 8-14: 5.8% of 8284 checklistsNov 15-21: 6.0% of 8075 checklistsNov 22-30: 5.4% of 10430 checklistsDec 1-7: 6.0% of 7870 checklistsDec 8-14: 4.9% of 7567 checklistsDec 15-21: 5.9% of 9696 checklistsDec 22-31: 5.2% 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.

Embed this map on your site

Where in Missouri

Best counties

Share of checklists at the peak
  1. St. Clair CountyBest early November · 25 checklists that week, 1,484 in all49%
  2. Iron CountyBest mid February · 99 checklists that week, 4,515 in all46%
  3. Ste. Genevieve CountyBest the second week of January · 29 checklists that week, 1,675 in all41%
  4. Knox CountyBest early April · 13 checklists that week, 215 in all38%
  5. Reynolds CountyBest mid January · 12 checklists that week, 1,218 in all38%
  6. Ralls CountyBest the second week of March · 13 checklists that week, 1,204 in all38%

Best spots

Share of checklists at the peak
  1. Tower Grove ParkSt. Louis City, best mid March · 74 checklists that week, 6,087 in all54%
  2. Columbia Bottom Conservation AreaSt. Louis County, best mid November · 32 checklists that week, 1,227 in all49%
  3. Usace-Cora IslandSt. Charles County, best early January · 30 checklists that week, 282 in all48%
  4. August A Busch Refuge LakeSt. Charles County, best mid January · 43 checklists that week, 1,945 in all43%
  5. Marais Temps Clair Conservation AreaSt. Charles County, best early March · 28 checklists that week, 680 in all38%

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

Best time of day

In Missouri, the Fox Sparrow is most often listed on checklists started between 8 and 10 am (3.1% of those checklists).

0%1%2%3%4%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: 1.8% of 27231 checklists7 am: 2.7% of 64162 checklists8 am: 3.0% of 67854 checklists9 am: 3.3% of 56515 checklists10 am: 2.8% of 47496 checklists11 am: 2.6% of 38845 checklists12 pm: 2.8% of 33383 checklists1 pm: 2.9% of 32503 checklists2 pm: 2.8% of 32615 checklists3 pm: 2.6% of 32514 checklists4 pm: 2.5% of 30274 checklists5 pm: 1.6% of 23446 checklists6 pm: 0.5% 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
January5.9%6.6%6.4%5.0%
February5.8%6.7%5.4%5.1%
March6.0%6.6%6.7%6.1%
April3.2%1.0%0.2%0.1%
May0%0.1%0%0%
June0%0%0%0%
July0%0%0%0%
August0%0%0%0%
September0%0%0%0.1%
October0.1%0.6%1.9%4.4%
November5.8%5.8%6.0%5.4%
December6.0%4.9%5.9%5.2%

Neighboring states

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

Common questions

When do Fox Sparrows arrive in Missouri?
Fox Sparrows are winter birds in Missouri: the first arrive in mid October, they are common by late October, peak in the second week of March (6.4% of checklists), and most are gone by early April.
When do Fox Sparrows leave Missouri?
Most Fox Sparrows have left Missouri by early April, when reports fall below half their usual rate. Stragglers are still reported until the second week of April.
When is the best time to see a Fox Sparrow in Missouri?
The Fox Sparrow is reported most often in the second week of March, on about 6.4% of Missouri checklists.
Where in Missouri are Fox Sparrows seen most often?
By county, St. Clair County, Iron County, and Ste. Genevieve County have the highest peak reporting rates for the Fox Sparrow (counties with at least 200 checklists).