WhenToBird

Zonotrichia albicollis · Passerellidae

When Do White-throated Sparrows Arrive in Iowa?

Adult White-throated Sparrow
Photo: northerly, CC BY 4.0 via iNaturalist

White-throated Sparrows are winter birds in Iowa: the first arrive in the second week of September, they are common by mid September, peak in mid October (44% of checklists), and most are gone by mid May.

When to look

First arrivalsSep 8-14the second week of September
Common bySep 15-21mid September
PeakOct 15-21mid October
Most gone byMay 15-21mid May

Best: mid October. First arrivals the second week of September; most are gone by mid May. Peak: on about 44% of Iowa checklists.

  1. Januncommon
  2. Febuncommon
  3. Marrare
  4. Aprcommon
  5. Maycommon
  6. Junnot usually seen
  7. Julnot usually seen
  8. Augnot usually seen
  9. Sepcommon
  10. Octpeak season
  11. Novcommon
  12. Decuncommon

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

0%20%40%60%Jan 1-7: 9.1% of 5551 checklistsJan 8-14: 9.1% of 3498 checklistsJan 15-21: 8.4% of 3803 checklistsJan 22-31: 9.1% of 4807 checklistsFeb 1-7: 8.7% of 3613 checklistsFeb 8-14: 8.6% of 4173 checklistsFeb 15-21: 7.6% of 5796 checklistsFeb 22-28: 6.4% of 4394 checklistsMar 1-7: 4.7% of 5295 checklistsMar 8-14: 5.8% of 5679 checklistsMar 15-21: 5.1% of 5418 checklistsMar 22-31: 5.9% of 8613 checklistsApr 1-7: 7.5% of 6970 checklistsApr 8-14: 11% of 7511 checklistsApr 15-21: 20% of 8321 checklistsApr 22-30: 34% of 11976 checklistsMay 1-7: 36% of 11725 checklistsMay 8-14: 19% of 12626 checklistsMay 15-21: 3.5% of 9372 checklistsMay 22-31: 0.2% of 10330 checklistsJun 1-7: 0.1% of 5472 checklistsJun 8-14: 0% of 4568 checklistsJun 15-21: 0.1% of 3870 checklistsJun 22-30: 0% of 4780 checklistsJul 1-7: 0.1% of 4201 checklistsJul 8-14: 0% of 3605 checklistsJul 15-21: 0% of 3621 checklistsJul 22-31: 0% of 5093 checklistsAug 1-7: 0% of 3931 checklistsAug 8-14: 0% of 3488 checklistsAug 15-21: 0% of 3802 checklistsAug 22-31: 0% of 6293 checklistsSep 1-7: 0.1% of 5328 checklistsSep 8-14: 0.5% of 4622 checklistsSep 15-21: 4.1% of 4367 checklistsSep 22-30: 20% of 6086 checklistsOct 1-7: 35% of 4708 checklistsOct 8-14: 46% of 4791 checklistsOct 15-21: 46% of 4429 checklistsOct 22-31: 40% of 5633 checklistsNov 1-7: 31% of 4090 checklistsNov 8-14: 21% of 3416 checklistsNov 15-21: 16% of 3398 checklistsNov 22-30: 12% of 4679 checklistsDec 1-7: 10% of 3442 checklistsDec 8-14: 12% of 3322 checklistsDec 15-21: 12% of 4619 checklistsDec 22-31: 11% of 5113 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 Iowa 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 Iowa

Best counties

Share of checklists at the peak
  1. Montgomery CountyBest mid October · 13 checklists that week, 213 in all79%
  2. Mitchell CountyBest the second week of October · 11 checklists that week, 660 in all78%
  3. Poweshiek CountyBest mid October · 29 checklists that week, 1,402 in all66%
  4. Bremer CountyBest the second week of October · 59 checklists that week, 3,421 in all66%
  5. Black Hawk CountyBest the second week of October · 218 checklists that week, 11,016 in all65%
  6. Clarke CountyBest late April · 22 checklists that week, 459 in all65%

Best spots

Share of checklists at the peak
  1. Carr ParkStory County, best mid October · 21 checklists that week, 1,200 in all96%
  2. Cedar River Crossing AdditionJohnson County, best mid October · 34 checklists that week, 564 in all93%
  3. Hartman Reserve Nature CenterBlack Hawk County, best early May · 75 checklists that week, 711 in all83%
  4. Swiss Valley Nature PreserveDubuque County, best early January · 26 checklists that week, 254 in all81%
  5. Laverne Lake (southwest)Story County, best late April · 54 checklists that week, 329 in all79%
  6. Hickory Hill ParkJohnson County, best late April · 171 checklists that week, 2,281 in all79%

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

Best time of day

In Iowa, the White-throated Sparrow is most often listed on checklists started between 6 and 8 am (16% of those checklists).

0%5%10%15%20%12 am: too few checklists (96) to judge1 am: too few checklists (99) to judge2 am: too few checklists (67) to judge3 am: too few checklists (82) to judge4 am: too few checklists (201) to judge5 am: too few checklists (1888) to judge6 am: 15% of 11313 checklists7 am: 17% of 25717 checklists8 am: 15% of 29755 checklists9 am: 14% of 28897 checklists10 am: 12% of 26343 checklists11 am: 11% of 21210 checklists12 pm: 11% of 17662 checklists1 pm: 11% of 16595 checklists2 pm: 10% of 16405 checklists3 pm: 11% of 17030 checklists4 pm: 12% of 17378 checklists5 pm: 12% of 14251 checklists6 pm: 9.5% of 10349 checklists7 pm: 5.4% of 6233 checklists8 pm: too few checklists (2002) to judge9 pm: too few checklists (392) to judge10 pm: too few checklists (186) to judge11 pm: too few checklists (87) 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
January9.1%9.1%8.4%9.1%
February8.7%8.6%7.6%6.4%
March4.7%5.8%5.1%5.9%
April7.5%11%20%34%
May36%19%3.5%0.2%
June0.1%0%0.1%0%
July0.1%0%0%0%
August0%0%0%0%
September0.1%0.5%4.1%20%
October35%46%46%40%
November31%21%16%12%
December10%12%12%11%

Neighboring states

  • Missouri: arrives early October, 3 weeks later than Iowa
  • Wisconsin: arrives late August, 2 weeks earlier than Iowa
  • Minnesota: arrives early April, 21 weeks earlier than Iowa
  • Illinois: arrives the second week of September, in the same week than Iowa

Common questions

When do White-throated Sparrows arrive in Iowa?
White-throated Sparrows are winter birds in Iowa: the first arrive in the second week of September, they are common by mid September, peak in mid October (44% of checklists), and most are gone by mid May.
When do White-throated Sparrows leave Iowa?
Most White-throated Sparrows have left Iowa by mid May, when reports fall below half their usual rate. Stragglers are still reported until late May.
When is the best time to see a White-throated Sparrow in Iowa?
The White-throated Sparrow is reported most often in mid October, on about 44% of Iowa checklists.
Where in Iowa are White-throated Sparrows seen most often?
By county, Montgomery County, Mitchell County, and Poweshiek County have the highest peak reporting rates for the White-throated Sparrow (counties with at least 200 checklists).