WhenToBird

Sturnus vulgaris · Sturnidae

When Do European Starlings Arrive in Iowa?

Adult female European Starling
Photo: egorbirder, CC BY 4.0 via iNaturalist

The European Starling is in Iowa all year. It turns up on about 32% of checklists at its peak (early May) and on 16% in its quietest week (early August).

When to look

PresentAll year
Peak weekMay 1-7early May
Quietest weekAug 1-7early August

Best: early May. Here all year. Peak: on about 32% of Iowa checklists.

  1. Janpeak season
  2. Febpeak season
  3. Marpeak season
  4. Aprpeak season
  5. Maypeak season
  6. Junpeak season
  7. Julpeak season
  8. Augcommon
  9. Sepcommon
  10. Octpeak season
  11. Novcommon
  12. Deccommon

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

0%10%20%30%40%Jan 1-7: 23% of 5551 checklistsJan 8-14: 25% of 3498 checklistsJan 15-21: 25% of 3803 checklistsJan 22-31: 27% of 4807 checklistsFeb 1-7: 25% of 3613 checklistsFeb 8-14: 27% of 4173 checklistsFeb 15-21: 29% of 5796 checklistsFeb 22-28: 30% of 4394 checklistsMar 1-7: 30% of 5295 checklistsMar 8-14: 30% of 5679 checklistsMar 15-21: 29% of 5418 checklistsMar 22-31: 29% of 8613 checklistsApr 1-7: 28% of 6970 checklistsApr 8-14: 31% of 7511 checklistsApr 15-21: 32% of 8321 checklistsApr 22-30: 33% of 11976 checklistsMay 1-7: 31% of 11725 checklistsMay 8-14: 33% of 12626 checklistsMay 15-21: 32% of 9372 checklistsMay 22-31: 33% of 10330 checklistsJun 1-7: 31% of 5472 checklistsJun 8-14: 27% of 4568 checklistsJun 15-21: 27% of 3870 checklistsJun 22-30: 26% of 4780 checklistsJul 1-7: 25% of 4201 checklistsJul 8-14: 22% of 3605 checklistsJul 15-21: 17% of 3621 checklistsJul 22-31: 17% of 5093 checklistsAug 1-7: 16% of 3931 checklistsAug 8-14: 16% of 3488 checklistsAug 15-21: 17% of 3802 checklistsAug 22-31: 18% of 6293 checklistsSep 1-7: 18% of 5328 checklistsSep 8-14: 21% of 4622 checklistsSep 15-21: 22% of 4367 checklistsSep 22-30: 24% of 6086 checklistsOct 1-7: 26% of 4708 checklistsOct 8-14: 26% of 4791 checklistsOct 15-21: 28% of 4429 checklistsOct 22-31: 26% of 5633 checklistsNov 1-7: 25% of 4090 checklistsNov 8-14: 21% of 3416 checklistsNov 15-21: 21% of 3398 checklistsNov 22-30: 22% of 4679 checklistsDec 1-7: 21% of 3442 checklistsDec 8-14: 23% of 3322 checklistsDec 15-21: 24% of 4619 checklistsDec 22-31: 24% 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. Pocahontas CountyBest early May · 31 checklists that week, 735 in all66%
  2. Clarke CountyBest the second week of March · 13 checklists that week, 459 in all63%
  3. Des Moines CountyBest mid June · 20 checklists that week, 2,251 in all62%
  4. Wapello CountyBest late May · 63 checklists that week, 654 in all61%
  5. Calhoun CountyBest late June · 20 checklists that week, 446 in all60%
  6. Cherokee CountyBest early May · 12 checklists that week, 360 in all59%

Best spots

Share of checklists at the peak
  1. Waterworks ParkPolk County, best late May · 21 checklists that week, 1,058 in all94%
  2. Laverne Lake (southwest)Story County, best the second week of April · 26 checklists that week, 329 in all89%
  3. Walnut Woods State ParkPolk County, best late May · 21 checklists that week, 643 in all81%
  4. Saylorville Recreation Area (southeast)Polk County, best late June · 22 checklists that week, 867 in all80%
  5. Riverview Recreation AreaBlack Hawk County, best late September · 21 checklists that week, 339 in all80%
  6. Credit Isand ParkScott County, best early June · 21 checklists that week, 777 in all77%

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

Best time of day

In Iowa, the European Starling is most often listed on checklists started between 6 and 8 am (39% of those checklists).

0%10%20%30%40%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: 39% of 11313 checklists7 am: 39% of 25717 checklists8 am: 35% of 29755 checklists9 am: 27% of 28897 checklists10 am: 22% of 26343 checklists11 am: 20% of 21210 checklists12 pm: 20% of 17662 checklists1 pm: 19% of 16595 checklists2 pm: 20% of 16405 checklists3 pm: 23% of 17030 checklists4 pm: 25% of 17378 checklists5 pm: 28% of 14251 checklists6 pm: 28% of 10349 checklists7 pm: 23% 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
January23%25%25%27%
February25%27%29%30%
March30%30%29%29%
April28%31%32%33%
May31%33%32%33%
June31%27%27%26%
July25%22%17%17%
August16%16%17%18%
September18%21%22%24%
October26%26%28%26%
November25%21%21%22%
December21%23%24%24%

Neighboring states

  • Missouri: year-round, peaks mid February
  • Wisconsin: year-round, peaks late April
  • Minnesota: year-round, peaks the second week of June
  • Illinois: year-round, peaks the second week of April

Common questions

When do European Starlings arrive in Iowa?
The European Starling is in Iowa all year. It turns up on about 32% of checklists at its peak (early May) and on 16% in its quietest week (early August).
When do European Starlings leave Iowa?
The European Starling does not leave Iowa: it is reported all year, from 16% of checklists in early August to 32% in early May.
When is the best time to see a European Starling in Iowa?
The European Starling is reported most often in early May, on about 32% of Iowa checklists.
Where in Iowa are European Starlings seen most often?
By county, Pocahontas County, Clarke County, and Des Moines County have the highest peak reporting rates for the European Starling (counties with at least 200 checklists).