WhenToBird

Calidris minutilla · Scolopacidae

When Do Least Sandpipers Arrive in Iowa?

Adult Least Sandpiper
Photo: Alessandro Franchini, CC BY 4.0 via iNaturalist

Least Sandpipers reach Iowa in early July, are common by the second week of July, peak in the second week of August (10% of checklists), and most are gone by late September.

When to look

First arrivalsJul 1-7early July
Common byJul 8-14the second week of July
PeakAug 8-14the second week of August
Most gone bySep 22-30late September

Best: the second week of August. First arrivals early July; most are gone by late September. Peak: on about 10% of Iowa checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Apruncommon
  5. Maycommon
  6. Junrare
  7. Julcommon
  8. Augpeak season
  9. Sepcommon
  10. Octuncommon
  11. Novrare
  12. Decnot usually seen

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

0%5%10%15%Jan 1-7: 0% of 5551 checklistsJan 8-14: 0% of 3498 checklistsJan 15-21: 0% of 3803 checklistsJan 22-31: 0% of 4807 checklistsFeb 1-7: 0% of 3613 checklistsFeb 8-14: 0% of 4173 checklistsFeb 15-21: 0% of 5796 checklistsFeb 22-28: 0% of 4394 checklistsMar 1-7: 0% of 5295 checklistsMar 8-14: 0.1% of 5679 checklistsMar 15-21: 0.1% of 5418 checklistsMar 22-31: 0.1% of 8613 checklistsApr 1-7: 0.4% of 6970 checklistsApr 8-14: 1.0% of 7511 checklistsApr 15-21: 1.5% of 8321 checklistsApr 22-30: 3.5% of 11976 checklistsMay 1-7: 5.6% of 11725 checklistsMay 8-14: 6.4% of 12626 checklistsMay 15-21: 6.3% of 9372 checklistsMay 22-31: 1.8% of 10330 checklistsJun 1-7: 0.3% of 5472 checklistsJun 8-14: 0% of 4568 checklistsJun 15-21: 0.1% of 3870 checklistsJun 22-30: 0.1% of 4780 checklistsJul 1-7: 1.5% of 4201 checklistsJul 8-14: 3.7% of 3605 checklistsJul 15-21: 4.4% of 3621 checklistsJul 22-31: 6.1% of 5093 checklistsAug 1-7: 8.4% of 3931 checklistsAug 8-14: 12% of 3488 checklistsAug 15-21: 11% of 3802 checklistsAug 22-31: 8.2% of 6293 checklistsSep 1-7: 6.3% of 5328 checklistsSep 8-14: 4.3% of 4622 checklistsSep 15-21: 3.8% of 4367 checklistsSep 22-30: 2.6% of 6086 checklistsOct 1-7: 1.6% of 4708 checklistsOct 8-14: 1.4% of 4791 checklistsOct 15-21: 1.0% of 4429 checklistsOct 22-31: 0.9% of 5633 checklistsNov 1-7: 0.9% of 4090 checklistsNov 8-14: 0.4% of 3416 checklistsNov 15-21: 0.3% of 3398 checklistsNov 22-30: 0.1% of 4679 checklistsDec 1-7: 0% of 3442 checklistsDec 8-14: 0.1% of 3322 checklistsDec 15-21: 0% of 4619 checklistsDec 22-31: 0% 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. Calhoun CountyBest the second week of August · 11 checklists that week, 446 in all61%
  2. Mahaska CountyBest the second week of July · 18 checklists that week, 912 in all32%
  3. Marion CountyBest the second week of August · 35 checklists that week, 3,389 in all32%
  4. Montgomery CountyBest the second week of September · 22 checklists that week, 213 in all29%
  5. Kossuth CountyBest early August · 27 checklists that week, 628 in all29%
  6. Hardin CountyBest the second week of May · 40 checklists that week, 1,479 in all28%

Best spots

Share of checklists at the peak
  1. Wisniewski PondJohnson County, best the second week of August · 28 checklists that week, 475 in all80%
  2. Jester ParkPolk County, best the second week of August · 20 checklists that week, 735 in all70%
  3. Cedar River Crossing AdditionJohnson County, best the second week of May · 29 checklists that week, 564 in all68%
  4. Sand Lake City ParkJohnson County, best the second week of May · 233 checklists that week, 2,979 in all68%
  5. Coralville Recreation Area (west)Johnson County, best early August · 22 checklists that week, 329 in all66%
  6. Jester Park (northwest)Polk County, best early August · 20 checklists that week, 254 in all59%

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

Best time of day

In Iowa, the Least Sandpiper is most often listed on checklists started between 6 and 8 pm (3.8% of those checklists).

0%2%4%6%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: 4.0% of 11313 checklists7 am: 2.6% of 25717 checklists8 am: 2.4% of 29755 checklists9 am: 2.1% of 28897 checklists10 am: 2.1% of 26343 checklists11 am: 2.2% of 21210 checklists12 pm: 1.9% of 17662 checklists1 pm: 2.0% of 16595 checklists2 pm: 1.7% of 16405 checklists3 pm: 2.2% of 17030 checklists4 pm: 2.2% of 17378 checklists5 pm: 3.3% of 14251 checklists6 pm: 4.2% of 10349 checklists7 pm: 3.2% 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
January0%0%0%0%
February0%0%0%0%
March0%0.1%0.1%0.1%
April0.4%1.0%1.5%3.5%
May5.6%6.4%6.3%1.8%
June0.3%0%0.1%0.1%
July1.5%3.7%4.4%6.1%
August8.4%12%11%8.2%
September6.3%4.3%3.8%2.6%
October1.6%1.4%1.0%0.9%
November0.9%0.4%0.3%0.1%
December0%0.1%0%0%

Neighboring states

  • Missouri: arrives early July, in the same week than Iowa
  • Wisconsin: arrives early July, in the same week than Iowa
  • Minnesota: arrives early July, in the same week than Iowa
  • Illinois: arrives late June, 1 week earlier than Iowa

Common questions

When do Least Sandpipers arrive in Iowa?
Least Sandpipers reach Iowa in early July, are common by the second week of July, peak in the second week of August (10% of checklists), and most are gone by late September.
When do Least Sandpipers leave Iowa?
Most Least Sandpipers have left Iowa by late September, when reports fall below half their usual rate. Stragglers are still reported until mid October.
When is the best time to see a Least Sandpiper in Iowa?
The Least Sandpiper is reported most often in the second week of August, on about 10% of Iowa checklists.
Where in Iowa are Least Sandpipers seen most often?
By county, Calhoun County, Mahaska County, and Marion County have the highest peak reporting rates for the Least Sandpiper (counties with at least 200 checklists).