WhenToBird

Calidris pusilla · Scolopacidae

When Do Semipalmated Sandpipers Arrive in Maine?

Adult Semipalmated Sandpiper
Photo: Kathy Richardson, CC BY 4.0 via iNaturalist

Semipalmated Sandpipers reach Maine in the second week of July, are common by late July, peak in late August (14% of checklists), and most are gone by late September.

When to look

First arrivalsJul 8-14the second week of July
Common byJul 22-31late July
PeakAug 22-31late August
Most gone bySep 22-30late September

Best: late August. First arrivals the second week of July; most are gone by late September. Peak: on about 14% of Maine checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Aprnot usually seen
  5. Mayrare
  6. Junrare
  7. Julcommon
  8. Augpeak season
  9. Seppeak season
  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 15499 checklistsJan 8-14: 0% of 11141 checklistsJan 15-21: 0% of 10729 checklistsJan 22-31: 0% of 15084 checklistsFeb 1-7: 0% of 9403 checklistsFeb 8-14: 0% of 11268 checklistsFeb 15-21: 0% of 14061 checklistsFeb 22-28: 0% of 9977 checklistsMar 1-7: 0% of 9649 checklistsMar 8-14: 0% of 11781 checklistsMar 15-21: 0% of 11613 checklistsMar 22-31: 0% of 17798 checklistsApr 1-7: 0% of 14638 checklistsApr 8-14: 0% of 16511 checklistsApr 15-21: 0% of 17164 checklistsApr 22-30: 0% of 22602 checklistsMay 1-7: 0.1% of 22556 checklistsMay 8-14: 0.2% of 27842 checklistsMay 15-21: 1.1% of 27748 checklistsMay 22-31: 1.6% of 38715 checklistsJun 1-7: 1.1% of 26916 checklistsJun 8-14: 0.7% of 23737 checklistsJun 15-21: 0.3% of 22733 checklistsJun 22-30: 0.1% of 28248 checklistsJul 1-7: 0.2% of 20290 checklistsJul 8-14: 1.4% of 18534 checklistsJul 15-21: 3.7% of 17319 checklistsJul 22-31: 7.0% of 22815 checklistsAug 1-7: 9.9% of 15004 checklistsAug 8-14: 11% of 14603 checklistsAug 15-21: 14% of 14972 checklistsAug 22-31: 14% of 19813 checklistsSep 1-7: 14% of 14567 checklistsSep 8-14: 11% of 14520 checklistsSep 15-21: 8.3% of 14339 checklistsSep 22-30: 6.2% of 16879 checklistsOct 1-7: 3.9% of 12959 checklistsOct 8-14: 2.9% of 13168 checklistsOct 15-21: 2.2% of 11184 checklistsOct 22-31: 1.3% of 13717 checklistsNov 1-7: 0.3% of 9823 checklistsNov 8-14: 0.2% of 9007 checklistsNov 15-21: 0.1% of 8528 checklistsNov 22-30: 0% of 10228 checklistsDec 1-7: 0% of 7505 checklistsDec 8-14: 0% of 7982 checklistsDec 15-21: 0% of 10455 checklistsDec 22-31: 0% of 14285 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 Maine 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 Maine

Best counties

Share of checklists at the peak
  1. York CountyBest late August · 2683 checklists that week, 101,844 in all37%
  2. Sagadahoc CountyBest late August · 625 checklists that week, 21,736 in all21%
  3. Cumberland CountyBest mid August · 2737 checklists that week, 169,501 in all20%
  4. Knox CountyBest late August · 1175 checklists that week, 34,453 in all19%
  5. Washington CountyBest mid August · 1234 checklists that week, 35,967 in all19%
  6. Waldo CountyBest late August · 860 checklists that week, 33,433 in all7.3%

Best spots

Share of checklists at the peak
  1. Back BayYork County, best late July · 149 checklists that week, 1,607 in all86%
  2. Great PondYork County, best late August · 72 checklists that week, 1,642 in all85%
  3. Scarborough Wildlife Management AreaCumberland County, best early August · 31 checklists that week, 193 in all84%
  4. Great Pond (Libbyshears)York County, best late August · 59 checklists that week, 1,215 in all82%
  5. Cobscook Bay Wildlife Management AreaWashington County, best late August · 76 checklists that week, 569 in all81%

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

Best time of day

In Maine, the Semipalmated Sandpiper is most often listed on checklists started between 5 and 7 pm (3.5% of those checklists).

0%1%2%3%4%12 am: too few checklists (510) to judge1 am: too few checklists (517) to judge2 am: too few checklists (581) to judge3 am: too few checklists (3242) to judge4 am: too few checklists (7221) to judge5 am: 2.0% of 19895 checklists6 am: 2.9% of 54578 checklists7 am: 2.6% of 92775 checklists8 am: 2.6% of 86962 checklists9 am: 2.6% of 78989 checklists10 am: 2.5% of 70954 checklists11 am: 2.4% of 59331 checklists12 pm: 2.2% of 50943 checklists1 pm: 2.3% of 49775 checklists2 pm: 2.5% of 49001 checklists3 pm: 2.6% of 43252 checklists4 pm: 3.1% of 33413 checklists5 pm: 3.8% of 25547 checklists6 pm: 3.2% of 18309 checklists7 pm: too few checklists (14287) to judge8 pm: too few checklists (5336) to judge9 pm: too few checklists (2253) to judge10 pm: too few checklists (1518) to judge11 pm: too few checklists (720) 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%0%0%
April0%0%0%0%
May0.1%0.2%1.1%1.6%
June1.1%0.7%0.3%0.1%
July0.2%1.4%3.7%7.0%
August9.9%11%14%14%
September14%11%8.3%6.2%
October3.9%2.9%2.2%1.3%
November0.3%0.2%0.1%0%
December0%0%0%0%

Neighboring states

  • New Hampshire: arrives mid July, 1 week later than Maine
  • Massachusetts: arrives early July, 1 week earlier than Maine
  • Vermont: arrives late July, 2 weeks later than Maine
  • Rhode Island: arrives the second week of May, 8 weeks earlier than Maine

Common questions

When do Semipalmated Sandpipers arrive in Maine?
Semipalmated Sandpipers reach Maine in the second week of July, are common by late July, peak in late August (14% of checklists), and most are gone by late September.
When do Semipalmated Sandpipers leave Maine?
Most Semipalmated Sandpipers have left Maine by late September, when reports fall below half their usual rate. Stragglers are still reported until late October.
When is the best time to see a Semipalmated Sandpiper in Maine?
The Semipalmated Sandpiper is reported most often in late August, on about 14% of Maine checklists.
Where in Maine are Semipalmated Sandpipers seen most often?
By county, York County, Sagadahoc County, and Cumberland County have the highest peak reporting rates for the Semipalmated Sandpiper (counties with at least 200 checklists).