WhenToBird

Thryothorus ludovicianus · Troglodytidae

When Do Carolina Wrens Arrive in Maine?

Adult Carolina Wren
Photo: northerly, CC BY 4.0 via iNaturalist

Carolina Wrens reach Maine in the second week of July, are common by early August, peak in late September (5.9% of checklists), and most are gone by late May.

When to look

First arrivalsJul 8-14the second week of July
Common byAug 1-7early August
PeakSep 22-30late September
Most gone byMay 22-31late May

Best: late September. First arrivals the second week of July; most are gone by late May. Peak: on about 5.9% of Maine checklists.

  1. Jancommon
  2. Febcommon
  3. Marcommon
  4. Aprcommon
  5. Maypeak season
  6. Jununcommon
  7. Julcommon
  8. Augcommon
  9. Seppeak season
  10. Octpeak season
  11. Novpeak season
  12. Decpeak season

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

0%2%4%6%8%Jan 1-7: 2.9% of 15499 checklistsJan 8-14: 3.0% of 11141 checklistsJan 15-21: 2.9% of 10729 checklistsJan 22-31: 3.2% of 15084 checklistsFeb 1-7: 3.6% of 9403 checklistsFeb 8-14: 3.6% of 11268 checklistsFeb 15-21: 3.8% of 14061 checklistsFeb 22-28: 3.2% of 9977 checklistsMar 1-7: 3.0% of 9649 checklistsMar 8-14: 3.1% of 11781 checklistsMar 15-21: 3.4% of 11613 checklistsMar 22-31: 3.0% of 17798 checklistsApr 1-7: 2.7% of 14638 checklistsApr 8-14: 3.4% of 16511 checklistsApr 15-21: 3.6% of 17164 checklistsApr 22-30: 4.3% of 22602 checklistsMay 1-7: 4.7% of 22556 checklistsMay 8-14: 4.7% of 27842 checklistsMay 15-21: 4.5% of 27748 checklistsMay 22-31: 2.9% of 38715 checklistsJun 1-7: 1.6% of 26916 checklistsJun 8-14: 1.5% of 23737 checklistsJun 15-21: 1.6% of 22733 checklistsJun 22-30: 1.5% of 28248 checklistsJul 1-7: 2.0% of 20290 checklistsJul 8-14: 1.6% of 18534 checklistsJul 15-21: 2.1% of 17319 checklistsJul 22-31: 2.2% of 22815 checklistsAug 1-7: 2.9% of 15004 checklistsAug 8-14: 2.9% of 14603 checklistsAug 15-21: 3.1% of 14972 checklistsAug 22-31: 3.7% of 19813 checklistsSep 1-7: 4.0% of 14567 checklistsSep 8-14: 4.8% of 14520 checklistsSep 15-21: 5.1% of 14339 checklistsSep 22-30: 6.6% of 16879 checklistsOct 1-7: 5.7% of 12959 checklistsOct 8-14: 4.7% of 13168 checklistsOct 15-21: 5.0% of 11184 checklistsOct 22-31: 5.7% of 13717 checklistsNov 1-7: 5.9% of 9823 checklistsNov 8-14: 5.3% of 9007 checklistsNov 15-21: 5.1% of 8528 checklistsNov 22-30: 5.3% of 10228 checklistsDec 1-7: 5.1% of 7505 checklistsDec 8-14: 5.5% of 7982 checklistsDec 15-21: 5.1% of 10455 checklistsDec 22-31: 3.8% 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. Lincoln CountyBest mid September · 1659 checklists that week, 59,429 in all17%
  2. York CountyBest the second week of October · 1847 checklists that week, 101,844 in all14%
  3. Cumberland CountyBest late October · 3287 checklists that week, 169,501 in all9.3%
  4. Sagadahoc CountyBest late October · 300 checklists that week, 21,736 in all6.7%
  5. Androscoggin CountyBest the second week of May · 810 checklists that week, 16,955 in all6.5%
  6. Waldo CountyBest the second week of December · 394 checklists that week, 33,433 in all5.4%

Best spots

Share of checklists at the peak
  1. Monhegan IslandLincoln County, best late April · 21 checklists that week, 4,434 in all78%
  2. Pumgustuck (Royal River Reservoir)Cumberland County, best early November · 71 checklists that week, 195 in all72%
  3. Appledore IslandYork County, best early September · 72 checklists that week, 422 in all72%
  4. Staples Cove (Hunts Point)Cumberland County, best the second week of January · 70 checklists that week, 146 in all56%
  5. Fort Foster ParkYork County, best late November · 69 checklists that week, 2,318 in all55%

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

Best time of day

In Maine, the Carolina Wren is most often listed on checklists started between 5 and 7 am (5.8% of those checklists).

0%2%4%6%8%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: 5.1% of 19895 checklists6 am: 6.1% of 54578 checklists7 am: 4.7% of 92775 checklists8 am: 4.5% of 86962 checklists9 am: 4.0% of 78989 checklists10 am: 3.5% of 70954 checklists11 am: 3.0% of 59331 checklists12 pm: 2.9% of 50943 checklists1 pm: 2.7% of 49775 checklists2 pm: 2.4% of 49001 checklists3 pm: 2.2% of 43252 checklists4 pm: 2.1% of 33413 checklists5 pm: 2.2% of 25547 checklists6 pm: 2.2% 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
January2.9%3.0%2.9%3.2%
February3.6%3.6%3.8%3.2%
March3.0%3.1%3.4%3.0%
April2.7%3.4%3.6%4.3%
May4.7%4.7%4.5%2.9%
June1.6%1.5%1.6%1.5%
July2.0%1.6%2.1%2.2%
August2.9%2.9%3.1%3.7%
September4.0%4.8%5.1%6.6%
October5.7%4.7%5.0%5.7%
November5.9%5.3%5.1%5.3%
December5.1%5.5%5.1%3.8%

Neighboring states

Common questions

When do Carolina Wrens arrive in Maine?
Carolina Wrens reach Maine in the second week of July, are common by early August, peak in late September (5.9% of checklists), and most are gone by late May.
When do Carolina Wrens leave Maine?
Most Carolina Wrens have left Maine by late May, when reports fall below half their usual rate. Stragglers are still reported until early June.
When is the best time to see a Carolina Wren in Maine?
The Carolina Wren is reported most often in late September, on about 5.9% of Maine checklists.
Where in Maine are Carolina Wrens seen most often?
By county, Lincoln County, York County, and Cumberland County have the highest peak reporting rates for the Carolina Wren (counties with at least 200 checklists).