WhenToBird

Certhia americana · Certhiidae

When Do Brown Creepers Arrive in Massachusetts?

Adult Brown Creeper
Photo: Melanie Gaddy, CC0 1.0 via iNaturalist

Brown Creepers reach Massachusetts in late August, are common by mid September, peak in the second week of April (8.5% of checklists), and most are gone by late June.

When to look

First arrivalsAug 22-31late August
Common bySep 15-21mid September
PeakApr 8-14the second week of April
Most gone byJun 22-30late June

Best: the second week of April. First arrivals late August; most are gone by late June. Peak: on about 8.5% of Massachusetts checklists.

  1. Jancommon
  2. Febcommon
  3. Marcommon
  4. Aprpeak season
  5. Maycommon
  6. Juncommon
  7. Juluncommon
  8. Auguncommon
  9. Sepcommon
  10. Octcommon
  11. Novcommon
  12. Deccommon

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

0%5%10%Jan 1-7: 3.9% of 43252 checklistsJan 8-14: 3.5% of 30096 checklistsJan 15-21: 3.8% of 28760 checklistsJan 22-31: 3.5% of 38135 checklistsFeb 1-7: 3.7% of 26442 checklistsFeb 8-14: 3.7% of 29034 checklistsFeb 15-21: 3.5% of 37383 checklistsFeb 22-28: 4.0% of 29977 checklistsMar 1-7: 4.6% of 29175 checklistsMar 8-14: 4.7% of 32399 checklistsMar 15-21: 5.3% of 34444 checklistsMar 22-31: 6.3% of 49126 checklistsApr 1-7: 6.8% of 36456 checklistsApr 8-14: 9.5% of 40908 checklistsApr 15-21: 9.1% of 42078 checklistsApr 22-30: 6.8% of 56465 checklistsMay 1-7: 5.2% of 56994 checklistsMay 8-14: 3.8% of 64079 checklistsMay 15-21: 3.8% of 52020 checklistsMay 22-31: 4.2% of 55402 checklistsJun 1-7: 4.1% of 30682 checklistsJun 8-14: 4.1% of 27557 checklistsJun 15-21: 4.2% of 26163 checklistsJun 22-30: 3.5% of 29576 checklistsJul 1-7: 2.9% of 23931 checklistsJul 8-14: 2.3% of 22389 checklistsJul 15-21: 2.3% of 22365 checklistsJul 22-31: 2.0% of 32631 checklistsAug 1-7: 1.9% of 25133 checklistsAug 8-14: 1.8% of 24610 checklistsAug 15-21: 1.9% of 25350 checklistsAug 22-31: 2.1% of 37198 checklistsSep 1-7: 2.4% of 27402 checklistsSep 8-14: 2.6% of 27700 checklistsSep 15-21: 3.2% of 28398 checklistsSep 22-30: 3.8% of 34646 checklistsOct 1-7: 5.5% of 28620 checklistsOct 8-14: 5.3% of 30144 checklistsOct 15-21: 5.9% of 28893 checklistsOct 22-31: 5.6% of 38869 checklistsNov 1-7: 5.4% of 29782 checklistsNov 8-14: 5.0% of 27582 checklistsNov 15-21: 5.1% of 26642 checklistsNov 22-30: 4.9% of 34390 checklistsDec 1-7: 4.1% of 25164 checklistsDec 8-14: 4.4% of 24892 checklistsDec 15-21: 5.5% of 29022 checklistsDec 22-31: 4.7% of 44323 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 Massachusetts 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 Massachusetts

Best counties

Share of checklists at the peak
  1. Hampden CountyBest the second week of December · 423 checklists that week, 35,410 in all12%
  2. Hampshire CountyBest the second week of April · 4013 checklists that week, 162,423 in all11%
  3. Worcester CountyBest the second week of April · 3378 checklists that week, 128,594 in all11%
  4. Essex CountyBest mid April · 5606 checklists that week, 213,973 in all11%
  5. Berkshire CountyBest mid April · 2632 checklists that week, 92,890 in all10%
  6. Franklin CountyBest mid April · 1329 checklists that week, 41,382 in all9.6%

Best spots

Share of checklists at the peak
  1. J. C. Phillips SanctuaryEssex County, best early April · 69 checklists that week, 1,160 in all84%
  2. Tophet SwampMiddlesex County, best the second week of April · 26 checklists that week, 317 in all77%
  3. Annursnac Conservation LandMiddlesex County, best late May · 20 checklists that week, 109 in all77%
  4. F. Gilbert Hills State ForestNorfolk County, best mid April · 26 checklists that week, 264 in all73%
  5. Memorial ForestMiddlesex County, best late March · 25 checklists that week, 564 in all71%
  6. Blueberry HillEssex County, best mid March · 21 checklists that week, 649 in all70%

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

Best time of day

In Massachusetts, the Brown Creeper is most often listed on checklists started between 6 and 8 am (6.0% of those checklists).

0%2%4%6%8%12 am: too few checklists (630) to judge1 am: too few checklists (657) to judge2 am: too few checklists (645) to judge3 am: too few checklists (850) to judge4 am: too few checklists (3787) to judge5 am: too few checklists (29743) to judge6 am: 6.4% of 108601 checklists7 am: 5.8% of 186104 checklists8 am: 5.1% of 185905 checklists9 am: 4.8% of 166049 checklists10 am: 4.6% of 150508 checklists11 am: 4.3% of 131024 checklists12 pm: 4.1% of 116804 checklists1 pm: 4.2% of 112055 checklists2 pm: 3.9% of 110246 checklists3 pm: 3.6% of 104376 checklists4 pm: 3.0% of 83736 checklists5 pm: 2.7% of 63723 checklists6 pm: 1.9% of 41435 checklists7 pm: too few checklists (21041) to judge8 pm: too few checklists (5240) to judge9 pm: too few checklists (1722) to judge10 pm: too few checklists (1094) to judge11 pm: too few checklists (704) 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
January3.9%3.5%3.8%3.5%
February3.7%3.7%3.5%4.0%
March4.6%4.7%5.3%6.3%
April6.8%9.5%9.1%6.8%
May5.2%3.8%3.8%4.2%
June4.1%4.1%4.2%3.5%
July2.9%2.3%2.3%2.0%
August1.9%1.8%1.9%2.1%
September2.4%2.6%3.2%3.8%
October5.5%5.3%5.9%5.6%
November5.4%5.0%5.1%4.9%
December4.1%4.4%5.5%4.7%

Neighboring states

  • Rhode Island: arrives the second week of September, 2 weeks later than Massachusetts
  • New Hampshire: arrives mid March, 21 weeks earlier than Massachusetts
  • Connecticut: arrives late August, in the same week than Massachusetts
  • Vermont: arrives late March, 20 weeks earlier than Massachusetts

Common questions

When do Brown Creepers arrive in Massachusetts?
Brown Creepers reach Massachusetts in late August, are common by mid September, peak in the second week of April (8.5% of checklists), and most are gone by late June.
When do Brown Creepers leave Massachusetts?
Most Brown Creepers have left Massachusetts by late June, when reports fall below half their usual rate. Stragglers are still reported until mid July.
When is the best time to see a Brown Creeper in Massachusetts?
The Brown Creeper is reported most often in the second week of April, on about 8.5% of Massachusetts checklists.
Where in Massachusetts are Brown Creepers seen most often?
By county, Hampden County, Hampshire County, and Worcester County have the highest peak reporting rates for the Brown Creeper (counties with at least 200 checklists).