WhenToBird

Corthylio calendula · Regulidae

When Do Ruby-crowned Kinglets Arrive in Massachusetts?

Adult male Ruby-crowned Kinglet
Photo: Jonathan Eisen, CC BY 4.0 via iNaturalist

Ruby-crowned Kinglets arrive in Massachusetts in early April, peak in late April (18% of checklists), and most are gone by mid May.

When to look

First arrivalsApr 1-7early April
Common byApr 1-7early April
PeakApr 22-30late April
Most gone byMay 15-21mid May

Best: late April. First arrivals early April; most are gone by mid May. Peak: on about 18% of Massachusetts checklists.

  1. Janrare
  2. Febnot usually seen
  3. Marrare
  4. Aprpeak season
  5. Maycommon
  6. Junnot usually seen
  7. Julnot usually seen
  8. Augnot usually seen
  9. Sepuncommon
  10. Octpeak season
  11. Novcommon
  12. Decrare

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

0%10%20%30%Jan 1-7: 0.9% of 43252 checklistsJan 8-14: 0.9% of 30096 checklistsJan 15-21: 0.7% of 28760 checklistsJan 22-31: 0.8% of 38135 checklistsFeb 1-7: 0.6% of 26442 checklistsFeb 8-14: 0.6% of 29034 checklistsFeb 15-21: 0.5% of 37383 checklistsFeb 22-28: 0.6% of 29977 checklistsMar 1-7: 0.6% of 29175 checklistsMar 8-14: 0.6% of 32399 checklistsMar 15-21: 0.6% of 34444 checklistsMar 22-31: 0.7% of 49126 checklistsApr 1-7: 1.6% of 36456 checklistsApr 8-14: 8.6% of 40908 checklistsApr 15-21: 21% of 42078 checklistsApr 22-30: 21% of 56465 checklistsMay 1-7: 13% of 56994 checklistsMay 8-14: 4.7% of 64079 checklistsMay 15-21: 1.3% of 52020 checklistsMay 22-31: 0.1% of 55402 checklistsJun 1-7: 0.1% of 30682 checklistsJun 8-14: 0% of 27557 checklistsJun 15-21: 0% of 26163 checklistsJun 22-30: 0% of 29576 checklistsJul 1-7: 0% of 23931 checklistsJul 8-14: 0% of 22389 checklistsJul 15-21: 0% of 22365 checklistsJul 22-31: 0% of 32631 checklistsAug 1-7: 0.1% of 25133 checklistsAug 8-14: 0.1% of 24610 checklistsAug 15-21: 0% of 25350 checklistsAug 22-31: 0.1% of 37198 checklistsSep 1-7: 0.1% of 27402 checklistsSep 8-14: 0.3% of 27700 checklistsSep 15-21: 2.3% of 28398 checklistsSep 22-30: 6.5% of 34646 checklistsOct 1-7: 13% of 28620 checklistsOct 8-14: 16% of 30144 checklistsOct 15-21: 16% of 28893 checklistsOct 22-31: 13% of 38869 checklistsNov 1-7: 6.2% of 29782 checklistsNov 8-14: 3.4% of 27582 checklistsNov 15-21: 2.4% of 26642 checklistsNov 22-30: 2.2% of 34390 checklistsDec 1-7: 1.8% of 25164 checklistsDec 8-14: 1.6% of 24892 checklistsDec 15-21: 1.8% of 29022 checklistsDec 22-31: 1.4% 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. Hampshire CountyBest mid April · 4381 checklists that week, 162,423 in all28%
  2. Berkshire CountyBest late April · 3552 checklists that week, 92,890 in all26%
  3. Hampden CountyBest mid April · 1026 checklists that week, 35,410 in all25%
  4. Franklin CountyBest late April · 1746 checklists that week, 41,382 in all22%
  5. Worcester CountyBest the second week of October · 2238 checklists that week, 128,594 in all22%
  6. Essex CountyBest late April · 7060 checklists that week, 213,973 in all21%

Best spots

Share of checklists at the peak
  1. Connecticut River Greenway State ParkHampshire County, best mid April · 63 checklists that week, 1,783 in all81%
  2. Marblehead Neck Wildlife SanctuaryEssex County, best mid April · 232 checklists that week, 4,966 in all76%
  3. MerrimacportEssex County, best the second week of January · 43 checklists that week, 111 in all73%
  4. Post FarmBerkshire County, best mid April · 50 checklists that week, 733 in all72%
  5. Norwottuck Rail TrailHampshire County, best mid April · 51 checklists that week, 1,148 in all70%

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

Best time of day

In Massachusetts, the Ruby-crowned Kinglet is most often listed on checklists started between 6 and 8 am (6.5% 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: 6.7% of 108601 checklists7 am: 6.4% of 186104 checklists8 am: 5.5% of 185905 checklists9 am: 4.4% of 166049 checklists10 am: 3.8% of 150508 checklists11 am: 3.3% of 131024 checklists12 pm: 3.1% of 116804 checklists1 pm: 2.9% of 112055 checklists2 pm: 2.8% of 110246 checklists3 pm: 2.7% of 104376 checklists4 pm: 2.9% of 83736 checklists5 pm: 2.5% of 63723 checklists6 pm: 1.2% 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
January0.9%0.9%0.7%0.8%
February0.6%0.6%0.5%0.6%
March0.6%0.6%0.6%0.7%
April1.6%8.6%21%21%
May13%4.7%1.3%0.1%
June0.1%0%0%0%
July0%0%0%0%
August0.1%0.1%0%0.1%
September0.1%0.3%2.3%6.5%
October13%16%16%13%
November6.2%3.4%2.4%2.2%
December1.8%1.6%1.8%1.4%

Neighboring states

  • Rhode Island: arrives mid September, 22 weeks later than Massachusetts
  • New Hampshire: arrives early April, in the same week than Massachusetts
  • Connecticut: arrives the second week of September, 21 weeks later than Massachusetts
  • Vermont: arrives early April, in the same week than Massachusetts

Common questions

When do Ruby-crowned Kinglets arrive in Massachusetts?
Ruby-crowned Kinglets arrive in Massachusetts in early April, peak in late April (18% of checklists), and most are gone by mid May.
When do Ruby-crowned Kinglets leave Massachusetts?
Most Ruby-crowned Kinglets have left Massachusetts by mid May, when reports fall below half their usual rate.
When is the best time to see a Ruby-crowned Kinglet in Massachusetts?
The Ruby-crowned Kinglet is reported most often in late April, on about 18% of Massachusetts checklists.
Where in Massachusetts are Ruby-crowned Kinglets seen most often?
By county, Hampshire County, Berkshire County, and Hampden County have the highest peak reporting rates for the Ruby-crowned Kinglet (counties with at least 200 checklists).