WhenToBird

Archilochus colubris · Trochilidae

When Do Ruby-throated Hummingbirds Arrive in Massachusetts?

Adult male Ruby-throated Hummingbird
Photo: David Bird, CC0 1.0 via iNaturalist

Ruby-throated Hummingbirds reach Massachusetts in late April, are common by early May, peak in mid August (24% of checklists), and most are gone by mid September.

When to look

First arrivalsApr 22-30late April
Common byMay 1-7early May
PeakAug 15-21mid August
Most gone bySep 15-21mid September

Best: mid August. First arrivals late April; most are gone by mid September. Peak: on about 24% of Massachusetts checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Aprrare
  5. Maycommon
  6. Juncommon
  7. Julpeak season
  8. Augpeak season
  9. Seppeak season
  10. Octrare
  11. Novnot usually seen
  12. Decnot usually seen

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

0%10%20%30%Jan 1-7: 0% of 43252 checklistsJan 8-14: 0% of 30096 checklistsJan 15-21: 0% of 28760 checklistsJan 22-31: 0% of 38135 checklistsFeb 1-7: 0% of 26442 checklistsFeb 8-14: 0% of 29034 checklistsFeb 15-21: 0% of 37383 checklistsFeb 22-28: 0% of 29977 checklistsMar 1-7: 0% of 29175 checklistsMar 8-14: 0% of 32399 checklistsMar 15-21: 0% of 34444 checklistsMar 22-31: 0% of 49126 checklistsApr 1-7: 0% of 36456 checklistsApr 8-14: 0.1% of 40908 checklistsApr 15-21: 0.1% of 42078 checklistsApr 22-30: 1.3% of 56465 checklistsMay 1-7: 7.2% of 56994 checklistsMay 8-14: 13% of 64079 checklistsMay 15-21: 16% of 52020 checklistsMay 22-31: 14% of 55402 checklistsJun 1-7: 12% of 30682 checklistsJun 8-14: 12% of 27557 checklistsJun 15-21: 13% of 26163 checklistsJun 22-30: 13% of 29576 checklistsJul 1-7: 14% of 23931 checklistsJul 8-14: 14% of 22389 checklistsJul 15-21: 16% of 22365 checklistsJul 22-31: 19% of 32631 checklistsAug 1-7: 20% of 25133 checklistsAug 8-14: 22% of 24610 checklistsAug 15-21: 24% of 25350 checklistsAug 22-31: 25% of 37198 checklistsSep 1-7: 21% of 27402 checklistsSep 8-14: 16% of 27700 checklistsSep 15-21: 8.2% of 28398 checklistsSep 22-30: 2.6% of 34646 checklistsOct 1-7: 0.5% of 28620 checklistsOct 8-14: 0.1% of 30144 checklistsOct 15-21: 0.1% of 28893 checklistsOct 22-31: 0.1% of 38869 checklistsNov 1-7: 0.1% of 29782 checklistsNov 8-14: 0.1% of 27582 checklistsNov 15-21: 0.1% of 26642 checklistsNov 22-30: 0.1% of 34390 checklistsDec 1-7: 0.1% of 25164 checklistsDec 8-14: 0.1% of 24892 checklistsDec 15-21: 0.1% of 29022 checklistsDec 22-31: 0% 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 August · 2460 checklists that week, 162,423 in all34%
  2. Worcester CountyBest mid August · 1660 checklists that week, 128,594 in all31%
  3. Franklin CountyBest mid August · 504 checklists that week, 41,382 in all31%
  4. Bristol CountyBest mid August · 908 checklists that week, 65,262 in all30%
  5. Berkshire CountyBest mid August · 1629 checklists that week, 92,890 in all28%
  6. Middlesex CountyBest mid August · 4021 checklists that week, 307,511 in all28%

Best spots

Share of checklists at the peak
  1. Cow CommonMiddlesex County, best late August · 22 checklists that week, 667 in all74%
  2. Poppasguash SwampBristol County, best late August · 41 checklists that week, 2,031 in all70%
  3. Mclean Hospital Open SpaceMiddlesex County, best early September · 43 checklists that week, 1,902 in all68%
  4. Martins PondMiddlesex County, best mid August · 41 checklists that week, 1,739 in all67%
  5. Parker Street Swamp (historical)Middlesex County, best mid August · 20 checklists that week, 2,153 in all67%
  6. Connecticut River Greenway State ParkHampshire County, best early September · 21 checklists that week, 1,783 in all66%

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

Best time of day

In Massachusetts, the Ruby-throated Hummingbird is most often listed on checklists started between 6 and 8 am (9.9% of those checklists).

0%5%10%15%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: 13% of 108601 checklists7 am: 8.0% of 186104 checklists8 am: 6.5% of 185905 checklists9 am: 5.1% of 166049 checklists10 am: 4.1% of 150508 checklists11 am: 3.6% of 131024 checklists12 pm: 3.5% of 116804 checklists1 pm: 3.5% of 112055 checklists2 pm: 3.3% of 110246 checklists3 pm: 4.1% of 104376 checklists4 pm: 5.6% of 83736 checklists5 pm: 8.1% of 63723 checklists6 pm: 10% 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%0%0%0%
February0%0%0%0%
March0%0%0%0%
April0%0.1%0.1%1.3%
May7.2%13%16%14%
June12%12%13%13%
July14%14%16%19%
August20%22%24%25%
September21%16%8.2%2.6%
October0.5%0.1%0.1%0.1%
November0.1%0.1%0.1%0.1%
December0.1%0.1%0.1%0%

Neighboring states

  • Rhode Island: arrives late April, in the same week than Massachusetts
  • New Hampshire: arrives late April, in the same week than Massachusetts
  • Connecticut: arrives late April, in the same week than Massachusetts
  • Vermont: arrives early May, 1 week later than Massachusetts

Common questions

When do Ruby-throated Hummingbirds arrive in Massachusetts?
Ruby-throated Hummingbirds reach Massachusetts in late April, are common by early May, peak in mid August (24% of checklists), and most are gone by mid September.
When do Ruby-throated Hummingbirds leave Massachusetts?
Most Ruby-throated Hummingbirds have left Massachusetts by mid September, when reports fall below half their usual rate. Stragglers are still reported until late September.
When is the best time to see a Ruby-throated Hummingbird in Massachusetts?
The Ruby-throated Hummingbird is reported most often in mid August, on about 24% of Massachusetts checklists.
Where in Massachusetts are Ruby-throated Hummingbirds seen most often?
By county, Hampshire County, Worcester County, and Franklin County have the highest peak reporting rates for the Ruby-throated Hummingbird (counties with at least 200 checklists).