WhenToBird

Gavia stellata · Gaviidae

When Do Red-throated Loons Arrive in Connecticut?

Adult Red-throated Loon
Photo: Elizabeth Green, CC BY 4.0 via iNaturalist

Red-throated Loons are winter birds in Connecticut: the first arrive in mid October, they are common by early November, peak in early December (5.3% of checklists), and most are gone by the second week of April.

When to look

First arrivalsOct 15-21mid October
Common byNov 1-7early November
PeakDec 1-7early December
Most gone byApr 8-14the second week of April

Best: early December. First arrivals mid October; most are gone by the second week of April. Peak: on about 5.3% of Connecticut checklists.

  1. Janpeak season
  2. Febcommon
  3. Marpeak season
  4. Aprpeak season
  5. Mayrare
  6. Junnot usually seen
  7. Julnot usually seen
  8. Augnot usually seen
  9. Sepnot usually seen
  10. Octuncommon
  11. Novpeak season
  12. Decpeak season

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

0%2%4%6%8%Jan 1-7: 4.9% of 18950 checklistsJan 8-14: 4.6% of 13676 checklistsJan 15-21: 4.3% of 13377 checklistsJan 22-31: 4.4% of 17004 checklistsFeb 1-7: 3.8% of 10218 checklistsFeb 8-14: 2.9% of 11568 checklistsFeb 15-21: 2.2% of 15916 checklistsFeb 22-28: 2.5% of 11413 checklistsMar 1-7: 3.2% of 10754 checklistsMar 8-14: 2.7% of 12051 checklistsMar 15-21: 3.7% of 12616 checklistsMar 22-31: 4.8% of 17801 checklistsApr 1-7: 4.3% of 13186 checklistsApr 8-14: 3.3% of 14428 checklistsApr 15-21: 1.8% of 14738 checklistsApr 22-30: 0.9% of 21753 checklistsMay 1-7: 0.6% of 22494 checklistsMay 8-14: 0.4% of 23363 checklistsMay 15-21: 0.2% of 20219 checklistsMay 22-31: 0.1% of 20778 checklistsJun 1-7: 0.1% of 12234 checklistsJun 8-14: 0.1% of 12491 checklistsJun 15-21: 0.1% of 10856 checklistsJun 22-30: 0% of 11964 checklistsJul 1-7: 0% of 9437 checklistsJul 8-14: 0.1% of 8599 checklistsJul 15-21: 0% of 8252 checklistsJul 22-31: 0.1% of 11329 checklistsAug 1-7: 0.1% of 8116 checklistsAug 8-14: 0% of 8051 checklistsAug 15-21: 0% of 8502 checklistsAug 22-31: 0% of 13673 checklistsSep 1-7: 0.1% of 9873 checklistsSep 8-14: 0.1% of 9735 checklistsSep 15-21: 0% of 10120 checklistsSep 22-30: 0.1% of 12543 checklistsOct 1-7: 0.1% of 10735 checklistsOct 8-14: 0.3% of 10869 checklistsOct 15-21: 0.6% of 10436 checklistsOct 22-31: 1.9% of 13808 checklistsNov 1-7: 2.9% of 10507 checklistsNov 8-14: 4.3% of 9827 checklistsNov 15-21: 4.5% of 9904 checklistsNov 22-30: 5.0% of 13396 checklistsDec 1-7: 6.1% of 8974 checklistsDec 8-14: 4.9% of 9468 checklistsDec 15-21: 4.4% of 11614 checklistsDec 22-31: 5.0% of 16616 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 Connecticut 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 Connecticut

Best counties

Share of checklists at the peak
  1. New London CountyBest mid January · 1490 checklists that week, 65,205 in all10%
  2. Middlesex CountyBest early January · 1226 checklists that week, 39,919 in all9.1%
  3. New Haven CountyBest late March · 4100 checklists that week, 139,721 in all8.9%
  4. Fairfield CountyBest late November · 3132 checklists that week, 139,848 in all8.2%
  5. Litchfield CountyBest mid November · 1043 checklists that week, 69,766 in all1.5%
  6. Tolland CountyBest the second week of May · 1577 checklists that week, 39,004 in all0.3%

Best spots

Share of checklists at the peak
  1. Saybrook Point (Gibralter Rocks)Middlesex County, best early January · 32 checklists that week, 224 in all70%
  2. Cornfield PointMiddlesex County, best late January · 24 checklists that week, 382 in all70%
  3. Point No PointFairfield County, best the second week of April · 29 checklists that week, 1,401 in all65%
  4. Hammonasset Natural Area Preserve (Hammonasset Point)New Haven County, best the second week of December · 40 checklists that week, 1,736 in all64%
  5. Saybrook PointMiddlesex County, best the second week of February · 24 checklists that week, 559 in all62%
  6. Stonington PointNew London County, best early December · 53 checklists that week, 1,092 in all62%

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

Best time of day

In Connecticut, the Red-throated Loon is most often listed on checklists started between 1 and 3 pm (2.6% of those checklists).

0%1%2%3%12 am: too few checklists (325) to judge1 am: too few checklists (367) to judge2 am: too few checklists (488) to judge3 am: too few checklists (792) to judge4 am: too few checklists (2722) to judge5 am: too few checklists (9489) to judge6 am: 1.0% of 33657 checklists7 am: 1.8% of 62964 checklists8 am: 2.3% of 70645 checklists9 am: 2.4% of 64870 checklists10 am: 2.5% of 58827 checklists11 am: 2.6% of 51689 checklists12 pm: 2.5% of 45288 checklists1 pm: 2.6% of 44765 checklists2 pm: 2.6% of 44173 checklists3 pm: 2.3% of 41979 checklists4 pm: 1.3% of 33219 checklists5 pm: 0.8% of 24828 checklists6 pm: 0.4% of 15856 checklists7 pm: too few checklists (8126) to judge8 pm: too few checklists (1994) to judge9 pm: too few checklists (533) to judge10 pm: too few checklists (349) to judge11 pm: too few checklists (286) 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
January4.9%4.6%4.3%4.4%
February3.8%2.9%2.2%2.5%
March3.2%2.7%3.7%4.8%
April4.3%3.3%1.8%0.9%
May0.6%0.4%0.2%0.1%
June0.1%0.1%0.1%0%
July0%0.1%0%0.1%
August0.1%0%0%0%
September0.1%0.1%0%0.1%
October0.1%0.3%0.6%1.9%
November2.9%4.3%4.5%5.0%
December6.1%4.9%4.4%5.0%

Neighboring states

  • Rhode Island: arrives mid October, in the same week than Connecticut
  • Massachusetts: arrives mid October, in the same week than Connecticut
  • New Jersey: arrives mid October, in the same week than Connecticut
  • New York: arrives late October, 1 week later than Connecticut

Common questions

When do Red-throated Loons arrive in Connecticut?
Red-throated Loons are winter birds in Connecticut: the first arrive in mid October, they are common by early November, peak in early December (5.3% of checklists), and most are gone by the second week of April.
When do Red-throated Loons leave Connecticut?
Most Red-throated Loons have left Connecticut by the second week of April, when reports fall below half their usual rate. Stragglers are still reported until late April.
When is the best time to see a Red-throated Loon in Connecticut?
The Red-throated Loon is reported most often in early December, on about 5.3% of Connecticut checklists.
Where in Connecticut are Red-throated Loons seen most often?
By county, New London County, Middlesex County, and New Haven County have the highest peak reporting rates for the Red-throated Loon (counties with at least 200 checklists).