WhenToBird

Gavia immer · Gaviidae

When Do Common Loons Arrive in Vermont?

Adult Common Loon
Photo: Hungry-Sarracenia Photo, CC BY 4.0 via iNaturalist

Common Loons are winter birds in Vermont: the first arrive in early April, they are common by the second week of April, peak in early November (10% of checklists), and most are gone by the second week of January.

When to look

First arrivalsApr 1-7early April
Common byApr 8-14the second week of April
PeakNov 1-7early November
Most gone byJan 8-14the second week of January

Best: early November. First arrivals early April; most are gone by the second week of January. Peak: on about 10% of Vermont checklists.

  1. Januncommon
  2. Febrare
  3. Marrare
  4. Aprcommon
  5. Maycommon
  6. Juncommon
  7. Julcommon
  8. Augcommon
  9. Sepcommon
  10. Octpeak season
  11. Novpeak season
  12. Deccommon

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

0%5%10%15%Jan 1-7: 4.0% of 12234 checklistsJan 8-14: 2.6% of 8293 checklistsJan 15-21: 2.3% of 7885 checklistsJan 22-31: 1.3% of 10534 checklistsFeb 1-7: 0.7% of 7212 checklistsFeb 8-14: 1.0% of 8144 checklistsFeb 15-21: 0.6% of 10480 checklistsFeb 22-28: 0.9% of 7932 checklistsMar 1-7: 0.9% of 8192 checklistsMar 8-14: 0.6% of 9383 checklistsMar 15-21: 0.4% of 10620 checklistsMar 22-31: 0.5% of 16257 checklistsApr 1-7: 1.1% of 12568 checklistsApr 8-14: 2.7% of 14677 checklistsApr 15-21: 4.0% of 14106 checklistsApr 22-30: 4.5% of 19617 checklistsMay 1-7: 4.6% of 18143 checklistsMay 8-14: 3.7% of 19626 checklistsMay 15-21: 3.6% of 17779 checklistsMay 22-31: 4.2% of 20310 checklistsJun 1-7: 3.4% of 11493 checklistsJun 8-14: 3.7% of 10215 checklistsJun 15-21: 4.2% of 9951 checklistsJun 22-30: 4.3% of 11050 checklistsJul 1-7: 4.5% of 8690 checklistsJul 8-14: 4.5% of 7679 checklistsJul 15-21: 6.5% of 7687 checklistsJul 22-31: 4.4% of 10712 checklistsAug 1-7: 4.8% of 7703 checklistsAug 8-14: 5.0% of 7743 checklistsAug 15-21: 4.7% of 8314 checklistsAug 22-31: 4.3% of 12428 checklistsSep 1-7: 4.7% of 9526 checklistsSep 8-14: 4.7% of 8493 checklistsSep 15-21: 4.4% of 8283 checklistsSep 22-30: 4.4% of 10352 checklistsOct 1-7: 4.5% of 8802 checklistsOct 8-14: 5.2% of 9088 checklistsOct 15-21: 7.5% of 7739 checklistsOct 22-31: 10% of 10907 checklistsNov 1-7: 11% of 7868 checklistsNov 8-14: 9.7% of 7223 checklistsNov 15-21: 8.6% of 7224 checklistsNov 22-30: 6.8% of 8375 checklistsDec 1-7: 5.0% of 6580 checklistsDec 8-14: 3.4% of 6800 checklistsDec 15-21: 2.3% of 8334 checklistsDec 22-31: 2.9% of 10579 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 Vermont 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 Vermont

Best counties

Share of checklists at the peak
  1. Grand Isle CountyBest early November · 142 checklists that week, 8,507 in all41%
  2. Orleans CountyBest late October · 270 checklists that week, 11,785 in all32%
  3. Essex CountyBest late October · 201 checklists that week, 9,416 in all25%
  4. Orange CountyBest early November · 192 checklists that week, 16,964 in all21%
  5. Chittenden CountyBest the second week of November · 1581 checklists that week, 109,477 in all15%
  6. Caledonia CountyBest the second week of July · 241 checklists that week, 10,534 in all15%

Best spots

Share of checklists at the peak
  1. Lake MoreyOrange County, best late October · 34 checklists that week, 505 in all94%
  2. Town Farm BayChittenden County, best early November · 35 checklists that week, 361 in all94%
  3. Barre City ForestOrange County, best late April · 21 checklists that week, 585 in all89%
  4. Kent PondRutland County, best late August · 24 checklists that week, 571 in all87%
  5. Spaulding BayAddison County, best the second week of November · 26 checklists that week, 322 in all86%
  6. Town Farm Bay (Flat Rock)Chittenden County, best early November · 25 checklists that week, 191 in all84%

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

Best time of day

In Vermont, the Common Loon is most often listed on checklists started between 5 and 7 am (4.5% of those checklists).

0%2%4%6%12 am: too few checklists (384) to judge1 am: too few checklists (418) to judge2 am: too few checklists (568) to judge3 am: too few checklists (1183) to judge4 am: too few checklists (3460) to judge5 am: 4.3% of 10340 checklists6 am: 4.6% of 30951 checklists7 am: 3.7% of 64150 checklists8 am: 3.3% of 70252 checklists9 am: 4.0% of 55280 checklists10 am: 4.5% of 47111 checklists11 am: 4.4% of 37615 checklists12 pm: 4.4% of 32195 checklists1 pm: 4.1% of 30185 checklists2 pm: 4.2% of 29679 checklists3 pm: 4.4% of 26483 checklists4 pm: 3.6% of 20110 checklists5 pm: 3.5% of 15993 checklists6 pm: 3.1% of 12110 checklists7 pm: too few checklists (8203) to judge8 pm: too few checklists (4425) to judge9 pm: too few checklists (1829) to judge10 pm: too few checklists (597) to judge11 pm: too few checklists (309) 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
January4.0%2.6%2.3%1.3%
February0.7%1.0%0.6%0.9%
March0.9%0.6%0.4%0.5%
April1.1%2.7%4.0%4.5%
May4.6%3.7%3.6%4.2%
June3.4%3.7%4.2%4.3%
July4.5%4.5%6.5%4.4%
August4.8%5.0%4.7%4.3%
September4.7%4.7%4.4%4.4%
October4.5%5.2%7.5%10%
November11%9.7%8.6%6.8%
December5.0%3.4%2.3%2.9%

Neighboring states

  • New Hampshire: arrives mid October, 22 weeks earlier than Vermont
  • Massachusetts: arrives late September, 23 weeks later than Vermont
  • Connecticut: arrives mid October, 22 weeks earlier than Vermont
  • Rhode Island: arrives the second week of October, 23 weeks earlier than Vermont

Common questions

When do Common Loons arrive in Vermont?
Common Loons are winter birds in Vermont: the first arrive in early April, they are common by the second week of April, peak in early November (10% of checklists), and most are gone by the second week of January.
When do Common Loons leave Vermont?
Most Common Loons have left Vermont by the second week of January, when reports fall below half their usual rate. Stragglers are still reported until early February.
When is the best time to see a Common Loon in Vermont?
The Common Loon is reported most often in early November, on about 10% of Vermont checklists.
Where in Vermont are Common Loons seen most often?
By county, Grand Isle County, Orleans County, and Essex County have the highest peak reporting rates for the Common Loon (counties with at least 200 checklists).