WhenToBird

Ardea herodias · Ardeidae

When Do Great Blue Herons Arrive in Vermont?

Adult Great Blue Heron
Photo: mostbittern, CC BY 4.0 via iNaturalist

Great Blue Herons reach Vermont in mid March, are common by late March, peak in late August (22% of checklists), and most are gone by the second week of November.

When to look

First arrivalsMar 15-21mid March
Common byMar 22-31late March
PeakAug 22-31late August
Most gone byNov 8-14the second week of November

Best: late August. First arrivals mid March; most are gone by the second week of November. Peak: on about 22% of Vermont checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Maruncommon
  4. Aprcommon
  5. Maycommon
  6. Juncommon
  7. Julpeak season
  8. Augpeak season
  9. Seppeak season
  10. Octcommon
  11. Novuncommon
  12. Decrare

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

0%10%20%30%Jan 1-7: 0.5% of 12234 checklistsJan 8-14: 0.3% of 8293 checklistsJan 15-21: 0.1% of 7885 checklistsJan 22-31: 0.1% of 10534 checklistsFeb 1-7: 0.1% of 7212 checklistsFeb 8-14: 0.1% of 8144 checklistsFeb 15-21: 0.1% of 10480 checklistsFeb 22-28: 0.2% of 7932 checklistsMar 1-7: 0.1% of 8192 checklistsMar 8-14: 0.2% of 9383 checklistsMar 15-21: 1.6% of 10620 checklistsMar 22-31: 5.4% of 16257 checklistsApr 1-7: 8.6% of 12568 checklistsApr 8-14: 9.0% of 14677 checklistsApr 15-21: 9.0% of 14106 checklistsApr 22-30: 9.0% of 19617 checklistsMay 1-7: 8.7% of 18143 checklistsMay 8-14: 7.5% of 19626 checklistsMay 15-21: 8.7% of 17779 checklistsMay 22-31: 9.9% of 20310 checklistsJun 1-7: 9.3% of 11493 checklistsJun 8-14: 8.8% of 10215 checklistsJun 15-21: 8.4% of 9951 checklistsJun 22-30: 8.7% of 11050 checklistsJul 1-7: 8.9% of 8690 checklistsJul 8-14: 11% of 7679 checklistsJul 15-21: 14% of 7687 checklistsJul 22-31: 18% of 10712 checklistsAug 1-7: 19% of 7703 checklistsAug 8-14: 20% of 7743 checklistsAug 15-21: 21% of 8314 checklistsAug 22-31: 22% of 12428 checklistsSep 1-7: 22% of 9526 checklistsSep 8-14: 20% of 8493 checklistsSep 15-21: 19% of 8283 checklistsSep 22-30: 17% of 10352 checklistsOct 1-7: 16% of 8802 checklistsOct 8-14: 13% of 9088 checklistsOct 15-21: 11% of 7739 checklistsOct 22-31: 9.2% of 10907 checklistsNov 1-7: 7.1% of 7868 checklistsNov 8-14: 5.7% of 7223 checklistsNov 15-21: 4.0% of 7224 checklistsNov 22-30: 2.5% of 8375 checklistsDec 1-7: 2.3% of 6580 checklistsDec 8-14: 1.8% of 6800 checklistsDec 15-21: 0.9% of 8334 checklistsDec 22-31: 0.7% 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. Franklin CountyBest late August · 610 checklists that week, 25,284 in all43%
  2. Grand Isle CountyBest the second week of September · 139 checklists that week, 8,507 in all38%
  3. Chittenden CountyBest late August · 2535 checklists that week, 109,477 in all33%
  4. Addison CountyBest late August · 2050 checklists that week, 77,064 in all31%
  5. Windham CountyBest mid August · 497 checklists that week, 39,105 in all19%
  6. Orleans CountyBest the second week of August · 230 checklists that week, 11,785 in all18%

Best spots

Share of checklists at the peak
  1. Dead CreekAddison County, best mid September · 23 checklists that week, 337 in all98%
  2. Goose BayFranklin County, best early September · 21 checklists that week, 213 in all98%
  3. Holcomb Slang CreekAddison County, best early August · 25 checklists that week, 503 in all97%
  4. Missisquoi National Wildlife Refuge (Mudgett Island)Franklin County, best mid August · 23 checklists that week, 285 in all95%
  5. Dead Creek Wildlife Management Area (north)Addison County, best late August · 66 checklists that week, 551 in all94%

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

Best time of day

In Vermont, the Great Blue Heron is most often listed on checklists started between 5 and 7 am (11% of those checklists).

0%5%10%15%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: 10% of 10340 checklists6 am: 11% of 30951 checklists7 am: 7.9% of 64150 checklists8 am: 7.2% of 70252 checklists9 am: 8.4% of 55280 checklists10 am: 8.8% of 47111 checklists11 am: 8.5% of 37615 checklists12 pm: 7.9% of 32195 checklists1 pm: 8.2% of 30185 checklists2 pm: 8.9% of 29679 checklists3 pm: 9.3% of 26483 checklists4 pm: 9.7% of 20110 checklists5 pm: 11% of 15993 checklists6 pm: 9.5% 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
January0.5%0.3%0.1%0.1%
February0.1%0.1%0.1%0.2%
March0.1%0.2%1.6%5.4%
April8.6%9.0%9.0%9.0%
May8.7%7.5%8.7%9.9%
June9.3%8.8%8.4%8.7%
July8.9%11%14%18%
August19%20%21%22%
September22%20%19%17%
October16%13%11%9.2%
November7.1%5.7%4.0%2.5%
December2.3%1.8%0.9%0.7%

Neighboring states

  • New Hampshire: arrives the second week of March, 1 week earlier than Vermont
  • Massachusetts: arrives the second week of April, 3 weeks later than Vermont
  • Connecticut: arrives early May, 6 weeks later than Vermont
  • Rhode Island: arrives early July, 14 weeks later than Vermont

Common questions

When do Great Blue Herons arrive in Vermont?
Great Blue Herons reach Vermont in mid March, are common by late March, peak in late August (22% of checklists), and most are gone by the second week of November.
When do Great Blue Herons leave Vermont?
Most Great Blue Herons have left Vermont by the second week of November, when reports fall below half their usual rate. Stragglers are still reported until mid December.
When is the best time to see a Great Blue Heron in Vermont?
The Great Blue Heron is reported most often in late August, on about 22% of Vermont checklists.
Where in Vermont are Great Blue Herons seen most often?
By county, Franklin County, Grand Isle County, and Chittenden County have the highest peak reporting rates for the Great Blue Heron (counties with at least 200 checklists).