WhenToBird

Butorides virescens · Ardeidae

When Do Green Herons Arrive in Minnesota?

Adult male Green Heron
Photo: Jonathan Eisen, CC BY 4.0 via iNaturalist

Green Herons reach Minnesota in late April, are common by the second week of May, peak in the second week of August (14% of checklists), and most are gone by mid September.

When to look

First arrivalsApr 22-30late April
Common byMay 8-14the second week of May
PeakAug 8-14the second week of August
Most gone bySep 15-21mid September

Best: the second week of August. First arrivals late April; most are gone by mid September. Peak: on about 14% of Minnesota checklists.

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

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

0%5%10%15%Jan 1-7: 0% of 20628 checklistsJan 8-14: 0% of 14594 checklistsJan 15-21: 0% of 14238 checklistsJan 22-31: 0% of 20725 checklistsFeb 1-7: 0% of 14484 checklistsFeb 8-14: 0% of 15988 checklistsFeb 15-21: 0% of 20718 checklistsFeb 22-28: 0% of 15754 checklistsMar 1-7: 0% of 16125 checklistsMar 8-14: 0% of 19035 checklistsMar 15-21: 0% of 19586 checklistsMar 22-31: 0% of 30192 checklistsApr 1-7: 0% of 24262 checklistsApr 8-14: 0.1% of 30223 checklistsApr 15-21: 0.1% of 29085 checklistsApr 22-30: 1.6% of 43574 checklistsMay 1-7: 5.0% of 39300 checklistsMay 8-14: 7.1% of 45927 checklistsMay 15-21: 6.7% of 36632 checklistsMay 22-31: 6.9% of 43809 checklistsJun 1-7: 7.3% of 23418 checklistsJun 8-14: 7.5% of 20450 checklistsJun 15-21: 8.6% of 19470 checklistsJun 22-30: 9.4% of 23418 checklistsJul 1-7: 10% of 19104 checklistsJul 8-14: 11% of 16927 checklistsJul 15-21: 12% of 15635 checklistsJul 22-31: 13% of 22073 checklistsAug 1-7: 14% of 16255 checklistsAug 8-14: 14% of 16840 checklistsAug 15-21: 14% of 17475 checklistsAug 22-31: 13% of 26545 checklistsSep 1-7: 12% of 20750 checklistsSep 8-14: 11% of 18494 checklistsSep 15-21: 7.8% of 18215 checklistsSep 22-30: 4.0% of 24463 checklistsOct 1-7: 1.9% of 18252 checklistsOct 8-14: 0.5% of 19527 checklistsOct 15-21: 0.2% of 17098 checklistsOct 22-31: 0.1% of 24570 checklistsNov 1-7: 0.2% of 16744 checklistsNov 8-14: 0.1% of 13483 checklistsNov 15-21: 0.1% of 12525 checklistsNov 22-30: 0.1% of 17023 checklistsDec 1-7: 0% of 11645 checklistsDec 8-14: 0% of 11567 checklistsDec 15-21: 0% of 13343 checklistsDec 22-31: 0% of 19759 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 Minnesota 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 Minnesota

Best counties

Share of checklists at the peak
  1. Ramsey CountyBest the second week of August · 1206 checklists that week, 83,239 in all26%
  2. Hennepin CountyBest the second week of August · 3236 checklists that week, 223,149 in all25%
  3. Scott CountyBest early August · 352 checklists that week, 23,226 in all25%
  4. Isanti CountyBest early August · 30 checklists that week, 2,785 in all23%
  5. Anoka CountyBest the second week of August · 461 checklists that week, 28,326 in all20%
  6. McLeod CountyBest the second week of September · 64 checklists that week, 3,198 in all20%

Best spots

Share of checklists at the peak
  1. Maplewood Nature CenterRamsey County, best late August · 53 checklists that week, 1,664 in all95%
  2. Central ParkRamsey County, best the second week of August · 22 checklists that week, 1,108 in all86%
  3. Vadnais-Snail Lakes Regional Park - Snail LakeRamsey County, best early August · 63 checklists that week, 1,591 in all86%
  4. Lake CamelotHennepin County, best mid August · 28 checklists that week, 1,249 in all85%
  5. Purgatory Creek ParkHennepin County, best mid July · 90 checklists that week, 3,042 in all82%

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

Best time of day

In Minnesota, the Green Heron is most often listed on checklists started between 6 and 8 am (7.4% of those checklists).

0%5%10%12 am: too few checklists (349) to judge1 am: too few checklists (331) to judge2 am: too few checklists (286) to judge3 am: too few checklists (364) to judge4 am: too few checklists (863) to judge5 am: too few checklists (7598) to judge6 am: 9.4% of 35775 checklists7 am: 6.7% of 90565 checklists8 am: 5.6% of 110612 checklists9 am: 4.4% of 106128 checklists10 am: 3.6% of 96131 checklists11 am: 3.1% of 83750 checklists12 pm: 2.6% of 76254 checklists1 pm: 2.6% of 73480 checklists2 pm: 2.7% of 73703 checklists3 pm: 2.7% of 75249 checklists4 pm: 3.4% of 68810 checklists5 pm: 4.8% of 51899 checklists6 pm: 6.5% of 38524 checklists7 pm: 7.8% of 25120 checklists8 pm: too few checklists (10568) to judge9 pm: too few checklists (2420) to judge10 pm: too few checklists (748) to judge11 pm: too few checklists (420) 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%1.6%
May5.0%7.1%6.7%6.9%
June7.3%7.5%8.6%9.4%
July10%11%12%13%
August14%14%14%13%
September12%11%7.8%4.0%
October1.9%0.5%0.2%0.1%
November0.2%0.1%0.1%0.1%
December0%0%0%0%

Neighboring states

  • Iowa: arrives late April, in the same week than Minnesota
  • Wisconsin: arrives mid April, 1 week earlier than Minnesota
  • South Dakota: arrives early May, 1 week later than Minnesota
  • North Dakota: arrives late June, 8 weeks later than Minnesota

Common questions

When do Green Herons arrive in Minnesota?
Green Herons reach Minnesota in late April, are common by the second week of May, peak in the second week of August (14% of checklists), and most are gone by mid September.
When do Green Herons leave Minnesota?
Most Green Herons have left Minnesota by mid September, when reports fall below half their usual rate. Stragglers are still reported until early October.
When is the best time to see a Green Heron in Minnesota?
The Green Heron is reported most often in the second week of August, on about 14% of Minnesota checklists.
Where in Minnesota are Green Herons seen most often?
By county, Ramsey County, Hennepin County, and Scott County have the highest peak reporting rates for the Green Heron (counties with at least 200 checklists).