WhenToBird

Butorides virescens · Ardeidae

When Do Green Herons Arrive in New Mexico?

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

Green Herons arrive in New Mexico in mid April, peak in early September (1.9% of checklists), and most are gone by late September.

When to look

First arrivalsApr 15-21mid April
Common byApr 15-21mid April
PeakSep 1-7early September
Most gone bySep 22-30late September

Best: early September. First arrivals mid April; most are gone by late September. Peak: on about 1.9% of New Mexico checklists.

  1. Janrare
  2. Febrare
  3. Marrare
  4. Aprcommon
  5. Maypeak season
  6. Juncommon
  7. Julpeak season
  8. Augpeak season
  9. Seppeak season
  10. Octuncommon
  11. Novrare
  12. Decrare

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

0%1%2%3%Jan 1-7: 0.1% of 11827 checklistsJan 8-14: 0.1% of 9370 checklistsJan 15-21: 0.1% of 9561 checklistsJan 22-31: 0.1% of 12707 checklistsFeb 1-7: 0.1% of 9365 checklistsFeb 8-14: 0.1% of 10141 checklistsFeb 15-21: 0.1% of 12431 checklistsFeb 22-28: 0.1% of 9159 checklistsMar 1-7: 0.1% of 9348 checklistsMar 8-14: 0.1% of 9704 checklistsMar 15-21: 0.1% of 9896 checklistsMar 22-31: 0.1% of 14679 checklistsApr 1-7: 0.2% of 11145 checklistsApr 8-14: 0.2% of 11939 checklistsApr 15-21: 0.8% of 12885 checklistsApr 22-30: 1.4% of 17935 checklistsMay 1-7: 1.6% of 15202 checklistsMay 8-14: 1.7% of 16604 checklistsMay 15-21: 1.8% of 12720 checklistsMay 22-31: 1.3% of 16699 checklistsJun 1-7: 1.2% of 9889 checklistsJun 8-14: 1.2% of 9322 checklistsJun 15-21: 1.2% of 8341 checklistsJun 22-30: 1.3% of 10562 checklistsJul 1-7: 1.0% of 9036 checklistsJul 8-14: 1.2% of 8461 checklistsJul 15-21: 1.4% of 8585 checklistsJul 22-31: 1.7% of 11800 checklistsAug 1-7: 1.5% of 8289 checklistsAug 8-14: 1.5% of 8882 checklistsAug 15-21: 1.5% of 9136 checklistsAug 22-31: 2.1% of 12662 checklistsSep 1-7: 1.6% of 9936 checklistsSep 8-14: 1.9% of 9581 checklistsSep 15-21: 1.5% of 9355 checklistsSep 22-30: 0.9% of 12402 checklistsOct 1-7: 0.7% of 9467 checklistsOct 8-14: 0.5% of 10279 checklistsOct 15-21: 0.3% of 8990 checklistsOct 22-31: 0.1% of 11986 checklistsNov 1-7: 0.1% of 8461 checklistsNov 8-14: 0.1% of 8801 checklistsNov 15-21: 0.1% of 8616 checklistsNov 22-30: 0.1% of 11088 checklistsDec 1-7: 0.1% of 8444 checklistsDec 8-14: 0.2% of 8575 checklistsDec 15-21: 0.1% of 10958 checklistsDec 22-31: 0.2% of 14523 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 New Mexico 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.

Embed this map on your site

Where in New Mexico

Best counties

Share of checklists at the peak
  1. De Baca CountyBest late July · 15 checklists that week, 2,203 in all19%
  2. Eddy CountyBest mid June · 112 checklists that week, 11,011 in all13%
  3. Chaves CountyBest late June · 67 checklists that week, 5,298 in all9.8%
  4. Socorro CountyBest early August · 297 checklists that week, 33,508 in all8.4%
  5. Sierra CountyBest the second week of May · 274 checklists that week, 13,458 in all6.8%
  6. Rio Arriba CountyBest early September · 121 checklists that week, 8,526 in all6.6%

Best spots

Share of checklists at the peak
  1. Bosque del Apache National Wildlife Refuge (east)Socorro County, best late May · 21 checklists that week, 586 in all42%
  2. La Llorona ParkDona Ana County, best early September · 24 checklists that week, 1,183 in all39%
  3. Montano Southwest Bosque (2)Bernalillo County, best early September · 21 checklists that week, 1,794 in all36%
  4. Mesilla Valley Bosque ParkDona Ana County, best mid August · 22 checklists that week, 1,607 in all34%

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

Best time of day

In New Mexico, the Green Heron is most often listed on checklists started between 6 and 8 am (1.3% of those checklists).

0%0.5%1%1.5%2%12 am: too few checklists (186) to judge1 am: too few checklists (180) to judge2 am: too few checklists (172) to judge3 am: too few checklists (183) to judge4 am: too few checklists (527) to judge5 am: too few checklists (4013) to judge6 am: 1.8% of 29677 checklists7 am: 1.1% of 71785 checklists8 am: 1.1% of 79208 checklists9 am: 0.6% of 61605 checklists10 am: 0.4% of 49588 checklists11 am: 0.4% of 38079 checklists12 pm: 0.4% of 31089 checklists1 pm: 0.5% of 27524 checklists2 pm: 0.5% of 26644 checklists3 pm: 0.4% of 26849 checklists4 pm: 0.5% of 25156 checklists5 pm: 0.6% of 19061 checklists6 pm: 0.6% of 15112 checklists7 pm: too few checklists (9040) to judge8 pm: too few checklists (2738) to judge9 pm: too few checklists (736) to judge10 pm: too few checklists (384) to judge11 pm: too few checklists (208) 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
January0.1%0.1%0.1%0.1%
February0.1%0.1%0.1%0.1%
March0.1%0.1%0.1%0.1%
April0.2%0.2%0.8%1.4%
May1.6%1.7%1.8%1.3%
June1.2%1.2%1.2%1.3%
July1.0%1.2%1.4%1.7%
August1.5%1.5%1.5%2.1%
September1.6%1.9%1.5%0.9%
October0.7%0.5%0.3%0.1%
November0.1%0.1%0.1%0.1%
December0.1%0.2%0.1%0.2%

Neighboring states

  • Arizona: year-round, peaks late September
  • Oklahoma: arrives mid April, in the same week than New Mexico
  • Texas: arrives late March, 3 weeks earlier than New Mexico
  • Kansas: arrives mid April, in the same week than New Mexico

Common questions

When do Green Herons arrive in New Mexico?
Green Herons arrive in New Mexico in mid April, peak in early September (1.9% of checklists), and most are gone by late September.
When do Green Herons leave New Mexico?
Most Green Herons have left New Mexico by late September, when reports fall below half their usual rate.
When is the best time to see a Green Heron in New Mexico?
The Green Heron is reported most often in early September, on about 1.9% of New Mexico checklists.
Where in New Mexico are Green Herons seen most often?
By county, De Baca County, Eddy County, and Chaves County have the highest peak reporting rates for the Green Heron (counties with at least 200 checklists).