WhenToBird

Ardea herodias · Ardeidae

When Do Great Blue Herons Arrive in New Mexico?

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

The Great Blue Heron is in New Mexico all year. It turns up on about 10% of checklists at its peak (mid November) and on 3.4% in its quietest week (the second week of June).

When to look

PresentAll year
Peak weekNov 15-21mid November
Quietest weekJun 8-14the second week of June

Best: mid November. Here all year. Peak: on about 10% of New Mexico checklists.

  1. Janpeak season
  2. Febcommon
  3. Marpeak season
  4. Aprcommon
  5. Maycommon
  6. Jununcommon
  7. Julcommon
  8. Augpeak season
  9. Seppeak season
  10. Octpeak season
  11. Novpeak season
  12. Decpeak season

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

0%5%10%15%Jan 1-7: 9.0% of 11827 checklistsJan 8-14: 9.3% of 9370 checklistsJan 15-21: 9.1% of 9561 checklistsJan 22-31: 8.3% of 12707 checklistsFeb 1-7: 7.6% of 9365 checklistsFeb 8-14: 6.8% of 10141 checklistsFeb 15-21: 6.7% of 12431 checklistsFeb 22-28: 8.0% of 9159 checklistsMar 1-7: 7.4% of 9348 checklistsMar 8-14: 7.4% of 9704 checklistsMar 15-21: 8.0% of 9896 checklistsMar 22-31: 7.9% of 14679 checklistsApr 1-7: 7.7% of 11145 checklistsApr 8-14: 6.3% of 11939 checklistsApr 15-21: 5.9% of 12885 checklistsApr 22-30: 5.7% of 17935 checklistsMay 1-7: 4.8% of 15202 checklistsMay 8-14: 4.4% of 16604 checklistsMay 15-21: 4.5% of 12720 checklistsMay 22-31: 3.9% of 16699 checklistsJun 1-7: 3.3% of 9889 checklistsJun 8-14: 3.7% of 9322 checklistsJun 15-21: 3.3% of 8341 checklistsJun 22-30: 3.9% of 10562 checklistsJul 1-7: 3.8% of 9036 checklistsJul 8-14: 4.5% of 8461 checklistsJul 15-21: 5.6% of 8585 checklistsJul 22-31: 6.7% of 11800 checklistsAug 1-7: 6.7% of 8289 checklistsAug 8-14: 7.3% of 8882 checklistsAug 15-21: 8.1% of 9136 checklistsAug 22-31: 9.1% of 12662 checklistsSep 1-7: 9.4% of 9936 checklistsSep 8-14: 10% of 9581 checklistsSep 15-21: 10% of 9355 checklistsSep 22-30: 9.7% of 12402 checklistsOct 1-7: 10% of 9467 checklistsOct 8-14: 9.7% of 10279 checklistsOct 15-21: 9.4% of 8990 checklistsOct 22-31: 9.5% of 11986 checklistsNov 1-7: 9.8% of 8461 checklistsNov 8-14: 11% of 8801 checklistsNov 15-21: 10% of 8616 checklistsNov 22-30: 11% of 11088 checklistsDec 1-7: 10% of 8444 checklistsDec 8-14: 10% of 8575 checklistsDec 15-21: 8.8% of 10958 checklistsDec 22-31: 8.9% 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.

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Where in New Mexico

Best counties

Share of checklists at the peak
  1. De Baca CountyBest early February · 14 checklists that week, 2,203 in all44%
  2. Sierra CountyBest mid September · 173 checklists that week, 13,458 in all43%
  3. Colfax CountyBest the second week of October · 277 checklists that week, 8,053 in all38%
  4. Quay CountyBest mid September · 44 checklists that week, 2,220 in all35%
  5. Harding CountyBest late November · 12 checklists that week, 932 in all35%
  6. Curry CountyBest mid September · 110 checklists that week, 2,926 in all29%

Best spots

Share of checklists at the peak
  1. Lake AvalonEddy County, best late August · 20 checklists that week, 464 in all93%
  2. Quemado LakeCatron County, best mid May · 24 checklists that week, 527 in all89%
  3. Isleta LakesBernalillo County, best the second week of February · 23 checklists that week, 693 in all83%
  4. Storrie Lake State ParkSan Miguel County, best mid September · 35 checklists that week, 505 in all82%

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

Best time of day

In New Mexico, the Great Blue Heron is most often listed on checklists started between 8 and 10 am (8.4% of those checklists).

0%5%10%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: 7.3% of 29677 checklists7 am: 7.6% of 71785 checklists8 am: 8.8% of 79208 checklists9 am: 7.9% of 61605 checklists10 am: 7.3% of 49588 checklists11 am: 7.0% of 38079 checklists12 pm: 7.1% of 31089 checklists1 pm: 7.6% of 27524 checklists2 pm: 7.5% of 26644 checklists3 pm: 7.3% of 26849 checklists4 pm: 7.1% of 25156 checklists5 pm: 6.3% of 19061 checklists6 pm: 5.4% 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
January9.0%9.3%9.1%8.3%
February7.6%6.8%6.7%8.0%
March7.4%7.4%8.0%7.9%
April7.7%6.3%5.9%5.7%
May4.8%4.4%4.5%3.9%
June3.3%3.7%3.3%3.9%
July3.8%4.5%5.6%6.7%
August6.7%7.3%8.1%9.1%
September9.4%10%10%9.7%
October10%9.7%9.4%9.5%
November9.8%11%10%11%
December10%10%8.8%8.9%

Neighboring states

  • Arizona: year-round, peaks late November
  • Colorado: all year, most in spring, peaks late April
  • Utah: year-round, peaks early September
  • Oklahoma: year-round, peaks late September

Common questions

When do Great Blue Herons arrive in New Mexico?
The Great Blue Heron is in New Mexico all year. It turns up on about 10% of checklists at its peak (mid November) and on 3.4% in its quietest week (the second week of June).
When do Great Blue Herons leave New Mexico?
The Great Blue Heron does not leave New Mexico: it is reported all year, from 3.4% of checklists in the second week of June to 10% in mid November.
When is the best time to see a Great Blue Heron in New Mexico?
The Great Blue Heron is reported most often in mid November, on about 10% of New Mexico checklists.
Where in New Mexico are Great Blue Herons seen most often?
By county, De Baca County, Sierra County, and Colfax County have the highest peak reporting rates for the Great Blue Heron (counties with at least 200 checklists).