WhenToBird

Junco hyemalis · Passerellidae

When Do Dark-eyed Juncos Arrive in New Mexico?

Adult male Dark-eyed Junco
Photo: Jimmy Dee, CC BY-SA 4.0 via iNaturalist

Dark-eyed Juncos are in New Mexico all year, but most are here in winter: numbers build from the second week of October, peak in late December (50% of checklists), and fall back by late March. In the quietest week (mid May) they are still on about 6.1% of checklists.

When to look

Numbers buildOct 8-14the second week of October
PeakDec 22-31late December
Fall back byMar 22-31late March
FewestMay 15-21mid May

Best: late December. Here all year; numbers build from the second week of October and fall back by late March. Peak: on about 50% of New Mexico checklists.

  1. Janpeak season
  2. Febpeak season
  3. Marpeak season
  4. Aprcommon
  5. Mayuncommon
  6. Jununcommon
  7. Juluncommon
  8. Augrare
  9. Sepuncommon
  10. Octpeak season
  11. Novpeak season
  12. Decpeak season

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

0%20%40%60%Jan 1-7: 50% of 11827 checklistsJan 8-14: 48% of 9370 checklistsJan 15-21: 46% of 9561 checklistsJan 22-31: 45% of 12707 checklistsFeb 1-7: 44% of 9365 checklistsFeb 8-14: 48% of 10141 checklistsFeb 15-21: 50% of 12431 checklistsFeb 22-28: 46% of 9159 checklistsMar 1-7: 47% of 9348 checklistsMar 8-14: 43% of 9704 checklistsMar 15-21: 39% of 9896 checklistsMar 22-31: 34% of 14679 checklistsApr 1-7: 27% of 11145 checklistsApr 8-14: 21% of 11939 checklistsApr 15-21: 15% of 12885 checklistsApr 22-30: 11% of 17935 checklistsMay 1-7: 8.3% of 15202 checklistsMay 8-14: 6.1% of 16604 checklistsMay 15-21: 6.2% of 12720 checklistsMay 22-31: 6.1% of 16699 checklistsJun 1-7: 6.4% of 9889 checklistsJun 8-14: 7.3% of 9322 checklistsJun 15-21: 8.3% of 8341 checklistsJun 22-30: 8.4% of 10562 checklistsJul 1-7: 9.8% of 9036 checklistsJul 8-14: 8.7% of 8461 checklistsJul 15-21: 8.5% of 8585 checklistsJul 22-31: 7.1% of 11800 checklistsAug 1-7: 6.2% of 8289 checklistsAug 8-14: 6.4% of 8882 checklistsAug 15-21: 6.8% of 9136 checklistsAug 22-31: 6.6% of 12662 checklistsSep 1-7: 6.8% of 9936 checklistsSep 8-14: 6.5% of 9581 checklistsSep 15-21: 7.2% of 9355 checklistsSep 22-30: 11% of 12402 checklistsOct 1-7: 18% of 9467 checklistsOct 8-14: 28% of 10279 checklistsOct 15-21: 41% of 8990 checklistsOct 22-31: 47% of 11986 checklistsNov 1-7: 49% of 8461 checklistsNov 8-14: 48% of 8801 checklistsNov 15-21: 47% of 8616 checklistsNov 22-30: 47% of 11088 checklistsDec 1-7: 48% of 8444 checklistsDec 8-14: 49% of 8575 checklistsDec 15-21: 51% of 10958 checklistsDec 22-31: 50% 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. Cibola CountyBest late February · 56 checklists that week, 3,986 in all85%
  2. Los Alamos CountyBest the second week of November · 842 checklists that week, 50,554 in all82%
  3. Catron CountyBest the second week of January · 58 checklists that week, 6,114 in all79%
  4. Santa Fe CountyBest the second week of December · 1063 checklists that week, 66,241 in all70%
  5. Grant CountyBest the second week of November · 224 checklists that week, 16,662 in all68%
  6. Lincoln CountyBest the second week of February · 39 checklists that week, 4,676 in all66%

Best spots

Share of checklists at the peak
  1. Ranch School TrailLos Alamos County, best early March · 27 checklists that week, 1,691 in all98%
  2. Randall Davey Audubon PreserveSanta Fe County, best mid February · 53 checklists that week, 4,827 in all98%
  3. ParkLos Alamos County, best early December · 35 checklists that week, 2,834 in all98%
  4. Los AlamosLos Alamos County, best late November · 29 checklists that week, 1,430 in all98%
  5. Sandia CrestBernalillo County, best the second week of March · 105 checklists that week, 2,797 in all96%
  6. Los Alamos National Laboratory (Kwage Mesa)Los Alamos County, best early January · 23 checklists that week, 501 in all95%

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

Best time of day

In New Mexico, the Dark-eyed Junco is most often listed on checklists started between 8 and 10 am (32% of those checklists).

0%10%20%30%40%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: 16% of 29677 checklists7 am: 31% of 71785 checklists8 am: 33% of 79208 checklists9 am: 31% of 61605 checklists10 am: 28% of 49588 checklists11 am: 26% of 38079 checklists12 pm: 25% of 31089 checklists1 pm: 26% of 27524 checklists2 pm: 27% of 26644 checklists3 pm: 26% of 26849 checklists4 pm: 22% of 25156 checklists5 pm: 14% of 19061 checklists6 pm: 8.2% 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
January50%48%46%45%
February44%48%50%46%
March47%43%39%34%
April27%21%15%11%
May8.3%6.1%6.2%6.1%
June6.4%7.3%8.3%8.4%
July9.8%8.7%8.5%7.1%
August6.2%6.4%6.8%6.6%
September6.8%6.5%7.2%11%
October18%28%41%47%
November49%48%47%47%
December48%49%51%50%

Neighboring states

  • Arizona: arrives the second week of October, in the same week than New Mexico
  • Colorado: arrives the second week of October, in the same week than New Mexico
  • Utah: arrives the second week of October, in the same week than New Mexico
  • Oklahoma: arrives the second week of October, in the same week than New Mexico

Common questions

When do Dark-eyed Juncos arrive in New Mexico?
Dark-eyed Juncos are in New Mexico all year, but most are here in winter: numbers build from the second week of October, peak in late December (50% of checklists), and fall back by late March. In the quietest week (mid May) they are still on about 6.1% of checklists.
When do Dark-eyed Juncos leave New Mexico?
Dark-eyed Juncos never fully leave New Mexico: numbers fall back below half their usual rate by late March, but some are still reported in every week, about 6.1% of checklists at the low.
When is the best time to see a Dark-eyed Junco in New Mexico?
The Dark-eyed Junco is reported most often in late December, on about 50% of New Mexico checklists.
Where in New Mexico are Dark-eyed Juncos seen most often?
By county, Cibola County, Los Alamos County, and Catron County have the highest peak reporting rates for the Dark-eyed Junco (counties with at least 200 checklists).