WhenToBird

Junco hyemalis · Passerellidae

When Do Dark-eyed Juncos Arrive in New Jersey?

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

Dark-eyed Juncos are winter birds in New Jersey: the first arrive in early October, they are common by late October, peak in the second week of December (44% of checklists), and most are gone by the second week of April.

When to look

First arrivalsOct 1-7early October
Common byOct 22-31late October
PeakDec 8-14the second week of December
Most gone byApr 8-14the second week of April

Best: the second week of December. First arrivals early October; most are gone by the second week of April. Peak: on about 44% of New Jersey checklists.

  1. Janpeak season
  2. Febpeak season
  3. Marpeak season
  4. Aprpeak season
  5. Maynot usually seen
  6. Junnot usually seen
  7. Julnot usually seen
  8. Augnot usually seen
  9. Sepnot usually seen
  10. Octcommon
  11. Novpeak season
  12. Decpeak season

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

0%20%40%60%Jan 1-7: 33% of 28167 checklistsJan 8-14: 34% of 20583 checklistsJan 15-21: 36% of 19739 checklistsJan 22-31: 36% of 24586 checklistsFeb 1-7: 35% of 17226 checklistsFeb 8-14: 40% of 19567 checklistsFeb 15-21: 41% of 26553 checklistsFeb 22-28: 33% of 19046 checklistsMar 1-7: 35% of 17969 checklistsMar 8-14: 36% of 18976 checklistsMar 15-21: 37% of 18581 checklistsMar 22-31: 39% of 27590 checklistsApr 1-7: 38% of 21202 checklistsApr 8-14: 27% of 23609 checklistsApr 15-21: 13% of 25056 checklistsApr 22-30: 2.8% of 36679 checklistsMay 1-7: 0.5% of 38378 checklistsMay 8-14: 0.2% of 44071 checklistsMay 15-21: 0.1% of 34076 checklistsMay 22-31: 0.1% of 32558 checklistsJun 1-7: 0.1% of 18049 checklistsJun 8-14: 0.1% of 15597 checklistsJun 15-21: 0.1% of 14894 checklistsJun 22-30: 0% of 17187 checklistsJul 1-7: 0% of 13406 checklistsJul 8-14: 0% of 12550 checklistsJul 15-21: 0.1% of 12358 checklistsJul 22-31: 0% of 18382 checklistsAug 1-7: 0.1% of 13689 checklistsAug 8-14: 0.1% of 14006 checklistsAug 15-21: 0.1% of 14483 checklistsAug 22-31: 0.1% of 23182 checklistsSep 1-7: 0.1% of 17984 checklistsSep 8-14: 0.1% of 18320 checklistsSep 15-21: 0.3% of 20491 checklistsSep 22-30: 1.0% of 26176 checklistsOct 1-7: 3.8% of 24112 checklistsOct 8-14: 9.1% of 24603 checklistsOct 15-21: 16% of 24549 checklistsOct 22-31: 26% of 26206 checklistsNov 1-7: 37% of 17469 checklistsNov 8-14: 41% of 15102 checklistsNov 15-21: 43% of 14958 checklistsNov 22-30: 43% of 19447 checklistsDec 1-7: 43% of 14017 checklistsDec 8-14: 43% of 14625 checklistsDec 15-21: 45% of 16937 checklistsDec 22-31: 38% of 26651 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 Jersey 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 Jersey

Best counties

Share of checklists at the peak
  1. Somerset CountyBest the second week of December · 841 checklists that week, 58,057 in all63%
  2. Passaic CountyBest the second week of November · 349 checklists that week, 24,933 in all63%
  3. Camden CountyBest the second week of December · 337 checklists that week, 25,931 in all60%
  4. Essex CountyBest mid December · 479 checklists that week, 28,396 in all59%
  5. Union CountyBest the second week of December · 278 checklists that week, 23,647 in all59%
  6. Hunterdon CountyBest the second week of December · 988 checklists that week, 57,610 in all59%

Best spots

Share of checklists at the peak
  1. Plainsboro PreserveMiddlesex County, best late January · 24 checklists that week, 1,146 in all95%
  2. Ingersoll Reservoir (northeast)Warren County, best the second week of March · 50 checklists that week, 586 in all94%
  3. Hariton SanctuaryWarren County, best early November · 22 checklists that week, 411 in all93%
  4. Chestnut Branch ParkGloucester County, best late November · 22 checklists that week, 150 in all92%

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

Best time of day

In New Jersey, the Dark-eyed Junco is most often listed on checklists started between 7 and 9 am (24% of those checklists).

0%10%20%30%12 am: too few checklists (746) to judge1 am: too few checklists (640) to judge2 am: too few checklists (606) to judge3 am: too few checklists (755) to judge4 am: too few checklists (1681) to judge5 am: too few checklists (11258) to judge6 am: 15% of 50447 checklists7 am: 24% of 118312 checklists8 am: 23% of 123273 checklists9 am: 21% of 107783 checklists10 am: 19% of 97537 checklists11 am: 19% of 82427 checklists12 pm: 18% of 72581 checklists1 pm: 18% of 71478 checklists2 pm: 18% of 69994 checklists3 pm: 17% of 66822 checklists4 pm: 12% of 55950 checklists5 pm: 7.4% of 41360 checklists6 pm: 4.0% of 28122 checklists7 pm: too few checklists (14727) to judge8 pm: too few checklists (4257) to judge9 pm: too few checklists (1273) to judge10 pm: too few checklists (920) to judge11 pm: too few checklists (693) 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
January33%34%36%36%
February35%40%41%33%
March35%36%37%39%
April38%27%13%2.8%
May0.5%0.2%0.1%0.1%
June0.1%0.1%0.1%0%
July0%0%0.1%0%
August0.1%0.1%0.1%0.1%
September0.1%0.1%0.3%1.0%
October3.8%9.1%16%26%
November37%41%43%43%
December43%43%45%38%

Neighboring states

  • Delaware: arrives the second week of October, 1 week later than New Jersey
  • Connecticut: arrives late September, 1 week earlier than New Jersey
  • Pennsylvania: arrives early October, in the same week than New Jersey
  • New York: arrives mid October, 2 weeks later than New Jersey

Common questions

When do Dark-eyed Juncos arrive in New Jersey?
Dark-eyed Juncos are winter birds in New Jersey: the first arrive in early October, they are common by late October, peak in the second week of December (44% of checklists), and most are gone by the second week of April.
When do Dark-eyed Juncos leave New Jersey?
Most Dark-eyed Juncos have left New Jersey by the second week of April, when reports fall below half their usual rate. Stragglers are still reported until late April.
When is the best time to see a Dark-eyed Junco in New Jersey?
The Dark-eyed Junco is reported most often in the second week of December, on about 44% of New Jersey checklists.
Where in New Jersey are Dark-eyed Juncos seen most often?
By county, Somerset County, Passaic County, and Camden County have the highest peak reporting rates for the Dark-eyed Junco (counties with at least 200 checklists).