WhenToBird

Sialia sialis · Turdidae

When Do Eastern Bluebirds Arrive in New Jersey?

Adult male Eastern Bluebird
Photo: Dan Vickers, CC BY 4.0 via iNaturalist

The Eastern Bluebird is in New Jersey all year. It turns up on about 17% of checklists at its peak (the second week of November) and on 7.1% in its quietest week (the second week of September).

When to look

PresentAll year
Peak weekNov 8-14the second week of November
Quietest weekSep 8-14the second week of September

Best: the second week of November. Here all year. Peak: on about 17% of New Jersey checklists.

  1. Jancommon
  2. Febcommon
  3. Marpeak season
  4. Aprpeak season
  5. Maycommon
  6. Junpeak season
  7. Julcommon
  8. Augcommon
  9. Sepcommon
  10. Octpeak season
  11. Novpeak season
  12. Deccommon

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

0%5%10%15%20%Jan 1-7: 7.8% of 28167 checklistsJan 8-14: 7.8% of 20583 checklistsJan 15-21: 7.3% of 19739 checklistsJan 22-31: 8.0% of 24586 checklistsFeb 1-7: 8.5% of 17226 checklistsFeb 8-14: 8.0% of 19567 checklistsFeb 15-21: 8.2% of 26553 checklistsFeb 22-28: 11% of 19046 checklistsMar 1-7: 11% of 17969 checklistsMar 8-14: 14% of 18976 checklistsMar 15-21: 15% of 18581 checklistsMar 22-31: 14% of 27590 checklistsApr 1-7: 14% of 21202 checklistsApr 8-14: 14% of 23609 checklistsApr 15-21: 13% of 25056 checklistsApr 22-30: 13% of 36679 checklistsMay 1-7: 11% of 38378 checklistsMay 8-14: 10% of 44071 checklistsMay 15-21: 10% of 34076 checklistsMay 22-31: 12% of 32558 checklistsJun 1-7: 12% of 18049 checklistsJun 8-14: 13% of 15597 checklistsJun 15-21: 13% of 14894 checklistsJun 22-30: 13% of 17187 checklistsJul 1-7: 13% of 13406 checklistsJul 8-14: 12% of 12550 checklistsJul 15-21: 10% of 12358 checklistsJul 22-31: 9.2% of 18382 checklistsAug 1-7: 8.3% of 13689 checklistsAug 8-14: 8.0% of 14006 checklistsAug 15-21: 7.7% of 14483 checklistsAug 22-31: 7.9% of 23182 checklistsSep 1-7: 6.9% of 17984 checklistsSep 8-14: 7.2% of 18320 checklistsSep 15-21: 7.2% of 20491 checklistsSep 22-30: 7.4% of 26176 checklistsOct 1-7: 8.2% of 24112 checklistsOct 8-14: 8.4% of 24603 checklistsOct 15-21: 10% of 24549 checklistsOct 22-31: 14% of 26206 checklistsNov 1-7: 18% of 17469 checklistsNov 8-14: 17% of 15102 checklistsNov 15-21: 16% of 14958 checklistsNov 22-30: 14% of 19447 checklistsDec 1-7: 12% of 14017 checklistsDec 8-14: 11% of 14625 checklistsDec 15-21: 12% of 16937 checklistsDec 22-31: 8.9% 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. Hunterdon CountyBest early November · 1055 checklists that week, 57,610 in all42%
  2. Warren CountyBest late October · 461 checklists that week, 20,077 in all36%
  3. Somerset CountyBest mid April · 1634 checklists that week, 58,057 in all33%
  4. Mercer CountyBest late June · 1006 checklists that week, 56,614 in all28%
  5. Sussex CountyBest late October · 620 checklists that week, 30,305 in all26%
  6. Morris CountyBest mid April · 1769 checklists that week, 59,212 in all26%

Best spots

Share of checklists at the peak
  1. Fairview Farm Wildlife PreserveSomerset County, best early May · 40 checklists that week, 1,451 in all93%
  2. South Branch PreserveMorris County, best early April · 22 checklists that week, 724 in all90%
  3. Cloverdale Road FarmOcean County, best mid September · 29 checklists that week, 1,924 in all88%
  4. Delaware Water Gap National Recreation AreaSussex County, best late October · 23 checklists that week, 316 in all84%
  5. YoungstownMorris County, best the second week of July · 24 checklists that week, 1,118 in all79%

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

Best time of day

In New Jersey, the Eastern Bluebird is most often listed on checklists started between 6 and 8 am (16% of those checklists).

0%5%10%15%20%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: 16% of 118312 checklists8 am: 14% of 123273 checklists9 am: 12% of 107783 checklists10 am: 10% of 97537 checklists11 am: 8.9% of 82427 checklists12 pm: 7.8% of 72581 checklists1 pm: 7.9% of 71478 checklists2 pm: 8.2% of 69994 checklists3 pm: 7.6% of 66822 checklists4 pm: 7.5% of 55950 checklists5 pm: 7.8% of 41360 checklists6 pm: 7.9% 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
January7.8%7.8%7.3%8.0%
February8.5%8.0%8.2%11%
March11%14%15%14%
April14%14%13%13%
May11%10%10%12%
June12%13%13%13%
July13%12%10%9.2%
August8.3%8.0%7.7%7.9%
September6.9%7.2%7.2%7.4%
October8.2%8.4%10%14%
November18%17%16%14%
December12%11%12%8.9%

Neighboring states

Common questions

When do Eastern Bluebirds arrive in New Jersey?
The Eastern Bluebird is in New Jersey all year. It turns up on about 17% of checklists at its peak (the second week of November) and on 7.1% in its quietest week (the second week of September).
When do Eastern Bluebirds leave New Jersey?
The Eastern Bluebird does not leave New Jersey: it is reported all year, from 7.1% of checklists in the second week of September to 17% in the second week of November.
When is the best time to see a Eastern Bluebird in New Jersey?
The Eastern Bluebird is reported most often in the second week of November, on about 17% of New Jersey checklists.
Where in New Jersey are Eastern Bluebirds seen most often?
By county, Hunterdon County, Warren County, and Somerset County have the highest peak reporting rates for the Eastern Bluebird (counties with at least 200 checklists).