WhenToBird

Botaurus lentiginosus · Ardeidae

When Do American Bitterns Arrive in New Jersey?

Adult American Bittern
Photo: Kathy Richardson, CC BY 4.0 via iNaturalist

American Bitterns are winter birds in New Jersey: they arrive in early September, peak in mid October (1.0% of checklists), and most are gone by late December.

When to look

First arrivalsSep 1-7early September
Common bySep 1-7early September
PeakOct 15-21mid October
Most gone byDec 22-31late December

Best: mid October. First arrivals early September; most are gone by late December. Peak: on about 1.0% of New Jersey checklists.

  1. Janrare
  2. Febrare
  3. Maruncommon
  4. Aprcommon
  5. Maycommon
  6. Junrare
  7. Julrare
  8. Augrare
  9. Sepcommon
  10. Octpeak season
  11. Novpeak season
  12. Deccommon

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

0%0.5%1%1.5%Jan 1-7: 0.1% of 28167 checklistsJan 8-14: 0.2% of 20583 checklistsJan 15-21: 0.1% of 19739 checklistsJan 22-31: 0.1% of 24586 checklistsFeb 1-7: 0.1% of 17226 checklistsFeb 8-14: 0.1% of 19567 checklistsFeb 15-21: 0.1% of 26553 checklistsFeb 22-28: 0.2% of 19046 checklistsMar 1-7: 0.1% of 17969 checklistsMar 8-14: 0.1% of 18976 checklistsMar 15-21: 0.1% of 18581 checklistsMar 22-31: 0.3% of 27590 checklistsApr 1-7: 0.3% of 21202 checklistsApr 8-14: 0.4% of 23609 checklistsApr 15-21: 0.6% of 25056 checklistsApr 22-30: 0.6% of 36679 checklistsMay 1-7: 0.4% of 38378 checklistsMay 8-14: 0.3% of 44071 checklistsMay 15-21: 0.2% 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: 0.1% of 17187 checklistsJul 1-7: 0.1% of 13406 checklistsJul 8-14: 0.1% of 12550 checklistsJul 15-21: 0.1% of 12358 checklistsJul 22-31: 0.1% 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: 0.2% of 17984 checklistsSep 8-14: 0.5% of 18320 checklistsSep 15-21: 0.6% of 20491 checklistsSep 22-30: 0.7% of 26176 checklistsOct 1-7: 0.8% of 24112 checklistsOct 8-14: 1.0% of 24603 checklistsOct 15-21: 1.2% of 24549 checklistsOct 22-31: 1.0% of 26206 checklistsNov 1-7: 0.8% of 17469 checklistsNov 8-14: 0.7% of 15102 checklistsNov 15-21: 0.6% of 14958 checklistsNov 22-30: 0.5% of 19447 checklistsDec 1-7: 0.5% of 14017 checklistsDec 8-14: 0.3% of 14625 checklistsDec 15-21: 0.3% of 16937 checklistsDec 22-31: 0.1% 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. Atlantic CountyBest late November · 580 checklists that week, 28,208 in all4.9%
  2. Burlington CountyBest the second week of November · 804 checklists that week, 52,358 in all3.6%
  3. Cape May CountyBest late October · 7449 checklists that week, 189,832 in all2.4%
  4. Passaic CountyBest the second week of May · 1413 checklists that week, 24,933 in all2.2%
  5. Somerset CountyBest mid April · 1634 checklists that week, 58,057 in all1.5%
  6. Sussex CountyBest mid April · 811 checklists that week, 30,305 in all1.3%

Best spots

Share of checklists at the peak
  1. Burlington County FairgroundsBurlington County, best early November · 65 checklists that week, 1,739 in all56%
  2. River Road ParkSomerset County, best mid April · 59 checklists that week, 707 in all32%
  3. Lily LakeAtlantic County, best late November · 46 checklists that week, 2,057 in all25%
  4. Edwin B. Forsythe National Wildlife RefugeAtlantic County, best late November · 34 checklists that week, 1,233 in all21%
  5. Lily Lake (north)Atlantic County, best mid September · 26 checklists that week, 1,241 in all16%

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

Best time of day

In New Jersey, the American Bittern is most often listed on checklists started between 5 and 7 pm (0.5% of those checklists).

0%0.5%1%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: 0.3% of 50447 checklists7 am: 0.3% of 118312 checklists8 am: 0.4% of 123273 checklists9 am: 0.3% of 107783 checklists10 am: 0.3% of 97537 checklists11 am: 0.2% of 82427 checklists12 pm: 0.3% of 72581 checklists1 pm: 0.2% of 71478 checklists2 pm: 0.2% of 69994 checklists3 pm: 0.3% of 66822 checklists4 pm: 0.3% of 55950 checklists5 pm: 0.4% of 41360 checklists6 pm: 0.5% 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
January0.1%0.2%0.1%0.1%
February0.1%0.1%0.1%0.2%
March0.1%0.1%0.1%0.3%
April0.3%0.4%0.6%0.6%
May0.4%0.3%0.2%0.1%
June0.1%0.1%0.1%0.1%
July0.1%0.1%0.1%0.1%
August0.1%0.1%0.1%0.1%
September0.2%0.5%0.6%0.7%
October0.8%1.0%1.2%1.0%
November0.8%0.7%0.6%0.5%
December0.5%0.3%0.3%0.1%

Neighboring states

  • New York: arrives early April, 20 weeks earlier than New Jersey
  • District of Columbia: arrives mid September, 2 weeks later than New Jersey
  • New Hampshire: arrives mid April, 18 weeks earlier than New Jersey
  • Vermont: arrives mid April, 18 weeks earlier than New Jersey

Common questions

When do American Bitterns arrive in New Jersey?
American Bitterns are winter birds in New Jersey: they arrive in early September, peak in mid October (1.0% of checklists), and most are gone by late December.
When do American Bitterns leave New Jersey?
Most American Bitterns have left New Jersey by late December, when reports fall below half their usual rate.
When is the best time to see a American Bittern in New Jersey?
The American Bittern is reported most often in mid October, on about 1.0% of New Jersey checklists.
Where in New Jersey are American Bitterns seen most often?
By county, Atlantic County, Burlington County, and Cape May County have the highest peak reporting rates for the American Bittern (counties with at least 200 checklists).