WhenToBird

Cistothorus palustris · Troglodytidae

When Do Marsh Wrens Arrive in New Jersey?

Adult Marsh Wren
Photo: Kathy Richardson, CC BY 4.0 via iNaturalist

Marsh Wrens reach New Jersey in mid April, are common by early May, peak in mid July (8.1% of checklists), and most are gone by mid August.

When to look

First arrivalsApr 15-21mid April
Common byMay 1-7early May
PeakJul 15-21mid July
Most gone byAug 15-21mid August

Best: mid July. First arrivals mid April; most are gone by mid August. Peak: on about 8.1% of New Jersey checklists.

  1. Janrare
  2. Febnot usually seen
  3. Marrare
  4. Apruncommon
  5. Maypeak season
  6. Junpeak season
  7. Julpeak season
  8. Augpeak season
  9. Sepuncommon
  10. Octuncommon
  11. Novrare
  12. Decrare

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

0%5%10%Jan 1-7: 0.4% of 28167 checklistsJan 8-14: 0.3% of 20583 checklistsJan 15-21: 0.3% of 19739 checklistsJan 22-31: 0.2% of 24586 checklistsFeb 1-7: 0.2% of 17226 checklistsFeb 8-14: 0.2% 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: 0.2% of 18976 checklistsMar 15-21: 0.3% of 18581 checklistsMar 22-31: 0.3% of 27590 checklistsApr 1-7: 0.3% of 21202 checklistsApr 8-14: 0.6% of 23609 checklistsApr 15-21: 1.1% of 25056 checklistsApr 22-30: 2.8% of 36679 checklistsMay 1-7: 4.2% of 38378 checklistsMay 8-14: 6.0% of 44071 checklistsMay 15-21: 6.6% of 34076 checklistsMay 22-31: 8.0% of 32558 checklistsJun 1-7: 6.9% of 18049 checklistsJun 8-14: 6.6% of 15597 checklistsJun 15-21: 6.4% of 14894 checklistsJun 22-30: 6.6% of 17187 checklistsJul 1-7: 7.0% of 13406 checklistsJul 8-14: 7.6% of 12550 checklistsJul 15-21: 8.3% of 12358 checklistsJul 22-31: 8.4% of 18382 checklistsAug 1-7: 6.4% of 13689 checklistsAug 8-14: 4.5% of 14006 checklistsAug 15-21: 3.4% of 14483 checklistsAug 22-31: 2.8% of 23182 checklistsSep 1-7: 3.0% of 17984 checklistsSep 8-14: 2.8% of 18320 checklistsSep 15-21: 2.5% of 20491 checklistsSep 22-30: 2.2% of 26176 checklistsOct 1-7: 2.1% of 24112 checklistsOct 8-14: 1.7% of 24603 checklistsOct 15-21: 1.4% of 24549 checklistsOct 22-31: 1.0% of 26206 checklistsNov 1-7: 0.9% of 17469 checklistsNov 8-14: 0.4% of 15102 checklistsNov 15-21: 0.5% of 14958 checklistsNov 22-30: 0.5% of 19447 checklistsDec 1-7: 0.5% of 14017 checklistsDec 8-14: 0.5% of 14625 checklistsDec 15-21: 0.5% of 16937 checklistsDec 22-31: 0.5% 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.

Embed this map on your site

Where in New Jersey

Best counties

Share of checklists at the peak
  1. Hudson CountyBest mid July · 316 checklists that week, 21,191 in all46%
  2. Cumberland CountyBest early June · 199 checklists that week, 13,927 in all42%
  3. Bergen CountyBest mid July · 903 checklists that week, 73,457 in all28%
  4. Atlantic CountyBest late May · 900 checklists that week, 28,208 in all23%
  5. Salem CountyBest late July · 143 checklists that week, 9,658 in all18%
  6. Union CountyBest late May · 659 checklists that week, 23,647 in all16%

Best spots

Share of checklists at the peak
  1. Mill Creek MarshHudson County, best the second week of July · 21 checklists that week, 1,764 in all99%
  2. Dennis Creek Wildlife Management AreaCape May County, best late May · 80 checklists that week, 1,924 in all94%
  3. Cheesequake State Park (Conaskonk Point)Monmouth County, best the second week of July · 22 checklists that week, 718 in all93%
  4. Richard W de Korte ParkBergen County, best early July · 175 checklists that week, 10,095 in all91%
  5. Kings CreekUnion County, best the second week of July · 40 checklists that week, 2,390 in all90%

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

Best time of day

In New Jersey, the Marsh Wren is most often listed on checklists started between 5 and 7 pm (3.3% of those checklists).

0%2%4%6%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: 4.3% of 50447 checklists7 am: 2.7% of 118312 checklists8 am: 2.7% of 123273 checklists9 am: 2.6% of 107783 checklists10 am: 2.4% of 97537 checklists11 am: 2.1% of 82427 checklists12 pm: 2.0% of 72581 checklists1 pm: 1.9% of 71478 checklists2 pm: 1.9% of 69994 checklists3 pm: 1.9% of 66822 checklists4 pm: 2.3% of 55950 checklists5 pm: 2.9% of 41360 checklists6 pm: 3.9% 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
January0.4%0.3%0.3%0.2%
February0.2%0.2%0.1%0.2%
March0.1%0.2%0.3%0.3%
April0.3%0.6%1.1%2.8%
May4.2%6.0%6.6%8.0%
June6.9%6.6%6.4%6.6%
July7.0%7.6%8.3%8.4%
August6.4%4.5%3.4%2.8%
September3.0%2.8%2.5%2.2%
October2.1%1.7%1.4%1.0%
November0.9%0.4%0.5%0.5%
December0.5%0.5%0.5%0.5%

Neighboring states

  • Delaware: arrives the second week of April, 1 week earlier than New Jersey
  • Connecticut: arrives late April, 1 week later than New Jersey
  • Pennsylvania: arrives late April, 1 week later than New Jersey
  • New York: arrives late April, 1 week later than New Jersey

Common questions

When do Marsh Wrens arrive in New Jersey?
Marsh Wrens reach New Jersey in mid April, are common by early May, peak in mid July (8.1% of checklists), and most are gone by mid August.
When do Marsh Wrens leave New Jersey?
Most Marsh Wrens have left New Jersey by mid August, when reports fall below half their usual rate. Stragglers are still reported until late October.
When is the best time to see a Marsh Wren in New Jersey?
The Marsh Wren is reported most often in mid July, on about 8.1% of New Jersey checklists.
Where in New Jersey are Marsh Wrens seen most often?
By county, Hudson County, Cumberland County, and Bergen County have the highest peak reporting rates for the Marsh Wren (counties with at least 200 checklists).