WhenToBird

Mimus polyglottos · Mimidae

When Do Northern Mockingbirds Arrive in New Jersey?

Adult Northern Mockingbird
Photo: Bill Keim, CC BY 4.0 via iNaturalist

The Northern Mockingbird is in New Jersey all year. It turns up on about 30% of checklists at its peak (the second week of October) and on 14% in its quietest week (mid February).

When to look

PresentAll year
Peak weekOct 8-14the second week of October
Quietest weekFeb 15-21mid February

Best: the second week of October. Here all year. Peak: on about 30% of New Jersey checklists.

  1. Jancommon
  2. Febcommon
  3. Marcommon
  4. Aprpeak season
  5. Maypeak season
  6. Junpeak season
  7. Julpeak season
  8. Augpeak season
  9. Seppeak season
  10. Octpeak season
  11. Novpeak season
  12. Deccommon

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

0%10%20%30%40%Jan 1-7: 17% of 28167 checklistsJan 8-14: 16% of 20583 checklistsJan 15-21: 15% of 19739 checklistsJan 22-31: 16% of 24586 checklistsFeb 1-7: 15% of 17226 checklistsFeb 8-14: 14% of 19567 checklistsFeb 15-21: 13% of 26553 checklistsFeb 22-28: 14% of 19046 checklistsMar 1-7: 14% of 17969 checklistsMar 8-14: 16% of 18976 checklistsMar 15-21: 18% of 18581 checklistsMar 22-31: 20% of 27590 checklistsApr 1-7: 21% of 21202 checklistsApr 8-14: 23% of 23609 checklistsApr 15-21: 23% of 25056 checklistsApr 22-30: 23% of 36679 checklistsMay 1-7: 23% of 38378 checklistsMay 8-14: 22% of 44071 checklistsMay 15-21: 25% of 34076 checklistsMay 22-31: 25% of 32558 checklistsJun 1-7: 27% of 18049 checklistsJun 8-14: 27% of 15597 checklistsJun 15-21: 27% of 14894 checklistsJun 22-30: 28% of 17187 checklistsJul 1-7: 27% of 13406 checklistsJul 8-14: 27% of 12550 checklistsJul 15-21: 27% of 12358 checklistsJul 22-31: 26% of 18382 checklistsAug 1-7: 23% of 13689 checklistsAug 8-14: 22% of 14006 checklistsAug 15-21: 20% of 14483 checklistsAug 22-31: 18% of 23182 checklistsSep 1-7: 18% of 17984 checklistsSep 8-14: 20% of 18320 checklistsSep 15-21: 22% of 20491 checklistsSep 22-30: 25% of 26176 checklistsOct 1-7: 29% of 24112 checklistsOct 8-14: 31% of 24603 checklistsOct 15-21: 31% of 24549 checklistsOct 22-31: 28% of 26206 checklistsNov 1-7: 25% of 17469 checklistsNov 8-14: 22% of 15102 checklistsNov 15-21: 21% of 14958 checklistsNov 22-30: 20% of 19447 checklistsDec 1-7: 20% of 14017 checklistsDec 8-14: 20% of 14625 checklistsDec 15-21: 22% of 16937 checklistsDec 22-31: 18% 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. Hudson CountyBest mid July · 316 checklists that week, 21,191 in all63%
  2. Cape May CountyBest the second week of June · 2192 checklists that week, 189,832 in all44%
  3. Salem CountyBest early July · 101 checklists that week, 9,658 in all40%
  4. Monmouth CountyBest early October · 1249 checklists that week, 79,748 in all38%
  5. Passaic CountyBest late April · 1220 checklists that week, 24,933 in all36%
  6. Bergen CountyBest mid October · 1471 checklists that week, 73,457 in all33%

Best spots

Share of checklists at the peak
  1. Gateway National Recreation Area (Plum Island)Monmouth County, best the second week of October · 33 checklists that week, 821 in all98%
  2. Mill Creek Point ParkHudson County, best mid July · 20 checklists that week, 842 in all95%
  3. Mill Creek MarshHudson County, best late July · 121 checklists that week, 1,764 in all94%
  4. Meadowlands Commission Trust ParkBergen County, best late October · 25 checklists that week, 369 in all93%
  5. Richard A Rutkowski ParkHudson County, best late June · 20 checklists that week, 870 in all93%
  6. Liberty State ParkHudson County, best the second week of June · 47 checklists that week, 3,747 in all92%

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

Best time of day

In New Jersey, the Northern Mockingbird is most often listed on checklists started between 6 and 8 am (28% 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: 29% of 50447 checklists7 am: 27% of 118312 checklists8 am: 25% of 123273 checklists9 am: 24% of 107783 checklists10 am: 23% of 97537 checklists11 am: 21% of 82427 checklists12 pm: 19% of 72581 checklists1 pm: 19% of 71478 checklists2 pm: 18% of 69994 checklists3 pm: 17% of 66822 checklists4 pm: 17% of 55950 checklists5 pm: 18% of 41360 checklists6 pm: 18% 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
January17%16%15%16%
February15%14%13%14%
March14%16%18%20%
April21%23%23%23%
May23%22%25%25%
June27%27%27%28%
July27%27%27%26%
August23%22%20%18%
September18%20%22%25%
October29%31%31%28%
November25%22%21%20%
December20%20%22%18%

Neighboring states

Common questions

When do Northern Mockingbirds arrive in New Jersey?
The Northern Mockingbird is in New Jersey all year. It turns up on about 30% of checklists at its peak (the second week of October) and on 14% in its quietest week (mid February).
When do Northern Mockingbirds leave New Jersey?
The Northern Mockingbird does not leave New Jersey: it is reported all year, from 14% of checklists in mid February to 30% in the second week of October.
When is the best time to see a Northern Mockingbird in New Jersey?
The Northern Mockingbird is reported most often in the second week of October, on about 30% of New Jersey checklists.
Where in New Jersey are Northern Mockingbirds seen most often?
By county, Hudson County, Cape May County, and Salem County have the highest peak reporting rates for the Northern Mockingbird (counties with at least 200 checklists).