WhenToBird

Quiscalus quiscula · Icteridae

When Do Common Grackles Arrive in New Jersey?

Adult Common Grackle
Photo: Derek Spencer, CC BY 4.0 via iNaturalist

Common Grackles are in New Jersey all year, but most are here in spring: numbers build from early March, peak in early June (48% of checklists), and fall back by late July. In the quietest week (early January) they are still on about 6.6% of checklists.

When to look

Numbers buildMar 1-7early March
PeakJun 1-7early June
Fall back byJul 22-31late July
FewestJan 1-7early January

Best: early June. Here all year; numbers build from early March and fall back by late July. Peak: on about 48% of New Jersey checklists.

  1. Januncommon
  2. Febcommon
  3. Marcommon
  4. Aprpeak season
  5. Maypeak season
  6. Junpeak season
  7. Julpeak season
  8. Augcommon
  9. Sepcommon
  10. Octuncommon
  11. Novuncommon
  12. Decuncommon

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

0%20%40%60%Jan 1-7: 6.6% of 28167 checklistsJan 8-14: 6.9% of 20583 checklistsJan 15-21: 7.2% of 19739 checklistsJan 22-31: 8.0% of 24586 checklistsFeb 1-7: 9.3% of 17226 checklistsFeb 8-14: 15% of 19567 checklistsFeb 15-21: 20% of 26553 checklistsFeb 22-28: 25% of 19046 checklistsMar 1-7: 28% of 17969 checklistsMar 8-14: 31% of 18976 checklistsMar 15-21: 31% of 18581 checklistsMar 22-31: 32% of 27590 checklistsApr 1-7: 32% of 21202 checklistsApr 8-14: 36% of 23609 checklistsApr 15-21: 37% of 25056 checklistsApr 22-30: 41% of 36679 checklistsMay 1-7: 45% of 38378 checklistsMay 8-14: 43% of 44071 checklistsMay 15-21: 47% of 34076 checklistsMay 22-31: 47% of 32558 checklistsJun 1-7: 48% of 18049 checklistsJun 8-14: 48% of 15597 checklistsJun 15-21: 46% of 14894 checklistsJun 22-30: 42% of 17187 checklistsJul 1-7: 39% of 13406 checklistsJul 8-14: 35% of 12550 checklistsJul 15-21: 31% of 12358 checklistsJul 22-31: 27% of 18382 checklistsAug 1-7: 26% of 13689 checklistsAug 8-14: 24% of 14006 checklistsAug 15-21: 22% of 14483 checklistsAug 22-31: 22% of 23182 checklistsSep 1-7: 21% of 17984 checklistsSep 8-14: 19% of 18320 checklistsSep 15-21: 16% of 20491 checklistsSep 22-30: 14% of 26176 checklistsOct 1-7: 13% of 24112 checklistsOct 8-14: 13% of 24603 checklistsOct 15-21: 14% of 24549 checklistsOct 22-31: 16% of 26206 checklistsNov 1-7: 18% of 17469 checklistsNov 8-14: 16% of 15102 checklistsNov 15-21: 12% of 14958 checklistsNov 22-30: 9.7% of 19447 checklistsDec 1-7: 7.9% of 14017 checklistsDec 8-14: 7.1% of 14625 checklistsDec 15-21: 8.0% of 16937 checklistsDec 22-31: 6.3% 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. Union CountyBest the second week of May · 872 checklists that week, 23,647 in all69%
  2. Bergen CountyBest late May · 2242 checklists that week, 73,457 in all69%
  3. Middlesex CountyBest late May · 1334 checklists that week, 46,761 in all68%
  4. Essex CountyBest the second week of May · 1083 checklists that week, 28,396 in all63%
  5. Passaic CountyBest the second week of May · 1413 checklists that week, 24,933 in all60%
  6. Hudson CountyBest the second week of May · 776 checklists that week, 21,191 in all56%

Best spots

Share of checklists at the peak
  1. Waterland ParkEssex County, best late April · 35 checklists that week, 410 in all98%
  2. Clarks PondEssex County, best the second week of May · 29 checklists that week, 458 in all97%
  3. Memorial ParkEssex County, best the second week of March · 24 checklists that week, 1,662 in all96%
  4. Brightwood ParkUnion County, best late April · 32 checklists that week, 277 in all96%
  5. Mahwah Township TrailBergen County, best late May · 54 checklists that week, 1,179 in all96%
  6. Lake CarasaljoOcean County, best early May · 20 checklists that week, 1,087 in all95%

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

Best time of day

In New Jersey, the Common Grackle is most often listed on checklists started between 6 and 8 am (38% of those checklists).

0%20%40%60%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: 44% of 50447 checklists7 am: 36% of 118312 checklists8 am: 29% of 123273 checklists9 am: 26% of 107783 checklists10 am: 22% of 97537 checklists11 am: 20% of 82427 checklists12 pm: 18% of 72581 checklists1 pm: 18% of 71478 checklists2 pm: 18% of 69994 checklists3 pm: 19% of 66822 checklists4 pm: 22% of 55950 checklists5 pm: 27% of 41360 checklists6 pm: 30% 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
January6.6%6.9%7.2%8.0%
February9.3%15%20%25%
March28%31%31%32%
April32%36%37%41%
May45%43%47%47%
June48%48%46%42%
July39%35%31%27%
August26%24%22%22%
September21%19%16%14%
October13%13%14%16%
November18%16%12%9.7%
December7.9%7.1%8.0%6.3%

Neighboring states

  • Delaware: arrives mid March, 2 weeks later than New Jersey
  • Connecticut: arrives early March, in the same week than New Jersey
  • Pennsylvania: arrives early February, 4 weeks earlier than New Jersey
  • New York: arrives the second week of February, 3 weeks earlier than New Jersey

Common questions

When do Common Grackles arrive in New Jersey?
Common Grackles are in New Jersey all year, but most are here in spring: numbers build from early March, peak in early June (48% of checklists), and fall back by late July. In the quietest week (early January) they are still on about 6.6% of checklists.
When do Common Grackles leave New Jersey?
Common Grackles never fully leave New Jersey: numbers fall back below half their usual rate by late July, but some are still reported in every week, about 6.6% of checklists at the low.
When is the best time to see a Common Grackle in New Jersey?
The Common Grackle is reported most often in early June, on about 48% of New Jersey checklists.
Where in New Jersey are Common Grackles seen most often?
By county, Union County, Bergen County, and Middlesex County have the highest peak reporting rates for the Common Grackle (counties with at least 200 checklists).