WhenToBird

Progne subis · Hirundinidae

When Do Purple Martins Arrive in New Jersey?

Adult female Purple Martin
Photo: Ron Bondy, CC BY-SA 4.0 via iNaturalist

Purple Martins reach New Jersey in early April, are common by mid April, peak in late July (17% of checklists), and most are gone by late August.

When to look

First arrivalsApr 1-7early April
Common byApr 15-21mid April
PeakJul 22-31late July
Most gone byAug 22-31late August

Best: late July. First arrivals early April; most are gone by late August. Peak: on about 17% of New Jersey checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marrare
  4. Aprcommon
  5. Maycommon
  6. Juncommon
  7. Julpeak season
  8. Augpeak season
  9. Sepuncommon
  10. Octnot usually seen
  11. Novnot usually seen
  12. Decnot usually seen

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

0%5%10%15%20%Jan 1-7: 0% of 28167 checklistsJan 8-14: 0% of 20583 checklistsJan 15-21: 0% of 19739 checklistsJan 22-31: 0% of 24586 checklistsFeb 1-7: 0% of 17226 checklistsFeb 8-14: 0% of 19567 checklistsFeb 15-21: 0% of 26553 checklistsFeb 22-28: 0% 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: 0.8% of 27590 checklistsApr 1-7: 2.3% of 21202 checklistsApr 8-14: 4.6% of 23609 checklistsApr 15-21: 6.9% of 25056 checklistsApr 22-30: 8.2% of 36679 checklistsMay 1-7: 9.1% of 38378 checklistsMay 8-14: 9.8% of 44071 checklistsMay 15-21: 13% of 34076 checklistsMay 22-31: 12% of 32558 checklistsJun 1-7: 12% of 18049 checklistsJun 8-14: 11% of 15597 checklistsJun 15-21: 12% of 14894 checklistsJun 22-30: 11% of 17187 checklistsJul 1-7: 12% of 13406 checklistsJul 8-14: 13% of 12550 checklistsJul 15-21: 16% of 12358 checklistsJul 22-31: 18% of 18382 checklistsAug 1-7: 17% of 13689 checklistsAug 8-14: 15% of 14006 checklistsAug 15-21: 12% of 14483 checklistsAug 22-31: 7.9% of 23182 checklistsSep 1-7: 4.3% of 17984 checklistsSep 8-14: 2.4% of 18320 checklistsSep 15-21: 0.4% of 20491 checklistsSep 22-30: 0.1% of 26176 checklistsOct 1-7: 0% of 24112 checklistsOct 8-14: 0.1% of 24603 checklistsOct 15-21: 0% of 24549 checklistsOct 22-31: 0% of 26206 checklistsNov 1-7: 0% of 17469 checklistsNov 8-14: 0% of 15102 checklistsNov 15-21: 0% of 14958 checklistsNov 22-30: 0% of 19447 checklistsDec 1-7: 0% of 14017 checklistsDec 8-14: 0% of 14625 checklistsDec 15-21: 0% of 16937 checklistsDec 22-31: 0% 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. Cape May CountyBest late July · 2809 checklists that week, 189,832 in all48%
  2. Atlantic CountyBest late May · 900 checklists that week, 28,208 in all31%
  3. Cumberland CountyBest late July · 149 checklists that week, 13,927 in all29%
  4. Salem CountyBest late July · 143 checklists that week, 9,658 in all27%
  5. Burlington CountyBest early August · 802 checklists that week, 52,358 in all26%
  6. Ocean CountyBest early August · 1242 checklists that week, 87,340 in all23%

Best spots

Share of checklists at the peak
  1. Lily Lake (west)Atlantic County, best the second week of July · 21 checklists that week, 1,693 in all94%
  2. Cape May Point State ParkCape May County, best early July · 107 checklists that week, 13,012 in all93%
  3. Cape May Migratory Bird RefugeCape May County, best late June · 258 checklists that week, 15,664 in all93%
  4. The Wetlands Institute PreserveCape May County, best the second week of June · 36 checklists that week, 3,679 in all93%
  5. Lake Lily (Cape May Point)Cape May County, best late July · 35 checklists that week, 1,952 in all92%
  6. Cape May Point State Park (southwest)Cape May County, best early July · 27 checklists that week, 9,860 in all92%

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

Best time of day

In New Jersey, the Purple Martin is most often listed on checklists started between 6 and 8 am (6.5% of those checklists).

0%5%10%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: 8.5% of 50447 checklists7 am: 5.6% of 118312 checklists8 am: 5.0% of 123273 checklists9 am: 4.7% of 107783 checklists10 am: 4.6% of 97537 checklists11 am: 4.0% of 82427 checklists12 pm: 3.4% of 72581 checklists1 pm: 3.2% of 71478 checklists2 pm: 3.1% of 69994 checklists3 pm: 3.2% of 66822 checklists4 pm: 3.5% of 55950 checklists5 pm: 5.0% of 41360 checklists6 pm: 6.8% 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%0%0%0%
February0%0%0%0%
March0.1%0.1%0.1%0.8%
April2.3%4.6%6.9%8.2%
May9.1%9.8%13%12%
June12%11%12%11%
July12%13%16%18%
August17%15%12%7.9%
September4.3%2.4%0.4%0.1%
October0%0.1%0%0%
November0%0%0%0%
December0%0%0%0%

Neighboring states

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

Common questions

When do Purple Martins arrive in New Jersey?
Purple Martins reach New Jersey in early April, are common by mid April, peak in late July (17% of checklists), and most are gone by late August.
When do Purple Martins leave New Jersey?
Most Purple Martins have left New Jersey by late August, when reports fall below half their usual rate. Stragglers are still reported until the second week of September.
When is the best time to see a Purple Martin in New Jersey?
The Purple Martin is reported most often in late July, on about 17% of New Jersey checklists.
Where in New Jersey are Purple Martins seen most often?
By county, Cape May County, Atlantic County, and Cumberland County have the highest peak reporting rates for the Purple Martin (counties with at least 200 checklists).