WhenToBird

Ammospiza maritima · Passerellidae

When Do Seaside Sparrows Arrive in New Jersey?

Adult Seaside Sparrow
Photo: Jonathan Layman, CC BY 4.0 via iNaturalist

Seaside Sparrows reach New Jersey in mid April, are common by late April, peak in late May (3.5% of checklists), and most are gone by the second week of August.

When to look

First arrivalsApr 15-21mid April
Common byApr 22-30late April
PeakMay 22-31late May
Most gone byAug 8-14the second week of August

Best: late May. First arrivals mid April; most are gone by the second week of August. Peak: on about 3.5% of New Jersey checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marrare
  4. Aprcommon
  5. Maypeak season
  6. Junpeak season
  7. Julcommon
  8. Augcommon
  9. Sepuncommon
  10. Octuncommon
  11. Novrare
  12. Decrare

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

0%1%2%3%4%Jan 1-7: 0.1% of 28167 checklistsJan 8-14: 0.1% 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: 0.1% 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: 0.1% of 27590 checklistsApr 1-7: 0.2% of 21202 checklistsApr 8-14: 0.4% of 23609 checklistsApr 15-21: 0.8% of 25056 checklistsApr 22-30: 1.6% of 36679 checklistsMay 1-7: 2.2% of 38378 checklistsMay 8-14: 2.9% of 44071 checklistsMay 15-21: 3.9% of 34076 checklistsMay 22-31: 3.6% of 32558 checklistsJun 1-7: 2.5% of 18049 checklistsJun 8-14: 1.9% of 15597 checklistsJun 15-21: 2.2% of 14894 checklistsJun 22-30: 2.2% of 17187 checklistsJul 1-7: 2.1% of 13406 checklistsJul 8-14: 2.1% of 12550 checklistsJul 15-21: 1.8% of 12358 checklistsJul 22-31: 1.8% of 18382 checklistsAug 1-7: 1.5% of 13689 checklistsAug 8-14: 1.3% of 14006 checklistsAug 15-21: 1.0% of 14483 checklistsAug 22-31: 0.7% of 23182 checklistsSep 1-7: 0.5% of 17984 checklistsSep 8-14: 0.6% of 18320 checklistsSep 15-21: 0.5% of 20491 checklistsSep 22-30: 0.5% of 26176 checklistsOct 1-7: 0.6% of 24112 checklistsOct 8-14: 0.6% of 24603 checklistsOct 15-21: 0.6% of 24549 checklistsOct 22-31: 0.5% of 26206 checklistsNov 1-7: 0.1% of 17469 checklistsNov 8-14: 0.1% of 15102 checklistsNov 15-21: 0.1% of 14958 checklistsNov 22-30: 0.1% of 19447 checklistsDec 1-7: 0.1% of 14017 checklistsDec 8-14: 0.1% of 14625 checklistsDec 15-21: 0.2% of 16937 checklistsDec 22-31: 0.2% 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. Cumberland CountyBest early June · 199 checklists that week, 13,927 in all27%
  2. Atlantic CountyBest late May · 900 checklists that week, 28,208 in all17%
  3. Ocean CountyBest late May · 2579 checklists that week, 87,340 in all9.5%
  4. Cape May CountyBest late May · 6288 checklists that week, 189,832 in all6.5%
  5. Salem CountyBest the second week of May · 436 checklists that week, 9,658 in all2.9%
  6. Monmouth CountyBest late July · 1581 checklists that week, 79,748 in all2.7%

Best spots

Share of checklists at the peak
  1. Dennis Creek Wildlife Management AreaCape May County, best the second week of June · 20 checklists that week, 1,924 in all89%
  2. Great Bay Boulevard Wildlife Management AreaOcean County, best early July · 21 checklists that week, 1,138 in all89%
  3. Glades Wildlife RefugeCumberland County, best early May · 40 checklists that week, 588 in all83%
  4. Cooks BeachCape May County, best the second week of June · 21 checklists that week, 1,270 in all83%
  5. Cheesequake State Park (Conaskonk Point)Monmouth County, best late July · 37 checklists that week, 718 in all82%

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

Best time of day

In New Jersey, the Seaside Sparrow is most often listed on checklists started between 5 and 7 pm (1.2% of those checklists).

0%0.5%1%1.5%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: 1.3% of 50447 checklists7 am: 0.9% of 118312 checklists8 am: 0.9% of 123273 checklists9 am: 0.9% of 107783 checklists10 am: 1.0% of 97537 checklists11 am: 0.9% of 82427 checklists12 pm: 0.9% of 72581 checklists1 pm: 0.8% of 71478 checklists2 pm: 0.8% of 69994 checklists3 pm: 0.8% of 66822 checklists4 pm: 1.0% of 55950 checklists5 pm: 1.1% of 41360 checklists6 pm: 1.4% 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%0.1%0.1%0.1%
February0.1%0.1%0.1%0.1%
March0.1%0.1%0.1%0.1%
April0.2%0.4%0.8%1.6%
May2.2%2.9%3.9%3.6%
June2.5%1.9%2.2%2.2%
July2.1%2.1%1.8%1.8%
August1.5%1.3%1.0%0.7%
September0.5%0.6%0.5%0.5%
October0.6%0.6%0.6%0.5%
November0.1%0.1%0.1%0.1%
December0.1%0.1%0.2%0.2%

Neighboring states

  • Delaware: arrives the second week of April, 1 week earlier than New Jersey
  • Connecticut: arrives early May, 2 weeks later than New Jersey
  • Rhode Island: arrives mid June, 8 weeks later than New Jersey
  • South Carolina: arrives early July, 10 weeks later than New Jersey

Common questions

When do Seaside Sparrows arrive in New Jersey?
Seaside Sparrows reach New Jersey in mid April, are common by late April, peak in late May (3.5% of checklists), and most are gone by the second week of August.
When do Seaside Sparrows leave New Jersey?
Most Seaside Sparrows have left New Jersey by the second week of August, when reports fall below half their usual rate.
When is the best time to see a Seaside Sparrow in New Jersey?
The Seaside Sparrow is reported most often in late May, on about 3.5% of New Jersey checklists.
Where in New Jersey are Seaside Sparrows seen most often?
By county, Cumberland County, Atlantic County, and Ocean County have the highest peak reporting rates for the Seaside Sparrow (counties with at least 200 checklists).