New Jersey Pool Season: Opening & Closing Dates by City

Local dates for every featured New Jersey city — when the water warms up, when it cools off, and how long the season actually lasts.

City Opening window Closing window Season
Newark May 13 – Jun 1 Sep 17 – Oct 2 ≈ 125 days
Trenton May 18 – Jun 7 Sep 10 – Sep 28 ≈ 115 days
Atlantic City May 21 – Jun 9 Sep 19 – Oct 7 ≈ 121 days

Windows show the stretch when each city's daily average passes through the low-to-mid 60s°F (1991–2020 NOAA records, nearest station to each city). Click a city for its month-by-month table and full season notes.

Season geography

Across New Jersey's featured cities, typical openings spread from May 22 to May 30, closings from Sep 20 to Sep 28, and the unheated season runs 115–125 days depending on where you are. Elevation, coastal water, and urban heat all pull real dates around, which is exactly why a state-level answer isn't enough.

For your exact town, the pool season lookup takes a ZIP code. Opening day itself is a chemistry job — the dosing calculator turns your first test reading of the year into exact amounts.

New Jersey planning pages

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