Pool season · Connecticut
New Haven Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
New Haven's whole pool calendar, condensed: when the water warms, when it cools, and where today falls between those edges. Use the opening guide and closing guide for the step-by-step work; keep this page for the dates.
Reading it takes ten seconds: 52 dots, one per week. Solid teal is New Haven's swim season; the hollow teal run before it (May 4 to May 25) is when to open; the hollow amber run after is when to close, with October 9 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The New Haven pool calendar
Opening — target May 11
Target May 11; the practical window runs May 4–May 25, and the 7-day mean crosses the 61°F threshold around May 25. Cold-water starts are the cheap ones.
Closing — deadline October 9
The window opens September 29 once water leaves the algae zone; the model deadline is October 9, a week ahead of the October 27 freeze normal.
Estimated water temperature by month
This is New Haven's typical-year water curve: the same EWMA model as the live widget, run on the 1991–2020 normals instead of this week's weather.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 33° | 31° | 35° | 44° | 54° | 64° | 72° | 74° | 70° | 60° | 49° | 40° |
The curve peaks near 74°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when New Haven hits the closing window
Data: NOAA 1991–2020 climate normals via New Haven Tweed Airport (3.8 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.