Pool season · Delaware
Dover Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
This is the one-page view of Dover's pool year: both model windows, the estimated water-temperature curve, and today's live position on the season bar. The detailed checklists live on the opening and closing guides; this page is the calendar you check between them.
Reading it takes ten seconds: 52 dots, one per week. Solid teal is Dover's swim season; the hollow teal run before it (April 12 to May 3) is when to open; the hollow amber run after is when to close, with October 21 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Dover pool calendar
Opening — target April 19
Target April 19; the practical window runs April 12–May 3, and the 7-day mean crosses the 61°F threshold around May 3. Cold-water starts are the cheap ones.
Closing — deadline October 21
The window opens October 11 once water leaves the algae zone; the model deadline is October 21, a week ahead of the November 4 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Dover's own normals — the shape of a typical year, not a forecast. The widget above shows where the current year actually sits.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 37° | 37° | 42° | 51° | 61° | 69° | 77° | 77° | 74° | 65° | 53° | 44° |
The curve peaks near 78°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Dover hits the closing window
Data: NOAA 1991–2020 climate normals via Dover (1.2 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.