Pool season · Texas
Lewisville Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
One bar, one year, one Lewisville pool. The season bar below draws everything the model knows — opening window, prime season, closing window — against today's date, with the working details one click away on the opening and closing pages.
Reading it takes ten seconds: 52 dots, one per week. Solid teal is Lewisville's swim season; the hollow teal run before it (March 11 to April 1) is when to open; the hollow amber run after is when to close, with November 9 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Lewisville pool calendar
Opening — target March 18
Target March 18; the practical window runs March 11–April 1, and the 7-day mean crosses the 61°F threshold around April 1. Cold-water starts are the cheap ones.
Closing — deadline November 9
The window opens October 30 once water leaves the algae zone; the model deadline is November 9, a week ahead of the November 17 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Lewisville'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 45° | 47° | 53° | 61° | 68° | 78° | 83° | 86° | 81° | 72° | 60° | 51° |
Warmest water typically June–September (peaking near 86°F); heaters and covers shift any month up.
Email me when Lewisville hits the closing window
Data: NOAA 1991–2020 climate normals via Grapevine Dam (7.8 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.