Pool season · Texas
Lewisville Pool Season: the Year on One Bar
Last updated: July 25, 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.
Lewisville, TX — 157 swim days a yearReading 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.
Every station tells its own story: compare this curve with Leander's pool season and Longview's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Texas season index.
Lewisville pool season FAQ
When should I open my pool in Lewisville, TX?
The site model recommends opening by March 18 — about two weeks before Lewisville's 7-day mean temperature crosses 61°F, while the water is still too cold for algae. The step-by-step sequence is in the Lewisville opening guide.
When should I close my pool in Lewisville?
Winterize by November 9. The model holds the deadline a week ahead of Lewisville's NOAA 50% first-freeze date, so the plumbing is protected before the first hard night. The full sequence is in the Lewisville closing guide.
How long is the swim season in Lewisville?
Lewisville averages 157 days a year with normal highs of 80°F or better — about 10 days later than the Texas median. The Texas season index ranks all 68 covered cities by the same metric.
How warm does pool water get in Lewisville?
An unheated pool near Lewisville typically peaks around 86°F in high summer and bottoms out near 44°F in winter, spending roughly 3 months at or above the 78°F comfort line most swimmers prefer. The month-by-month curve above shows the whole cycle; the methodology page explains the ±5°F error bars.
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.