Pool season · Texas
Flower Mound Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
This is the one-page view of Flower Mound'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.
Flower Mound, TX — 157 swim days a yearEach dot on the bar is one week of Flower Mound's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (March 11–April 1), solid teal is swim season, and hollow amber is the closing window ending November 9. The black marker is today — its position against the colors is the entire executive summary.
The Flower Mound pool calendar
Opening — target March 18
Open by March 18 — a two-week head start on the April 1 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 9
Hold the cover until October 30, then winterize by November 9, a week ahead of the November 17 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Flower Mound'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 El Paso's pool season and Fort Worth's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Texas season index.
Flower Mound pool season FAQ
When should I open my pool in Flower Mound, TX?
The site model recommends opening by March 18 — about two weeks before Flower Mound'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 Flower Mound opening guide.
When should I close my pool in Flower Mound?
Winterize by November 9. The model holds the deadline a week ahead of Flower Mound's NOAA 50% first-freeze date, so the plumbing is protected before the first hard night. The full sequence is in the Flower Mound closing guide.
How long is the swim season in Flower Mound?
Flower Mound 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 Flower Mound?
An unheated pool near Flower Mound 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 Flower Mound hits the closing window
Data: NOAA 1991–2020 climate normals via Grapevine Dam (6.7 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.