Pool season · Texas
Carrollton Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
Carrollton'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.
Carrollton, TX — 154 swim days a yearReading it takes ten seconds: 52 dots, one per week. Solid teal is Carrollton's swim season; the hollow teal run before it (March 5 to March 26) 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 Carrollton pool calendar
Opening — target March 12
Open by March 12 — a two-week head start on the March 26 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 21 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Carrollton'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 46° | 48° | 54° | 62° | 69° | 78° | 83° | 86° | 81° | 72° | 61° | 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 Bryan's pool season and Cedar Park's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Texas season index.
Carrollton pool season FAQ
When should I open my pool in Carrollton, TX?
The site model recommends opening by March 12 — about two weeks before Carrollton'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 Carrollton opening guide.
When should I close my pool in Carrollton?
Winterize by November 9. The model holds the deadline a week ahead of Carrollton's NOAA 50% first-freeze date, so the plumbing is protected before the first hard night. The full sequence is in the Carrollton closing guide.
How long is the swim season in Carrollton?
Carrollton averages 154 days a year with normal highs of 80°F or better — about 4 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 Carrollton?
An unheated pool near Carrollton typically peaks around 86°F in high summer and bottoms out near 46°F in winter, spending roughly 4 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 Carrollton hits the closing window
Data: NOAA 1991–2020 climate normals via Richardson (9.1 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.