Pool season · Texas
Plano Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
This is the one-page view of Plano'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.
Plano, TX — 154 swim days a yearEach dot on the bar is one week of Plano'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 5–March 26), 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 Plano pool calendar
Opening — target March 12
Target March 12; the practical window runs March 5–March 26, and the 7-day mean crosses the 61°F threshold around March 26. 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 21 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Plano'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 Pharr's pool season and Port Arthur's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Texas season index.
Plano pool season FAQ
When should I open my pool in Plano, TX?
Target March 12. That date backs off two weeks from the day Plano's 7-day mean temperature reaches 61°F, so you start up in cold, algae-resistant water. Work the full checklist in the Plano opening guide.
When should I close my pool in Plano?
The closing deadline is November 9 — late enough that the water has cooled out of the algae zone, early enough to beat Plano's first-freeze normal by about a week. See the Plano closing guide for the winterizing steps.
How long is the swim season in Plano?
Plano 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 Plano?
An unheated pool near Plano 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 Plano hits the closing window
Data: NOAA 1991–2020 climate normals via Richardson (3.7 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.