Pool season · Texas
Richardson Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
Richardson'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.
Richardson, TX — 154 swim days a yearThe bar compresses Richardson's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the March 5–March 26 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends November 9. Wherever the today marker sits, the nearest color change is your next appointment.
The Richardson 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
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
This is Richardson'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 Port Arthur's pool season and Round Rock's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Texas season index.
Richardson pool season FAQ
When should I open my pool in Richardson, TX?
The site model recommends opening by March 12 — about two weeks before Richardson'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 Richardson opening guide.
When should I close my pool in Richardson?
Winterize by November 9. The model holds the deadline a week ahead of Richardson's NOAA 50% first-freeze date, so the plumbing is protected before the first hard night. The full sequence is in the Richardson closing guide.
How long is the swim season in Richardson?
Richardson 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 Richardson?
An unheated pool near Richardson 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 Richardson hits the closing window
Data: NOAA 1991–2020 climate normals via Richardson (2.6 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.