Pool season · California
Pleasanton Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
One bar, one year, one Pleasanton 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.
Pleasanton, CA — 129 swim days a yearReading it takes ten seconds: 52 dots, one per week. Solid teal is Pleasanton's swim season; the hollow teal run before it (April 12 to May 3) is when to open; the hollow amber run after is when to close, with November 3 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Pleasanton pool calendar
Opening — target April 19
Target April 19; the practical window runs April 12–May 3, and the 7-day mean crosses the 61°F threshold around May 3. Cold-water starts are the cheap ones.
Closing — deadline November 3
Hold the cover until October 24, then winterize by November 3, a week ahead of the December 2 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Pleasanton'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 47° | 49° | 53° | 56° | 61° | 66° | 72° | 73° | 72° | 67° | 58° | 50° |
The curve peaks near 73°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with Pittsburg's pool season and Pomona's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the California season index.
Pleasanton pool season FAQ
When should I open my pool in Pleasanton, CA?
Target April 19. That date backs off two weeks from the day Pleasanton's 7-day mean temperature reaches 61°F, so you start up in cold, algae-resistant water. Work the full checklist in the Pleasanton opening guide.
When should I close my pool in Pleasanton?
The closing deadline is November 3 — late enough that the water has cooled out of the algae zone, early enough to beat Pleasanton's first-freeze normal by about a week. See the Pleasanton closing guide for the winterizing steps.
How long is the swim season in Pleasanton?
Pleasanton averages 129 days a year with normal highs of 80°F or better — about 18 days later than the California median. The California season index ranks all 147 covered cities by the same metric.
How warm does pool water get in Pleasanton?
An unheated pool near Pleasanton typically peaks around 73°F in high summer and bottoms out near 47°F in winter, never quite reaching the 78°F comfort line without a heater or solar cover. The month-by-month curve above shows the whole cycle; the methodology page explains the ±5°F error bars.
Email me when Pleasanton hits the closing window
Data: NOAA 1991–2020 climate normals via Livermore (4.0 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.