Pool season · California
Stockton Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
One bar, one year, one Stockton 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.
Stockton, CA — 169 swim days a yearEach dot on the bar is one week of Stockton'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 20–April 10), solid teal is swim season, and hollow amber is the closing window ending November 10. The black marker is today — its position against the colors is the entire executive summary.
The Stockton pool calendar
Opening — target March 27
Open by March 27 — a two-week head start on the April 10 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 10
Hold the cover until October 31, then winterize by November 10, a week ahead of the December 8 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Stockton'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 48° | 51° | 56° | 60° | 66° | 72° | 77° | 78° | 76° | 71° | 61° | 52° |
Warmest water typically August–August (peaking near 78°F); heaters and covers shift any month up.
Every station tells its own story: compare this curve with South Gate's pool season and Sunnyvale's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the California season index.
Stockton pool season FAQ
When should I open my pool in Stockton, CA?
Target March 27. That date backs off two weeks from the day Stockton's 7-day mean temperature reaches 61°F, so you start up in cold, algae-resistant water. Work the full checklist in the Stockton opening guide.
When should I close my pool in Stockton?
The closing deadline is November 10 — late enough that the water has cooled out of the algae zone, early enough to beat Stockton's first-freeze normal by about a week. See the Stockton closing guide for the winterizing steps.
How long is the swim season in Stockton?
Stockton averages 169 days a year with normal highs of 80°F or better — about 5 days earlier than the California median. The California season index ranks all 147 covered cities by the same metric.
How warm does pool water get in Stockton?
An unheated pool near Stockton typically peaks around 78°F in high summer and bottoms out near 48°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 Stockton hits the closing window
Data: NOAA 1991–2020 climate normals via Stockton Fire Station 4 (1.6 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.