Pool season · California
Pittsburg Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Pittsburg'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.
Reading it takes ten seconds: 52 dots, one per week. Solid teal is Pittsburg's swim season; the hollow teal run before it (March 27 to April 17) is when to open; the hollow amber run after is when to close, with November 10 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Pittsburg pool calendar
Opening — target April 3
Target April 3; the practical window runs March 27–April 17, and the 7-day mean crosses the 61°F threshold around April 17. Cold-water starts are the cheap ones.
Closing — deadline November 10
The window opens October 31 once water leaves the algae zone; the model deadline is November 10, a week ahead of the December 19 freeze normal.
Estimated water temperature by month
This is Pittsburg'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° | 50° | 55° | 59° | 64° | 70° | 75° | 76° | 74° | 70° | 60° | 51° |
The curve peaks near 76°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Pittsburg hits the closing window
Data: NOAA 1991–2020 climate normals via Antioch Pumping Plt #3 (8.2 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.