Pool season · California
Tustin Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Tustin'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 Tustin's swim season; the hollow teal run before it (February 16 to March 9) is when to open; the hollow amber run after is when to close, with December 4 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Tustin pool calendar
Opening — target February 23
Open by February 23 — a two-week head start on the March 9 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline December 4
The window opens November 24 once water leaves the algae zone; the model deadline is December 4, a week ahead of the December 25 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Tustin'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 59° | 59° | 60° | 63° | 65° | 68° | 72° | 74° | 75° | 72° | 67° | 60° |
The curve peaks near 75°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Tustin hits the closing window
Data: NOAA 1991–2020 climate normals via Santa Ana Fire Station (3.4 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.