Pool season · California
Gilroy Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Gilroy'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 Gilroy'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 5 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Gilroy 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 5
Hold the cover until October 26, then winterize by November 5, a week ahead of the November 27 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Gilroy'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 49° | 51° | 54° | 57° | 61° | 65° | 69° | 71° | 70° | 66° | 59° | 51° |
The curve peaks near 71°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Gilroy hits the closing window
Data: NOAA 1991–2020 climate normals via Gilroy (1.4 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.