Pool season · California
Concord Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Concord'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.
Each dot on the bar is one week of Concord's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (April 1–April 22), solid teal is swim season, and hollow amber is the closing window ending November 9. The black marker is today — its position against the colors is the entire executive summary.
The Concord pool calendar
Opening — target April 8
Open by April 8 — a two-week head start on the April 22 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 9
The window opens October 30 once water leaves the algae zone; the model deadline is November 9, a week ahead of the December 14 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Concord'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° | 55° | 58° | 63° | 68° | 73° | 74° | 73° | 69° | 60° | 52° |
The curve peaks near 74°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Concord hits the closing window
Data: NOAA 1991–2020 climate normals via Concord Buchanan Field (3.2 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.