Pool season · California
Hayward Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Hayward'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.
The bar compresses Hayward's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the April 28–May 19 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends November 7. Wherever the today marker sits, the nearest color change is your next appointment.
The Hayward pool calendar
Opening — target May 5
Open by May 5 — a two-week head start on the May 19 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 7
The window opens October 28 once water leaves the algae zone; the model deadline is November 7, a week ahead of the December 25 freeze normal.
Estimated water temperature by month
This is Hayward'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 51° | 52° | 55° | 57° | 60° | 63° | 66° | 67° | 68° | 66° | 60° | 53° |
The curve peaks near 68°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Hayward hits the closing window
Data: NOAA 1991–2020 climate normals via Hayward Air Terminal (2.5 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.