Pool season · Washington
Olympia Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Olympia'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 Olympia's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the June 7–June 28 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends September 18. Wherever the today marker sits, the nearest color change is your next appointment.
The Olympia pool calendar
Opening — target June 14
Target June 14; the practical window runs June 7–June 28, and the 7-day mean crosses the 61°F threshold around June 28. Cold-water starts are the cheap ones.
Closing — deadline September 18
Hold the cover until September 8, then winterize by September 18, a week ahead of the October 14 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Olympia'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 39° | 40° | 42° | 46° | 52° | 57° | 62° | 65° | 62° | 55° | 46° | 40° |
The curve peaks near 65°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Olympia hits the closing window
Data: NOAA 1991–2020 climate normals via Olympia Airport (4.7 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.