Pool season · Washington
Spokane Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Spokane'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 Spokane's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (May 16–June 6), solid teal is swim season, and hollow amber is the closing window ending September 27. The black marker is today — its position against the colors is the entire executive summary.
The Spokane pool calendar
Opening — target May 23
Target May 23; the practical window runs May 16–June 6, and the 7-day mean crosses the 61°F threshold around June 6. Cold-water starts are the cheap ones.
Closing — deadline September 27
The window opens September 17 once water leaves the algae zone; the model deadline is September 27, a week ahead of the October 15 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Spokane'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 31° | 33° | 38° | 45° | 53° | 60° | 68° | 72° | 66° | 55° | 43° | 34° |
The curve peaks near 73°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Spokane hits the closing window
Data: NOAA 1991–2020 climate normals via Spokane Felts Field (5.3 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.