Pool season · Washington
Spokane Valley Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
This is the one-page view of Spokane Valley's pool year: both model windows, the estimated water-temperature curve, and today's live position on the season bar. The detailed checklists live on the opening and closing guides; this page is the calendar you check between them.
Spokane Valley, WA — 70 swim days a yearEach dot on the bar is one week of Spokane Valley'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 Valley pool calendar
Opening — target May 23
Open by May 23 — a two-week head start on the June 6 crossing keeps startup chemistry small and beats the local service rush.
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 Valley'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.
Every station tells its own story: compare this curve with Spokane's pool season and Tacoma's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Washington season index.
Spokane Valley pool season FAQ
When should I open my pool in Spokane Valley, WA?
Open by May 23 — the model places Spokane Valley's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The Spokane Valley opening guide has the 12-step sequence.
When should I close my pool in Spokane Valley?
Close by September 27: cool water keeps its winter chemistry, but freeze damage is the hard stop. The Spokane Valley closing guide sequences the work backward from that date.
How long is the swim season in Spokane Valley?
Spokane Valley averages 70 days a year with normal highs of 80°F or better — right on the statewide median. The Washington season index ranks all 21 covered cities by the same metric.
How warm does pool water get in Spokane Valley?
An unheated pool near Spokane Valley typically peaks around 73°F in high summer and bottoms out near 31°F in winter, never quite reaching the 78°F comfort line without a heater or solar cover. The month-by-month curve above shows the whole cycle; the methodology page explains the ±5°F error bars.
Email me when Spokane Valley hits the closing window
Data: NOAA 1991–2020 climate normals via Spokane Felts Field (4.3 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.