Pool season · Washington
Kennewick Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Kennewick'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 Kennewick's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the April 19–May 10 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends October 11. Wherever the today marker sits, the nearest color change is your next appointment.
The Kennewick pool calendar
Opening — target April 26
Open by April 26 — a two-week head start on the May 10 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 11
The window opens October 1 once water leaves the algae zone; the model deadline is October 11, a week ahead of the October 30 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Kennewick'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 35° | 37° | 43° | 51° | 59° | 66° | 74° | 78° | 71° | 61° | 48° | 38° |
Warmest water typically August–August (peaking near 78°F); heaters and covers shift any month up.
Email me when Kennewick hits the closing window
Data: NOAA 1991–2020 climate normals via Kennewick (3.5 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.