Pool season · Washington
Bellingham Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
One bar, one year, one Bellingham pool. The season bar below draws everything the model knows — opening window, prime season, closing window — against today's date, with the working details one click away on the opening and closing pages.
Reading it takes ten seconds: 52 dots, one per week. Solid teal is Bellingham's swim season; the hollow teal run before it (May 31 to June 21) is when to open; the hollow amber run after is when to close, with September 17 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Bellingham pool calendar
Opening — target June 7
Target June 7; the practical window runs May 31–June 21, and the 7-day mean crosses the 61°F threshold around June 21. Cold-water starts are the cheap ones.
Closing — deadline September 17
The window opens September 7 once water leaves the algae zone; the model deadline is September 17, a week ahead of the November 2 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Bellingham'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 41° | 42° | 44° | 48° | 53° | 59° | 63° | 65° | 62° | 56° | 48° | 43° |
The curve peaks near 65°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Bellingham hits the closing window
Data: NOAA 1991–2020 climate normals via Bellingham 3 SSW (3.2 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.