Pool season · Washington
Kirkland Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
One bar, one year, one Kirkland 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.
Kirkland, WA — 0 swim days a yearReading it takes ten seconds: 52 dots, one per week. Solid teal is Kirkland's swim season; the hollow teal run before it (May 24 to June 14) is when to open; the hollow amber run after is when to close, with October 1 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Kirkland pool calendar
Opening — target May 31
Open by May 31 — a two-week head start on the June 14 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 1
Hold the cover until September 21, then winterize by October 1, a week ahead of the November 23 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Kirkland'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 42° | 43° | 45° | 49° | 54° | 60° | 64° | 68° | 65° | 58° | 50° | 44° |
The curve peaks near 68°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with Kent's pool season and Marysville's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Washington season index.
Kirkland pool season FAQ
When should I open my pool in Kirkland, WA?
Open by May 31 — the model places Kirkland's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The Kirkland opening guide has the 12-step sequence.
When should I close my pool in Kirkland?
Close by October 1: cool water keeps its winter chemistry, but freeze damage is the hard stop. The Kirkland closing guide sequences the work backward from that date.
How long is the swim season in Kirkland?
Kirkland averages 0 days a year with normal highs of 80°F or better — about 7 days later than the Washington median. The Washington season index ranks all 21 covered cities by the same metric.
How warm does pool water get in Kirkland?
An unheated pool near Kirkland typically peaks around 68°F in high summer and bottoms out near 41°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 Kirkland hits the closing window
Data: NOAA 1991–2020 climate normals via Seattle Sand Pt WSFO (2.4 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.