Pool season · Kansas
Olathe Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
One bar, one year, one Olathe 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.
Olathe, KS — 103 swim days a yearReading it takes ten seconds: 52 dots, one per week. Solid teal is Olathe's swim season; the hollow teal run before it (April 14 to May 5) is when to open; the hollow amber run after is when to close, with October 16 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Olathe pool calendar
Opening — target April 21
Open by April 21 — a two-week head start on the May 5 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 16
Hold the cover until October 6, then winterize by October 16, a week ahead of the October 29 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Olathe's typical-year water curve: the same EWMA model as the live widget, run on the 1991–2020 normals instead of this week's weather.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 30° | 31° | 40° | 50° | 60° | 70° | 77° | 78° | 73° | 63° | 51° | 38° |
Warmest water typically August–August (peaking near 79°F); heaters and covers shift any month up.
Every station tells its own story: compare this curve with Lawrence's pool season and Overland Park's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Kansas season index.
Olathe pool season FAQ
When should I open my pool in Olathe, KS?
The site model recommends opening by April 21 — about two weeks before Olathe's 7-day mean temperature crosses 61°F, while the water is still too cold for algae. The step-by-step sequence is in the Olathe opening guide.
When should I close my pool in Olathe?
Winterize by October 16. The model holds the deadline a week ahead of Olathe's NOAA 50% first-freeze date, so the plumbing is protected before the first hard night. The full sequence is in the Olathe closing guide.
How long is the swim season in Olathe?
Olathe averages 103 days a year with normal highs of 80°F or better — right on the statewide median. The Kansas season index ranks all 6 covered cities by the same metric.
How warm does pool water get in Olathe?
An unheated pool near Olathe typically peaks around 79°F in high summer and bottoms out near 30°F in winter, spending roughly 1 month at or above the 78°F comfort line most swimmers prefer. The month-by-month curve above shows the whole cycle; the methodology page explains the ±5°F error bars.
Email me when Olathe hits the closing window
Data: NOAA 1991–2020 climate normals via Olathe 3e (3.2 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.