Pool season · Kansas
Overland Park Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
Overland Park'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.
Overland Park, KS — 100 swim days a yearEach dot on the bar is one week of Overland Park's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (April 15–May 6), solid teal is swim season, and hollow amber is the closing window ending October 15. The black marker is today — its position against the colors is the entire executive summary.
The Overland Park pool calendar
Opening — target April 22
Open by April 22 — a two-week head start on the May 6 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 15
Hold the cover until October 5, then winterize by October 15, a week ahead of the October 29 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Overland Park'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 31° | 31° | 40° | 51° | 60° | 70° | 77° | 78° | 73° | 62° | 50° | 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 Olathe's pool season and Topeka's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Kansas season index.
Overland Park pool season FAQ
When should I open my pool in Overland Park, KS?
The site model recommends opening by April 22 — about two weeks before Overland Park'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 Overland Park opening guide.
When should I close my pool in Overland Park?
Winterize by October 15. The model holds the deadline a week ahead of Overland Park's NOAA 50% first-freeze date, so the plumbing is protected before the first hard night. The full sequence is in the Overland Park closing guide.
How long is the swim season in Overland Park?
Overland Park averages 100 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 Overland Park?
An unheated pool near Overland Park 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 Overland Park hits the closing window
Data: NOAA 1991–2020 climate normals via Olathe Johnson Co Executive Airport (3.8 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.