Pool season · Missouri
Joplin Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Joplin'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 Joplin's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the April 7–April 28 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends October 20. Wherever the today marker sits, the nearest color change is your next appointment.
The Joplin pool calendar
Opening — target April 14
Open by April 14 — a two-week head start on the April 28 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 20
The window opens October 11 once water leaves the algae zone; the model deadline is October 20, a week ahead of the October 27 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Joplin'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 36° | 36° | 44° | 54° | 62° | 72° | 79° | 80° | 75° | 65° | 53° | 42° |
Warmest water typically July–August (peaking near 80°F); heaters and covers shift any month up.
Email me when Joplin hits the closing window
Data: NOAA 1991–2020 climate normals via Joplin Regional Airport (4.9 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.