Pool season · Tennessee
Spring Hill Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Spring Hill'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.
Reading it takes ten seconds: 52 dots, one per week. Solid teal is Spring Hill's swim season; the hollow teal run before it (April 1 to April 22) is when to open; the hollow amber run after is when to close, with October 25 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Spring Hill pool calendar
Opening — target April 8
Target April 8; the practical window runs April 1–April 22, and the 7-day mean crosses the 61°F threshold around April 22. Cold-water starts are the cheap ones.
Closing — deadline October 25
The window opens October 15 once water leaves the algae zone; the model deadline is October 25, a week ahead of the November 1 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Spring Hill'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 39° | 39° | 46° | 55° | 64° | 73° | 79° | 79° | 77° | 67° | 55° | 45° |
Warmest water typically July–August (peaking near 79°F); heaters and covers shift any month up.
Email me when Spring Hill hits the closing window
Data: NOAA 1991–2020 climate normals via Thompson Station (1.8 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.