Pool season · Tennessee
Spring Hill Pool Season: the Year on One Bar
Last updated: July 25, 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.
Spring Hill, TN — 132 swim days a yearReading 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.
Every station tells its own story: compare this curve with Nashville's pool season and Bristol's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Tennessee season index.
Spring Hill pool season FAQ
When should I open my pool in Spring Hill, TN?
The site model recommends opening by April 8 — about two weeks before Spring Hill'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 Spring Hill opening guide.
When should I close my pool in Spring Hill?
Winterize by October 25. The model holds the deadline a week ahead of Spring Hill's NOAA 50% first-freeze date, so the plumbing is protected before the first hard night. The full sequence is in the Spring Hill closing guide.
How long is the swim season in Spring Hill?
Spring Hill averages 132 days a year with normal highs of 80°F or better — right on the statewide median. The Tennessee season index ranks all 14 covered cities by the same metric.
How warm does pool water get in Spring Hill?
An unheated pool near Spring Hill typically peaks around 79°F in high summer and bottoms out near 38°F in winter, spending roughly 2 months 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 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.