Pool season · Tennessee
Nashville Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
This is the one-page view of Nashville's pool year: both model windows, the estimated water-temperature curve, and today's live position on the season bar. The detailed checklists live on the opening and closing guides; this page is the calendar you check between them.
Nashville, TN — 134 swim days a yearThe bar compresses Nashville's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the March 30–April 20 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends October 23. Wherever the today marker sits, the nearest color change is your next appointment.
The Nashville pool calendar
Opening — target April 6
Open by April 6 — a two-week head start on the April 20 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 23
Hold the cover until October 13, then winterize by October 23, a week ahead of the October 31 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Nashville'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° | 56° | 64° | 72° | 78° | 79° | 75° | 66° | 54° | 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 Murfreesboro's pool season and Spring Hill's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Tennessee season index.
Nashville pool season FAQ
When should I open my pool in Nashville, TN?
Target April 6. That date backs off two weeks from the day Nashville's 7-day mean temperature reaches 61°F, so you start up in cold, algae-resistant water. Work the full checklist in the Nashville opening guide.
When should I close my pool in Nashville?
The closing deadline is October 23 — late enough that the water has cooled out of the algae zone, early enough to beat Nashville's first-freeze normal by about a week. See the Nashville closing guide for the winterizing steps.
How long is the swim season in Nashville?
Nashville averages 134 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 Nashville?
An unheated pool near Nashville typically peaks around 79°F in high summer and bottoms out near 38°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 Nashville hits the closing window
Data: NOAA 1991–2020 climate normals via Shelby Bottoms Nature (3.4 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.