Pool season · Tennessee
Chattanooga Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
This is the one-page view of Chattanooga'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.
Chattanooga, TN — 142 swim days a yearEach dot on the bar is one week of Chattanooga's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (March 23–April 13), solid teal is swim season, and hollow amber is the closing window ending October 30. The black marker is today — its position against the colors is the entire executive summary.
The Chattanooga pool calendar
Opening — target March 30
Target March 30; the practical window runs March 23–April 13, and the 7-day mean crosses the 61°F threshold around April 13. Cold-water starts are the cheap ones.
Closing — deadline October 30
The window opens October 20 once water leaves the algae zone; the model deadline is October 30, a week ahead of the November 9 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Chattanooga'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 42° | 43° | 50° | 58° | 66° | 74° | 80° | 81° | 77° | 68° | 56° | 47° |
Warmest water typically July–August (peaking near 81°F); heaters and covers shift any month up.
Every station tells its own story: compare this curve with Bristol's pool season and Clarksville's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Tennessee season index.
Chattanooga pool season FAQ
When should I open my pool in Chattanooga, TN?
Open by March 30 — the model places Chattanooga's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The Chattanooga opening guide has the 12-step sequence.
When should I close my pool in Chattanooga?
Close by October 30: cool water keeps its winter chemistry, but freeze damage is the hard stop. The Chattanooga closing guide sequences the work backward from that date.
How long is the swim season in Chattanooga?
Chattanooga averages 142 days a year with normal highs of 80°F or better — about 10 days earlier than the Tennessee median. The Tennessee season index ranks all 14 covered cities by the same metric.
How warm does pool water get in Chattanooga?
An unheated pool near Chattanooga typically peaks around 81°F in high summer and bottoms out near 42°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 Chattanooga hits the closing window
Data: NOAA 1991–2020 climate normals via Chattanooga Lovell Airport (3.6 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.