Pool season · Tennessee
Jackson Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
One bar, one year, one Jackson pool. The season bar below draws everything the model knows — opening window, prime season, closing window — against today's date, with the working details one click away on the opening and closing pages.
Jackson, TN — 139 swim days a yearEach dot on the bar is one week of Jackson'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 29–April 19), solid teal is swim season, and hollow amber is the closing window ending October 22. The black marker is today — its position against the colors is the entire executive summary.
The Jackson pool calendar
Opening — target April 5
Open by April 5 — a two-week head start on the April 19 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 22
The window opens October 15 once water leaves the algae zone; the model deadline is October 22, a week ahead of the October 29 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Jackson'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° | 65° | 74° | 79° | 80° | 76° | 67° | 54° | 45° |
Warmest water typically July–August (peaking near 80°F); heaters and covers shift any month up.
Every station tells its own story: compare this curve with Franklin's pool season and Johnson City's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Tennessee season index.
Jackson pool season FAQ
When should I open my pool in Jackson, TN?
The site model recommends opening by April 5 — about two weeks before Jackson'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 Jackson opening guide.
When should I close my pool in Jackson?
Winterize by October 22. The model holds the deadline a week ahead of Jackson's NOAA 50% first-freeze date, so the plumbing is protected before the first hard night. The full sequence is in the Jackson closing guide.
How long is the swim season in Jackson?
Jackson averages 139 days a year with normal highs of 80°F or better — about 4 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 Jackson?
An unheated pool near Jackson typically peaks around 80°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 Jackson hits the closing window
Data: NOAA 1991–2020 climate normals via Jackson Experiment Station (2.3 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.