Pool season · Arkansas
Fort Smith Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
Fort Smith'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.
Fort Smith, AR — 148 swim days a yearEach dot on the bar is one week of Fort Smith'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 21–April 11), 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 Fort Smith pool calendar
Opening — target March 28
Open by March 28 — a two-week head start on the April 11 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 30
Hold the cover until October 22, then winterize by October 30, a week ahead of the November 6 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Fort Smith'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 41° | 42° | 50° | 59° | 67° | 75° | 82° | 83° | 79° | 69° | 57° | 47° |
Warmest water typically July–September (peaking near 84°F); heaters and covers shift any month up.
Every station tells its own story: compare this curve with Fayetteville's pool season and Jonesboro's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Arkansas season index.
Fort Smith pool season FAQ
When should I open my pool in Fort Smith, AR?
The site model recommends opening by March 28 — about two weeks before Fort Smith'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 Fort Smith opening guide.
When should I close my pool in Fort Smith?
Winterize by October 30. The model holds the deadline a week ahead of Fort Smith's NOAA 50% first-freeze date, so the plumbing is protected before the first hard night. The full sequence is in the Fort Smith closing guide.
How long is the swim season in Fort Smith?
Fort Smith averages 148 days a year with normal highs of 80°F or better — about 10 days earlier than the Arkansas median. The Arkansas season index ranks all 7 covered cities by the same metric.
How warm does pool water get in Fort Smith?
An unheated pool near Fort Smith typically peaks around 84°F in high summer and bottoms out near 40°F in winter, spending roughly 3 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 Fort Smith hits the closing window
Data: NOAA 1991–2020 climate normals via Ft Smith Regional Airport (1.2 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.