Pool season · Nevada
Henderson Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
One bar, one year, one Henderson 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.
Henderson, NV — 180 swim days a yearReading it takes ten seconds: 52 dots, one per week. Solid teal is Henderson's swim season; the hollow teal run before it (February 24 to March 17) is when to open; the hollow amber run after is when to close, with November 16 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Henderson pool calendar
Opening — target March 3
Open by March 3 — a two-week head start on the March 17 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 16
The window opens November 6 once water leaves the algae zone; the model deadline is November 16, a week ahead of the December 15 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Henderson'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 48° | 51° | 57° | 65° | 73° | 83° | 91° | 93° | 88° | 77° | 63° | 51° |
Warmest water typically June–September (peaking near 94°F); heaters and covers shift any month up.
Every station tells its own story: compare this curve with Enterprise's pool season and Las Vegas's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Nevada season index.
Henderson pool season FAQ
When should I open my pool in Henderson, NV?
The site model recommends opening by March 3 — about two weeks before Henderson'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 Henderson opening guide.
When should I close my pool in Henderson?
Winterize by November 16. The model holds the deadline a week ahead of Henderson's NOAA 50% first-freeze date, so the plumbing is protected before the first hard night. The full sequence is in the Henderson closing guide.
How long is the swim season in Henderson?
Henderson averages 180 days a year with normal highs of 80°F or better — about 4 days earlier than the Nevada median. The Nevada season index ranks all 9 covered cities by the same metric.
How warm does pool water get in Henderson?
An unheated pool near Henderson typically peaks around 94°F in high summer and bottoms out near 48°F in winter, spending roughly 4 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 Henderson hits the closing window
Data: NOAA 1991–2020 climate normals via Las Vegas Mccarran Airport (8.1 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.