Pool season · New Mexico
Las Cruces Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
One bar, one year, one Las Cruces 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.
Las Cruces, NM — 175 swim days a yearEach dot on the bar is one week of Las Cruces'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 November 2. The black marker is today — its position against the colors is the entire executive summary.
The Las Cruces pool calendar
Opening — target March 28
Target March 28; the practical window runs March 21–April 11, and the 7-day mean crosses the 61°F threshold around April 11. Cold-water starts are the cheap ones.
Closing — deadline November 2
The window opens October 23 once water leaves the algae zone; the model deadline is November 2, a week ahead of the November 13 freeze normal.
Estimated water temperature by month
This is Las Cruces's typical-year water curve: the same EWMA model as the live widget, run on the 1991–2020 normals instead of this week's weather.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 43° | 46° | 52° | 59° | 66° | 76° | 82° | 82° | 78° | 69° | 58° | 47° |
Warmest water typically July–September (peaking near 82°F); heaters and covers shift any month up.
Every station tells its own story: compare this curve with Albuquerque's pool season and Rio Rancho's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the New Mexico season index.
Las Cruces pool season FAQ
When should I open my pool in Las Cruces, NM?
Open by March 28 — the model places Las Cruces's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The Las Cruces opening guide has the 12-step sequence.
When should I close my pool in Las Cruces?
Close by November 2: cool water keeps its winter chemistry, but freeze damage is the hard stop. The Las Cruces closing guide sequences the work backward from that date.
How long is the swim season in Las Cruces?
Las Cruces averages 175 days a year with normal highs of 80°F or better — about 25 days earlier than the New Mexico median. The New Mexico season index ranks all 4 covered cities by the same metric.
How warm does pool water get in Las Cruces?
An unheated pool near Las Cruces typically peaks around 82°F in high summer and bottoms out near 43°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 Las Cruces hits the closing window
Data: NOAA 1991–2020 climate normals via State University (3.5 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.