Pool closing · State guide
When to Close Your Pool in New Mexico
Last updated: July 25, 2026 · 4 cities covered
Closing deadlines across New Mexico stretch about 34 days: Santa Fe needs the cover on first (September 29), Las Cruces last (November 2), and the statewide median deadline is October 17.
Each deadline is the model's two-clock compromise — ten days after the water leaves the algae zone, capped a week before the local 50% first-freeze date. City pages carry the live widget that flags early-freeze years and the full winterizing sequence.
| City | Window opens | Close by | First freeze (50%) |
|---|---|---|---|
| Albuquerque | Oct 6 | Oct 13 | Oct 20 |
| Las Cruces | Oct 23 | Nov 2 | Nov 13 |
| Rio Rancho | Oct 11 | Oct 21 | Nov 1 |
| Santa Fe | Sep 19 | Sep 29 | Oct 6 |
Dates are typical-year model outputs, not forecasts — each city guide carries the live widget that tracks the current year against them.
How to use these dates
Each "close by" deadline is the model's two-clock compromise for that city: ten days after its 7-day mean temperature falls back through 61°F (water goes algae-dormant soon after), but never later than a week before its 50% first-freeze date from the NOAA 1991–2020 normals. Closing inside the window seals cold, stable water under the cover; closing early seals a warm algae incubator instead.
Treat the dates as typical-year guidance, not forecasts. An early cold snap moves the real deadline — each city guide runs a live water-temperature widget that flags a 32°F night inside the 10-day forecast as urgent, and carries the full winterizing checklist in working order.
What drives New Mexico's closing deadlines
High-desert sunshine is abundant, but elevation rules the calendar: southern lowland pools run long seasons while Albuquerque, Santa Fe, and mountain towns face chilly nights. Las Cruces holds the state's latest deadline (November 2), and the New Mexico season index lists every other city's.