Pool swim season in Twentynine Palms, CA

When can you swim in an outdoor pool in Twentynine Palms, CA?

An unheated pool in Twentynine Palms reaches 78°F in Jun to Oct, about 5 months a year. The air allows up to 9 swimmable months with a heater (Mar to Nov).

1. J
2. F
3. M
4. A
5. M
6. J
7. J
8. A
9. S
10. O
11. N
12. D

Heater options for a Twentynine Palms pool, side by side

For a 450 sq ft pool held at 80°F, at CA prices of 32.6¢/kWh electricity and $22/Mcf gas. All-in spreads the purchase over the equipment's life.

The cheapest way to the full season in Twentynine Palms

Heat pump + cover: 9 of 9 possible months for about $1,050 a year all-in, which works out near $263 for each month it adds.

Before you pay for any heater, buy a solar cover: on its own it adds 1 month here for about $50 a year (why a cover comes first). If you get quotes, ask for a heat pump sized to your pool's surface area; here it beats gas all-in (heat pump or gas).

Weather station: Twentynine Palms, 2.1 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.

Twentynine Palms month by month: air, sun and pool water

Heating costs most in Mar (about $245 with a heat pump, $318 with gas). Sunshine peaks in Jun at 8.5 kWh/m²/day (NASA satellite data, 55.9 km grid cell). Highlighted months are swimmable with no heater.

How Twentynine Palms compares with nearby cities

Twentynine Palms ranks 13 of 376 California cities for unheated swim months; Indio, Cathedral City, Coachella nearby get a longer season without a heater.