Pool swim season in Grantsville, UT

Swim season in Grantsville without a heater, and with one

An unheated pool in Grantsville reaches 78°F in Aug, about 1 month a year. The air allows up to 5 swimmable months with a heater (May to Sep).

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 Grantsville pool, side by side

For a 450 sq ft pool held at 80°F, at UT prices of 13.2¢/kWh electricity and $10/Mcf gas. All-in spreads the purchase over the equipment's life.

The cheapest way to the full season in Grantsville

Solar panels + cover: 4 of 5 possible months for about $283 a year all-in, which works out near $94 for each month it adds.

Before you pay for any heater, buy a solar cover: on its own it adds 2 months here for about $50 a year (why a cover comes first). If you get quotes, ask for gas as well as a heat pump: once the purchase price is counted, gas comes out cheaper all-in here (heat pump or gas).

Weather station: Grantsville 2W, 2.1 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.

Grantsville month by month: air, sun and pool water

Heating costs most in May (about $146 with a heat pump, $205 with gas). Sunshine peaks in Jun at 7.8 kWh/m²/day (NASA satellite data, 12.6 km grid cell). Highlighted months are swimmable with no heater.

How Grantsville compares with nearby cities

Grantsville ranks 39 of 67 Utah cities for unheated swim months; Magna, Kearns, West Jordan nearby get a longer season without a heater.