Pool swim season in Midvale, UT
When can you swim in an outdoor pool in Midvale, UT?
An unheated pool in Midvale reaches 78°F in Jul to Aug, about 2 months a year. The air allows up to 5 swimmable months with a heater (May to Sep).
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Heater options for a Midvale pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 2 | Jul to Aug | $0 | $0 |
| Solar cover only | 3 | Jul to Sep | $0 | $50 |
| Solar panels + cover | 4 | Jun to Sep | $0 | $283 |
| Heat pump + cover | 5 | May to Sep | $163 | $713 |
| Gas heater + cover | 5 | May to Sep | $240 | $665 |
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 Midvale
Solar panels + cover: 4 of 5 possible months for about $283 a year all-in, which works out near $142 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 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: Cottonwood Weir, 5.7 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Midvale month by month: air, sun and pool water
| Month | Air high | Air avg | Sun kWh/m²/day | Water, unheated | Water, covered | Heat pump $ | Gas $ |
|---|---|---|---|---|---|---|---|
| Jan | 38° | 30° | 2.3 | 30° | 36° | – | – |
| Feb | 44° | 36° | 3.2 | 33° | 39° | – | – |
| Mar | 54° | 44° | 4.5 | 41° | 47° | – | – |
| Apr | 61° | 50° | 5.6 | 50° | 56° | – | – |
| May | 71° | 59° | 6.6 | 58° | 64° | $129 | $185 |
| Jun | 82° | 70° | 7.8 | 69° | 75° | $34 | $55 |
| Jul | 91° | 79° | 7.5 | 79° | 85° | – | – |
| Aug | 89° | 77° | 6.6 | 82° | 88° | – | – |
| Sep | 79° | 68° | 5.4 | 75° | 81° | – | – |
| Oct | 64° | 54° | 3.8 | 62° | 68° | – | – |
| Nov | 49° | 40° | 2.5 | 47° | 53° | – | – |
| Dec | 38° | 31° | 1.9 | 34° | 40° | – | – |
Heating costs most in May (about $129 with a heat pump, $185 with gas). Sunshine peaks in Jun at 7.8 kWh/m²/day (NASA satellite data, 35.6 km grid cell). Highlighted months are swimmable with no heater.
How Midvale compares with nearby cities
Midvale ranks 19 of 67 Utah cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Murray, UT | 3 mi | 2 | 5 | $163 |
| Sandy, UT | 4 mi | 2 | 5 | $163 |
| Cottonwood Heights, UT | 4 mi | 2 | 5 | $163 |
| Taylorsville, UT | 4 mi | 2 | 5 | $128 |
| Holladay, UT | 5 mi | 2 | 5 | $163 |
| West Jordan, UT | 6 mi | 2 | 5 | $129 |