Pool swim season in Eagle Mountain, UT
Eagle Mountain, UT: how long the pool season really is
An unheated pool in Eagle Mountain never reaches 78°F in a normal year. It peaks around 73°F in Aug. The air allows up to 5 swimmable months with a heater (May to Sep).
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What each heater buys you in Eagle Mountain
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 0 | no month | $0 | $0 |
| Solar cover only | 1 | Aug | $0 | $50 |
| Solar panels + cover | 4 | Jun to Sep | $0 | $283 |
| Heat pump + cover | 5 | May to Sep | $337 | $887 |
| Gas heater + cover | 5 | May to Sep | $478 | $903 |
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 Eagle Mountain
Solar panels + cover: 4 of 5 possible months for about $283 a year all-in, which works out near $71 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: Fairfield, 5.5 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Eagle Mountain 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 | 39° | 26° | 2.1 | 26° | 32° | – | – |
| Feb | 45° | 31° | 3.1 | 29° | 35° | – | – |
| Mar | 56° | 40° | 4.4 | 37° | 43° | – | – |
| Apr | 63° | 46° | 5.7 | 46° | 52° | – | – |
| May | 72° | 54° | 6.8 | 54° | 60° | $176 | $235 |
| Jun | 83° | 63° | 7.8 | 64° | 70° | $81 | $123 |
| Jul | 90° | 71° | 7.4 | 71° | 77° | $19 | $31 |
| Aug | 89° | 69° | 6.6 | 73° | 79° | $4 | $7 |
| Sep | 80° | 60° | 5.4 | 67° | 73° | $57 | $82 |
| Oct | 67° | 48° | 3.9 | 55° | 61° | – | – |
| Nov | 52° | 36° | 2.5 | 41° | 47° | – | – |
| Dec | 40° | 27° | 1.8 | 30° | 36° | – | – |
Heating costs most in May (about $176 with a heat pump, $235 with gas). Sunshine peaks in Jun at 7.8 kWh/m²/day (NASA satellite data, 46.2 km grid cell). Highlighted months are swimmable with no heater.
How Eagle Mountain compares with nearby cities
Eagle Mountain ranks 66 of 67 Utah cities for unheated swim months; Saratoga Springs, Lehi, Bluffdale nearby get a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Saratoga Springs, UT | 5 mi | 1 | 5 | $221 |
| Lehi, UT | 10 mi | 1 | 5 | $221 |
| Bluffdale, UT | 12 mi | 2 | 5 | $130 |
| American Fork, UT | 12 mi | 2 | 5 | $134 |
| Herriman, UT | 12 mi | 2 | 5 | $129 |
| Vineyard, UT | 14 mi | 2 | 5 | $139 |