Pool swim season in Arlington, TX
When can you swim in an outdoor pool in Arlington, TX?
An unheated pool in Arlington reaches 78°F in Jun to Sep, about 4 months a year. The air allows up to 7 swimmable months with a heater (Apr to Oct).
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Heater options for a Arlington pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 4 | Jun to Sep | $0 | $0 |
| Solar cover only | 6 | May to Oct | $0 | $50 |
| Solar panels + cover | 7 | Apr to Oct | $0 | $283 |
| Heat pump + cover | 7 | Apr to Oct | $92 | $642 |
| Gas heater + cover | 7 | Apr to Oct | $229 | $654 |
For a 450 sq ft pool held at 80°F, at TX prices of 16.0¢/kWh electricity and $19/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Arlington
Solar cover only: 6 of 7 possible months for about $50 a year all-in, which works out near $25 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 a heat pump sized to your pool's surface area; here it beats gas all-in (heat pump or gas).
Weather station: Arlington Municipal Airport, 3.4 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Arlington 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 | 58° | 47° | 3.0 | 48° | 54° | – | – |
| Feb | 62° | 51° | 3.5 | 50° | 56° | – | – |
| Mar | 70° | 59° | 4.6 | 57° | 63° | – | – |
| Apr | 77° | 66° | 5.6 | 65° | 71° | $83 | $205 |
| May | 84° | 74° | 6.0 | 73° | 79° | $9 | $24 |
| Jun | 92° | 82° | 6.8 | 82° | 88° | – | – |
| Jul | 96° | 85° | 6.9 | 88° | 94° | – | – |
| Aug | 96° | 86° | 6.3 | 89° | 95° | – | – |
| Sep | 89° | 79° | 5.2 | 84° | 90° | – | – |
| Oct | 79° | 68° | 4.2 | 74° | 80° | – | – |
| Nov | 67° | 57° | 3.2 | 63° | 69° | – | – |
| Dec | 59° | 49° | 2.7 | 53° | 59° | – | – |
Heating costs most in Apr (about $83 with a heat pump, $205 with gas). Sunshine peaks in Jul at 6.9 kWh/m²/day (NASA satellite data, 41.6 km grid cell). Highlighted months are swimmable with no heater.
How Arlington compares with nearby cities
Arlington ranks 69 of 252 Texas cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Grand Prairie, TX | 6 mi | 4 | 7 | $120 |
| Kennedale, TX | 7 mi | 4 | 7 | $92 |
| Forest Hill, TX | 9 mi | 4 | 7 | $92 |
| Mansfield, TX | 9 mi | 4 | 7 | $92 |
| Hurst, TX | 10 mi | 4 | 7 | $131 |
| Bedford, TX | 10 mi | 4 | 7 | $138 |