Pool swim season in Cheyenne, WY
When can you swim in an outdoor pool in Cheyenne, WY?
An unheated pool in Cheyenne never reaches 78°F in a normal year. It peaks around 72°F in Aug. The air allows up to 4 swimmable months with a heater (Jun to Sep).
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What each heater buys you in Cheyenne
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 0 | no month | $0 | $0 |
| Solar cover only | 0 | no month | $0 | $50 |
| Solar panels + cover | 4 | Jun to Sep | $0 | $283 |
| Heat pump + cover | 4 | Jun to Sep | $236 | $786 |
| Gas heater + cover | 4 | Jun to Sep | $383 | $808 |
For a 450 sq ft pool held at 80°F, at WY prices of 14.0¢/kWh electricity and $12/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Cheyenne
Solar panels + cover: 4 of 4 possible months for about $283 a year all-in, which works out near $71 for each month it adds.
A solar cover alone adds no swim months here, so if you want a longer season you need a heater (why); still use one at night to hold the heat you pay for. 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: Cheyenne NWS Office, 1.7 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Cheyenne 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 | 41° | 29° | 2.3 | 28° | 34° | – | – |
| Feb | 41° | 29° | 3.2 | 30° | 36° | – | – |
| Mar | 49° | 37° | 4.5 | 35° | 41° | – | – |
| Apr | 55° | 42° | 5.4 | 42° | 48° | – | – |
| May | 64° | 52° | 6.1 | 50° | 56° | – | – |
| Jun | 76° | 63° | 7.1 | 61° | 67° | $106 | $172 |
| Jul | 83° | 69° | 6.9 | 70° | 76° | $32 | $57 |
| Aug | 81° | 67° | 6.1 | 72° | 78° | $20 | $34 |
| Sep | 73° | 59° | 5.0 | 65° | 71° | $78 | $120 |
| Oct | 59° | 46° | 3.6 | 53° | 59° | – | – |
| Nov | 48° | 36° | 2.5 | 41° | 47° | – | – |
| Dec | 40° | 29° | 2.0 | 31° | 37° | – | – |
Heating costs most in Jun (about $106 with a heat pump, $172 with gas). Sunshine peaks in Jun at 7.1 kWh/m²/day (NASA satellite data, 48.3 km grid cell). Highlighted months are swimmable with no heater.
How Cheyenne compares with nearby cities
Cheyenne ranks 8 of 11 Wyoming cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Wellington, CO | 32 mi | 0 | 4 | $146 |
| Timnath, CO | 42 mi | 0 | 4 | $138 |
| Fort Collins, CO | 42 mi | 0 | 5 | $318 |
| Severance, CO | 43 mi | 0 | 4 | $138 |
| Laramie, WY | 44 mi | 0 | 4 | $452 |
| Windsor, CO | 45 mi | 0 | 4 | $138 |