Pool swim season in Roseburg, OR
Swim season in Roseburg without a heater, and with one
An unheated pool in Roseburg never reaches 78°F in a normal year. It peaks around 75°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 Roseburg
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 0 | no month | $0 | $0 |
| Solar cover only | 2 | Jul to Aug | $0 | $50 |
| Solar panels + cover | 4 | Jun to Sep | $0 | $283 |
| Heat pump + cover | 5 | May to Sep | $262 | $812 |
| Gas heater + cover | 5 | May to Sep | $549 | $974 |
For a 450 sq ft pool held at 80°F, at OR prices of 15.5¢/kWh electricity and $17/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Roseburg
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 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: Roseburg Regional Airport, 0.7 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Roseburg 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 | 50° | 44° | 1.5 | 42° | 48° | – | – |
| Feb | 54° | 46° | 2.3 | 44° | 50° | – | – |
| Mar | 59° | 49° | 3.4 | 48° | 54° | – | – |
| Apr | 63° | 53° | 4.7 | 53° | 59° | – | – |
| May | 71° | 60° | 5.9 | 59° | 65° | $144 | $289 |
| Jun | 77° | 65° | 6.6 | 66° | 72° | $75 | $162 |
| Jul | 86° | 72° | 7.3 | 72° | 78° | $13 | $31 |
| Aug | 86° | 72° | 6.3 | 75° | 81° | – | – |
| Sep | 80° | 66° | 4.8 | 71° | 77° | $30 | $67 |
| Oct | 67° | 56° | 3.0 | 61° | 67° | – | – |
| Nov | 54° | 47° | 1.6 | 50° | 56° | – | – |
| Dec | 48° | 43° | 1.2 | 43° | 49° | – | – |
Heating costs most in May (about $144 with a heat pump, $289 with gas). Sunshine peaks in Jul at 7.3 kWh/m²/day (NASA satellite data, 33.0 km grid cell). Highlighted months are swimmable with no heater.
How Roseburg compares with nearby cities
Roseburg ranks 8 of 57 Oregon cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Cottage Grove, OR | 42 mi | 0 | 4 | $286 |
| Coos Bay, OR | 46 mi | 0 | 0 | $0 |
| North Bend, OR | 46 mi | 0 | 0 | $0 |
| Grants Pass, OR | 55 mi | 0 | 5 | $217 |
| Eugene, OR | 59 mi | 0 | 4 | $254 |
| Springfield, OR | 60 mi | 0 | 4 | $247 |