How much does a hot tub cost per month in Montana?

About $32.44 a month, assuming 2,500 kWh a year at 15.57¢/kWh.

How many kilowatt-hours does a hot tub use?

Roughly 2,500 kWh a year under these assumptions.

Is that expensive compared with other states?

Montana has the 19th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $454 a year.

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Cost to run a hot tub in Montana (August 2026 rates)

At 15.57¢ per kilowatt-hour — Montana's average residential price in August 2026 — running a hot tub costs $389 a year. That is 14% less than the national average of $454. Montana's residential rate is up 9.0% from August 2025, which moves this appliance from $357 to $389 a year.

Per day: $1.07
Per month: $32.44
Per year: $389

Assumption: 2,500 kWh a year. A well-insulated 400-gallon tub held at 100 F year-round in a moderate climate. A poorly insulated tub in a cold climate can double this. Use the calculator to swap in the numbers from your own model.

How Montana compares

Montana pays 15.57¢/kWh, the 19th cheapest residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $64.75 less a year than the typical U.S. household pays for the same use. Running the same hot tub costs $318 a year in Nevada and $1,180 in Hawaii, so where you live changes this bill by $862 a year.

State	Rate	Per month	Per year
South Dakota	15.15¢	$31.56	$379
Kansas	15.47¢	$32.23	$387
Montana	15.57¢	$32.44	$389
South Carolina	15.76¢	$32.83	$394
Georgia	15.90¢	$33.12	$398

States ranked by average residential price, cheapest first. See all 51 states for a hot tub.

What else costs about the same in Montana

Central air conditioner$366 a year in MT Heat pump$336 a year in MT Pool pump$269 a year in MT

Cutting the number down

A good cover is the whole ballgame. Most of the energy replaces heat lost from the surface, not heat delivered to people.
Holding temperature usually beats cooling down and reheating, because reheating a large mass of water is expensive.
A waterlogged cover has lost its insulation value and quietly doubles the standing loss.

Questions

How much does a hot tub cost per month in Montana?: About $32.44 a month, assuming 2,500 kWh a year at 15.57¢/kWh.
How many kilowatt-hours does a hot tub use?: Roughly 2,500 kWh a year under these assumptions.
Is that expensive compared with other states?: Montana has the 19th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $454 a year.