How much does a dishwasher cost per month in Montana?

About $3.90 a month, assuming 1.20 kWh per cycle, 5 cycles a week at 14.99¢/kWh.

How many kilowatt-hours does a dishwasher use?

Roughly 312 kWh a year under these assumptions.

Is that expensive compared with other states?

Montana has the 14th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $57.13 a year.

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Cost to run a dishwasher in Montana (July 2026 rates)

At 14.99¢ per kilowatt-hour — Montana's average residential price in July 2026 — running a dishwasher costs $46.77 a year. That is 18% less than the national average of $57.13. Montana's residential rate is up 5.0% from July 2025, which moves this appliance from $44.52 to $46.77 a year.

Per cycle: 18.0¢
Per day: 12.8¢
Per month: $3.90
Per year: $46.77

Assumption: 1.20 kWh per cycle, 5 cycles a week — 312 kWh a year. Includes the machine's own water heating. Heated dry adds roughly 0.4 kWh to each cycle on top of this. Use the calculator to swap in the numbers from your own model.

How Montana compares

Montana pays 14.99¢/kWh, the 14th cheapest residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $10.36 less a year than the typical U.S. household pays for the same use. Running the same dishwasher costs $39.69 a year in Louisiana and $150 in Hawaii, so where you live changes this bill by $110 a year.

State	Rate	Per month	Per year
Mississippi	14.54¢	$3.78	$45.36
Washington	14.71¢	$3.82	$45.90
Montana	14.99¢	$3.90	$46.77
Florida	15.03¢	$3.91	$46.89
North Carolina	15.16¢	$3.94	$47.30

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

What else costs about the same in Montana

Chest freezer$44.97 a year in MT Electric oven$49.89 a year in MT Refrigerator$59.96 a year in MT

Cutting the number down

Skipping heated dry and cracking the door open is the largest single saving available on a dishwasher, and it costs nothing.
A full load uses the same energy as a half load, so waiting until it is full halves the per-dish cost.
Pre-rinsing under a hot tap usually spends more energy heating water than the machine would have used.

Questions

How much does a dishwasher cost per month in Montana?: About $3.90 a month, assuming 1.20 kWh per cycle, 5 cycles a week at 14.99¢/kWh.
How many kilowatt-hours does a dishwasher use?: Roughly 312 kWh a year under these assumptions.
Is that expensive compared with other states?: Montana has the 14th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $57.13 a year.