How much does a string of Christmas lights cost per month in Montana?

About 8.5¢ a month, assuming 25 W, 6 hours a day, 45 days a year at 15.14¢/kWh.

How many kilowatt-hours does a string of Christmas lights use?

Roughly 7 kWh a year under these assumptions, or 0.03 kWh for every hour it runs.

Is that expensive compared with other states?

Montana has the 16th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $1.24 a year.

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Cost to run a string of Christmas lights in Montana (June 2026 rates)

At 15.14¢ per kilowatt-hour — Montana's average residential price in June 2026 — running a string of Christmas lights costs $1.02 a year. That is 17% less than the national average of $1.24. Montana's residential rate is up 2.2% from June 2025, which moves this appliance from 100.0¢ to $1.02 a year.

Per hour: 0.4¢
Per day of use: 2.3¢
Per month: 8.5¢
Per year: $1.02

Assumption: 25 W, 6 hours a day, 45 days a year — 7 kWh a year. Per 100-count LED string. A 100-count incandescent string draws roughly 40 W, and older C9 bulbs far more. Use the calculator to swap in the numbers from your own model.

How Montana compares

Montana pays 15.14¢/kWh, the 16th cheapest residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to 21.6¢ less a year than the typical U.S. household pays for the same use. Running the same string of Christmas lights costs 88.5¢ a year in Nevada and $3.56 in Hawaii, so where you live changes this bill by $2.67 a year.

State	Rate	Per month	Per year
New Mexico	15.06¢	8.5¢	$1.02
Florida	15.10¢	8.5¢	$1.02
Montana	15.14¢	8.5¢	$1.02
Arizona	15.18¢	8.5¢	$1.02
Wyoming	15.24¢	8.6¢	$1.03

States ranked by average residential price, cheapest first. See all 51 states for a string of Christmas lights.

What else costs about the same in Montana

Led bulb$2.49 a year in MT Clothes iron$2.50 a year in MT Smart speaker$3.98 a year in MT

Cutting the number down

A timer that runs the display six hours instead of twelve halves the season's cost with nobody noticing.
Incandescent strings are where holiday bills come from; LED strings of the same length are a fraction of the draw.

Questions

How much does a string of Christmas lights cost per month in Montana?: About 8.5¢ a month, assuming 25 W, 6 hours a day, 45 days a year at 15.14¢/kWh.
How many kilowatt-hours does a string of Christmas lights use?: Roughly 7 kWh a year under these assumptions, or 0.03 kWh for every hour it runs.
Is that expensive compared with other states?: Montana has the 16th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $1.24 a year.