Natural Gas Price in Idaho (2025)
Natural gas in Idaho costs $0.74 per therm on average for homes ($7.69 per Mcf, 2025) – 50% below the US average and the 1st cheapest of 51 states and DC. The average customer's bill works out to about $45 a month over the year.
Source: EIA annual residential price (2025) and residential use per customer (2024). Latest monthly figure: $1.28/therm in July 2026 (monthly prices swing with the season).
Gas bill in Idaho by usage
| Monthly use | Idaho | At US average |
|---|---|---|
| 30 therms (29 ccf) | $22.25 | $44.38 |
| 60 therms (58 ccf) | $44.49 | $88.76 |
| 100 therms (96 ccf) | $74.16 | $147.93 |
| 150 therms (145 ccf) | $111.23 | $221.89 |
Average price includes delivery and fixed charges spread over all gas sold. Roughly: 30 therms is a summer month with a gas water heater and stove; 100–150 therms is a cold-climate winter month with gas heat.
Price trend
Idaho's average residential price fell from $8.51 per Mcf in 2024 to $7.69 in 2025 (−9.6%). Nationally it went from $14.50 to $15.34.
Gas vs electricity in Idaho
One therm of gas holds the same energy as 29.3 kWh of electricity. At Idaho's 13.73¢/kWh, that much electricity costs $4.02 versus $0.74 for the gas. Gas furnaces turn 80–97% of that into heat, while a heat pump delivers 2–3 times the electricity it uses. Run your own numbers with the heat pump vs furnace calculator, and see electricity cost in Idaho.
How Idaho compares
- Montana: $0.87/therm, about $53/month
- North Dakota: $0.92/therm, about $58/month
- US average: $1.48/therm, about $76/month.
Other Mountain states: Montana ($0.87), New Mexico ($0.95), Utah ($0.98), Colorado ($1.08), Wyoming ($1.13), Nevada ($1.27), Arizona ($1.79).
Frequently asked questions
How much is natural gas per therm in Idaho?
Idaho residential customers paid an average of $0.74 per therm in 2025 ($7.69 per thousand cubic feet), including delivery charges. That is 50% below the US average of $1.48 and ranks 1st cheapest of 51.
What is the average gas bill in Idaho?
The average Idaho gas customer used about 69.7 Mcf (723 therms) a year in 2024, which works out to about $45 a month at 2025 prices, averaged over the year. Winter bills are much higher than summer bills.
Has natural gas gone up in Idaho?
The average price fell from $8.51 per Mcf in 2024 to $7.69 in 2025 (−9.6%).
Is gas or electric heat cheaper in Idaho?
Per unit of energy, gas at $0.74/therm compares with $4.02 for the same energy from electricity at 13.73¢/kWh. A heat pump delivers 2–3 units of heat per unit of electricity, so it can still beat gas – compare with your numbers in the heat pump vs furnace calculator.
Sources: EIA natural gas prices; EIA residential deliveries; EIA number of consumers.