Propane Prices in Montana (Week of Oct 19, 2026)
Residential propane in Montana averaged $2.17 a gallon for the week of Oct 19, 2026 (+13.3% in two weeks) – 19% below the US average and the 9th lowest of 38 states EIA surveys.
Source: EIA Heating Oil and Propane Update (weekly, excluding taxes). Updated automatically each week from October to March.
Cost to fill a tank in Montana
| Delivery | Gallons | Cost at $2.17/gal |
|---|---|---|
| 20 lb grill cylinder (≈4.7 gal) | 4.7 | $10.19 |
| 100 lb cylinder (≈23.6 gal) | 23.6 | $51.16 |
| 500-gallon tank, 20% → 80% | 300 | $650.40 |
| 1,000-gallon tank, 20% → 80% | 600 | $1,300.80 |
Before sales tax, delivery minimums or small-delivery fees, which vary by dealer.
Cheapest way to heat in Montana right now
| Heating system | Cost per million BTU of heat |
|---|---|
| Natural gas furnace (95%) | $9.13 |
| Heat pump (HSPF2 9, COP ≈2.6) | $16.90 |
| Propane furnace (90%) | $26.34 |
| Electric baseboard (COP 1) | $43.93 |
Using Montana's current averages for propane, natural gas and electricity (14.99¢/kWh). Prices for natural gas in Montana and electricity in Montana.
Nearby states
Frequently asked questions
What is the price of propane in Montana this week?
$2.17 per gallon on average for homes in the week of Oct 19, 2026, before taxes (EIA survey). That is 19% below the US average of $2.69, and +13.3% since Oct 5, 2026.
How much does it cost to heat with propane in Montana?
At $2.17 a gallon, 500 gallons over a winter costs about $1,084 before tax. Actual use depends on the house, insulation and winter – check your past deliveries and enter them in the calculator.
Is propane cheaper than other heat in Montana?
Per million BTU of heat, propane costs about $26.34 in Montana this week. The cheapest option at current state averages is natural gas furnace (95%) at $9.13.
Source: EIA weekly residential propane prices. Heat comparison uses typical efficiencies and EIA state averages.