Costco Gas Prices in Montana
- Regular avg
- $4.151▼ −$0.032
- Premium avg
- $4.701▼ −$0.018
- Diesel avg
- $6.044▲ +$0.015
- Stations reporting
- 5
Avg of 5 stations · per gallon · ▲▼ change since the previous day
Average price history in Montana
Last 30 days · per gallonRegular: $4.415 on Oct 2 to $4.151 on Oct 31, low $4.151, high $4.419. Premium: $5.011 on Oct 2 to $4.701 on Oct 31, low $4.701, high $5.017. Diesel: $5.949 on Oct 2 to $6.044 on Oct 31, low $5.924, high $6.044.
Costco gas in Montana today
Costco gas stations in Montana include the warehouses in Billings, Bozeman, Helena, Kalispell, and Missoula.
Today’s Regular prices span $0.100 across the 5 stations reporting, from the cheapest to the most expensive.
Costco Regular prices in Montana have eased about $0.268 over the past month, from $4.419 a month ago.
The furthest any single station moved was Bozeman, down $0.310.
- Cheapest today
- Helena — $4.099
- Most expensive today
- Kalispell — $4.199
- vs the US average
- $0.124 below, at $4.275
- Diesel
- sold at 2 of 5 stations
- Weekday opening
- 6 a.m. at all 5 stations
- Newest warehouse
- Helena — November 2006
- Oldest warehouse
- Missoula — November 1991
Montana stations by price
Cheapest first — page through to see more.
Fuel grades at Costco in Montana
All 5 Costco gas stations in Montana sell Kirkland Signature fuel, which is Top Tier certified. Diesel is sold at 2 of the 5.
| Grade | Stations | Avg today | Cheapest |
|---|---|---|---|
| Regular | 5 | $4.151 | Helena $4.099 |
| Premium | 5 | $4.701 | Kalispell $4.649 |
| Diesel | 2 | $6.044 | Billings $5.959 |
Regular
all 5 stations87-octane Kirkland Signature unleaded, the grade most cars are built for.
- Same TOP TIER detergent package as premium. The only difference between the two is octane.
- Can contain up to 10% ethanol, like most US gasoline. The pump label shows the blend.
Premium
all 5 stationsKirkland Signature premium: 91 octane at most stations, 93 in some regions.
- Only needed if your owner’s manual requires or recommends premium. Higher octane resists engine knock; it adds nothing to an engine built for regular.
- Carries the same detergent additives as regular.
Diesel
2 of 5 stationsKirkland Signature diesel, ultra-low-sulfur like all on-road diesel in the US.
- Costco says its diesel additives clean deposits from fuel injectors, keep new ones from forming and help reduce engine wear.
Not sold at Costco
- Mid-grade (89): Costco pumps offer regular and premium only.
- Cash sales: every Costco pump is card-only.
Is Costco gas in Montana good quality?
Costco does not sell a refiner’s brand. Every pump in Montana dispenses Costco’s own Kirkland Signature fuel, bought from major refiners and distributors in the region and finished with Costco’s additive package.
Kirkland Signature gasoline is licensed TOP TIER, the detergent standard set by automakers including GM, Ford, Toyota, Honda and BMW. Costco puts its detergent level at about five times the EPA minimum, which is what keeps intake valves and fuel injectors clear of carbon deposits. Costco’s gasoline also contains friction modifiers that it says reduce engine wear.
In short, the low price is not a lower grade. The saving comes from Costco running its gas as a membership perk on thin margins, not from the fuel.
Costco gas station hours in Montana
On weekdays the earliest pumps in Montana come on at 6 a.m. (Billings) and the last ones switch off at 10 p.m. (Billings). Pump hours run longer than the warehouse's, and weekends are shorter. Times are local.
| Station | Mon–Fri | Sat | Sun |
|---|---|---|---|
| Billings | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Bozeman | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Helena | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Kalispell | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Missoula | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
What else is at Costco warehouses in Montana
Every Costco gas station sits in a warehouse parking lot, so a fill-up can share a trip with the rest of the list.
- Food court
- 5 of 5
- Pharmacy
- 5 of 5
- Optical
- 5 of 5
- Tire center
- 5 of 5
- Car wash
- 0 of 5
- EV charging
- 0 of 5
How Costco gas works in Montana
Bring your card. The pump asks for an active Costco membership card before it starts, at all 5 gas stations in Montana. Without a membership, a Costco Shop Card loaded with credit works the same way.
Pay by card. The pumps take Visa, most debit cards and the Costco Shop Card. There is no cash, and a card hold of up to $150 can show until the fill posts.
Check the price first. Each station sets its own price, usually once a day, so two Costco stations in Montana can differ. Today the regular average here is $4.151. The prices on this page are collected once daily and can lag a same-day change at the pump.
Go early or late. Lines are longest on weekend afternoons and weekday evenings. The first pumps here open at 6 a.m. on weekdays.
Montana prices by city
States near Montana
- Costco gas prices Idaho · 7 stations$4.220
- Costco gas prices Utah · 16 stations$4.283
- Costco gas prices Washington · 34 stations$4.680
- Costco gas prices Oregon · 13 stations$4.442
- Costco gas prices Colorado · 15 stations$3.835
- Costco gas prices North Dakota · 2 stations$3.799
Costco gas in Montana: common questions
Where is the cheapest Costco gas in Montana today?
Helena posts the lowest Regular price in Montana, $4.099 as of the October 31, 2026 reading — $0.100 under Kalispell, the most expensive of the 5 stations reporting.
How many Costco gas stations are there in Montana?
Montana has 5 Costco warehouses with a gas station, across 5 cities, and all of them reported a price in the last 30 days.
Which Costco gas stations in Montana sell diesel?
Diesel is sold at 2 of 5 stations in Montana. Each station page lists the grades that warehouse has actually posted a price for in the last 30 days.
Is Costco gas cheaper in Montana than in the US?
Yes — the average Costco Regular price in Montana is $4.151, $0.124 below the US average of $4.275 as of the October 31, 2026 reading.
Are Costco gas prices in Montana going up or down?
Down — the average Costco Regular price in Montana has eased about $0.268 over the past month, from $4.419 to $4.151.
What time do Costco gas stations in Montana open?
The pumps open at 6 a.m. on weekdays at all 5 stations, ahead of the warehouse doors. Each station page carries its own full week, in local time.