Costco Gas Prices in Idaho
- Regular avg
- $4.220▼ −$0.077
- Premium avg
- $4.783▼ −$0.024
- Diesel avg
- $6.324
- Stations reporting
- 7
Avg of 7 stations · per gallon · ▲▼ change since the previous day
Average price history in Idaho
Last 30 days · per gallonRegular: $4.836 on Oct 2 to $4.220 on Oct 31, low $4.220, high $4.848. Premium: $5.332 on Oct 2 to $4.783 on Oct 31, low $4.783, high $5.340. Diesel: $6.109 on Oct 2 to $6.324 on Oct 31, low $5.949, high $6.324.
Costco gas in Idaho today
Costco gas stations in Idaho include the warehouses in Boise, Coeur d'Alene, Idaho Falls, Meridian, Nampa, Pocatello, and Twin Falls.
Today’s Regular prices span $0.340 across the 7 stations reporting, from the cheapest to the most expensive.
Costco Regular prices in Idaho have eased about $0.620 over the past month, from $4.840 a month ago.
The furthest any single station moved was Twin Falls, down $0.900.
- Cheapest today
- Coeur d Alene — $3.959
- Most expensive today
- Nampa — $4.299
- vs the US average
- $0.055 below, at $4.275
- Diesel
- sold at 2 of 7 stations
- Car wash
- Boise
- Weekday opening
- 6 a.m. at all 7 stations
- Newest warehouse
- Meridian — October 2020
- Oldest warehouse
- Boise — October 1988
Idaho stations by price
Cheapest first — page through to see more.
| Rank | Station | Location | Regular today |
|---|---|---|---|
| 1 | Coeur d AleneCoeur d'Alene | Coeur d'Alene | $3.959 |
| 2 | Twin FallsTwin Falls | Twin Falls | $4.099 |
| 3 | PocatelloPocatello | Pocatello | $4.289 |
| 4 | BoiseBoise | Boise | $4.299 |
| 5 | NampaNampa | Nampa | $4.299 |
| 6 | Idaho FallsIdaho Falls | Idaho Falls | $4.299 |
| 7 | MeridianMeridian | Meridian | $4.299 |
Fuel grades at Costco in Idaho
All 7 Costco gas stations in Idaho sell Kirkland Signature fuel, which is Top Tier certified. Diesel is sold at 2 of the 7.
| Grade | Stations | Avg today | Cheapest |
|---|---|---|---|
| Regular | 7 | $4.220 | Coeur d Alene $3.959 |
| Premium | 7 | $4.783 | Coeur d Alene $4.499 |
| Diesel | 2 | $6.324 | Idaho Falls $6.299 |
Regular
all 7 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 7 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 7 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 Idaho good quality?
Costco does not sell a refiner’s brand. Every pump in Idaho 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 Idaho
On weekdays the earliest pumps in Idaho come on at 6 a.m. (Boise) and the last ones switch off at 10 p.m. (Boise). Pump hours run longer than the warehouse's, and weekends are shorter. Times are local.
| Station | Mon–Fri | Sat | Sun |
|---|---|---|---|
| Boise | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Coeur d Alene | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Idaho Falls | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Meridian | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Nampa | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Pocatello | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Twin Falls | 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 Idaho
Every Costco gas station sits in a warehouse parking lot, so a fill-up can share a trip with the rest of the list. 1 warehouse in Idaho also has a car wash.
- Food court
- 7 of 7
- Pharmacy
- 7 of 7
- Optical
- 7 of 7
- Tire center
- 7 of 7
- Car wash
- 1 of 7
- EV charging
- 0 of 7
Car wash: Boise.
How Costco gas works in Idaho
Bring your card. The pump asks for an active Costco membership card before it starts, at all 7 gas stations in Idaho. 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 Idaho can differ. Today the regular average here is $4.220. 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.
Idaho prices by city
- Boise · 1 station$4.299
- Coeur d'Alene · 1 station$3.959
- Idaho Falls · 1 station$4.299
- Meridian · 1 station$4.299
- Nampa · 1 station$4.299
- Pocatello · 1 station$4.289
- Twin Falls · 1 station$4.099
States near Idaho
- Costco gas prices Montana · 5 stations$4.151
- Costco gas prices Utah · 16 stations$4.283
- Costco gas prices Oregon · 13 stations$4.442
- Costco gas prices Washington · 34 stations$4.680
- Costco gas prices Nevada · 9 stations$4.752
- Costco gas prices Colorado · 15 stations$3.835
Costco gas in Idaho: common questions
Where is the cheapest Costco gas in Idaho today?
Coeur d Alene posts the lowest Regular price in Idaho, $3.959 as of the October 31, 2026 reading — $0.340 under Nampa, the most expensive of the 7 stations reporting.
How many Costco gas stations are there in Idaho?
Idaho has 7 Costco warehouses with a gas station, across 7 cities, and all of them reported a price in the last 30 days.
Which Costco gas stations in Idaho sell diesel?
Diesel is sold at 2 of 7 stations in Idaho. Each station page lists the grades that warehouse has actually posted a price for in the last 30 days.
Is Costco gas cheaper in Idaho than in the US?
Yes — the average Costco Regular price in Idaho is $4.220, $0.055 below the US average of $4.275 as of the October 31, 2026 reading.
Are Costco gas prices in Idaho going up or down?
Down — the average Costco Regular price in Idaho has eased about $0.620 over the past month, from $4.840 to $4.220.
What time do Costco gas stations in Idaho open?
The pumps open at 6 a.m. on weekdays at all 7 stations, ahead of the warehouse doors. Each station page carries its own full week, in local time.