Costco gas prices in Montana
Montana average
- Regular
- $4.115
- Premium
- $4.719
- Diesel
- $4.674
Average across 5 stations, per gallon · updated July 22, 2026
Costco has 5 gas stations in Montana — the cheapest regular today is $4.099/gal at Costco Billings in Billings. Montana Costco regular prices have climbed about $0.236 per gallon over the past month, from $3.879 to $4.115. Premium is up $0.278 over the same stretch, now at $4.719. Diesel is up $0.225 over the same stretch, now at $4.674.
Gas stations
5
Montana
Avg regular
$4.115
per gallon, USD
Cheapest now
$4.099
Costco Billings
30-day price trend
Regular$4.115Premium$4.719Diesel$4.674
View price history as a table
| Date | Regular | Premium | Diesel |
|---|---|---|---|
| July 22, 2026 | $4.115 | $4.719 | $4.674 |
| July 21, 2026 | $4.061 | $4.659 | $4.599 |
| July 20, 2026 | $4.009 | $4.619 | $4.569 |
| July 19, 2026 | $4.009 | $4.599 | $4.519 |
| July 18, 2026 | $4.001 | $4.589 | $4.519 |
| July 17, 2026 | $3.895 | $4.471 | $4.464 |
| July 16, 2026 | $3.875 | $4.467 | $4.364 |
| July 15, 2026 | $3.857 | $4.455 | $4.359 |
| July 14, 2026 | $3.851 | $4.415 | $4.299 |
| July 13, 2026 | $3.839 | $4.395 | $4.279 |
| July 12, 2026 | $3.809 | $4.347 | $4.249 |
| July 11, 2026 | $3.801 | $4.345 | $4.229 |
| July 10, 2026 | $3.817 | $4.355 | $4.229 |
| July 9, 2026 | $3.799 | $4.321 | $4.209 |
| July 8, 2026 | $3.747 | $4.271 | $4.144 |
| July 7, 2026 | $3.757 | $4.303 | $4.144 |
| July 6, 2026 | $3.769 | $4.335 | $4.144 |
| July 5, 2026 | $3.777 | $4.313 | $4.144 |
| July 4, 2026 | $3.757 | $4.285 | $4.144 |
| July 3, 2026 | $3.757 | $4.285 | $4.144 |
| July 2, 2026 | $3.769 | $4.299 | $4.214 |
| July 1, 2026 | $3.767 | $4.311 | $4.219 |
| June 30, 2026 | $3.777 | $4.317 | $4.234 |
| June 29, 2026 | $3.805 | $4.349 | $4.249 |
| June 28, 2026 | $3.809 | $4.355 | $4.249 |
| June 27, 2026 | $3.821 | $4.355 | $4.274 |
| June 26, 2026 | $3.843 | $4.385 | $4.299 |
| June 25, 2026 | $3.881 | $4.407 | $4.349 |
| June 24, 2026 | $3.899 | $4.427 | $4.399 |
| June 23, 2026 | $3.879 | $4.441 | $4.449 |
All stations in Montana
All 5 stations, sorted by regular price from lowest to highest. Prices in $/gal.
| Rank | Station | Regular | Premium | Diesel |
|---|---|---|---|---|
| 1 | Costco BillingsBillings | $4.099 | $4.699 | $4.649 |
| 2 | Costco BozemanBozeman | $4.099 | $4.799 | — |
| 3 | Costco KalispellKalispell | $4.099 | $4.699 | $4.699 |
| 4 | Costco MissoulaMissoula | $4.099 | $4.599 | — |
| 5 | Costco HelenaHelena | $4.179 | $4.799 | — |