Gas prices in Utah: Rocky Mountain average and state gas tax
The EIA doesn't publish a weekly gas price for Utah on its own, so the closest official figure is the Rocky Mountain average: $4.51 a gallon for regular in the week of September 21, 2026, +7.2¢ from the week before. On top of the pump price, Utah charges 38.6¢ a gallon in state gas taxes and fees, 14th highest of 51. Add the federal 18.4¢ and taxes come to 57.0¢ a gallon, roughly 13% of the average price shown here.
The quick take
Among the 5 states that border Utah, Arizona has the lightest gas tax at 19.0¢ a gallon and Idaho the heaviest at 33.0¢.
Regular gas, weekly average · Rocky Mountain
September 30, 2024: $3.415 · September 21, 2026: $4.510 · min $2.403 · max $4.587
The state's gas tax since 2015
| Rate as of | Gasoline | Diesel |
|---|---|---|
| Jul 2026 | 38.6¢ | 38.6¢ |
| Jan 2026 | 38.6¢ | 38.6¢ |
| Jul 2025 | 39.1¢ | 39.1¢ |
| Jan 2025 | 39.1¢ | 39.1¢ |
| Jul 2024 | 37.1¢ | 37.1¢ |
| Jan 2024 | 37.1¢ | 37.1¢ |
| Jul 2023 | 35.1¢ | 35.1¢ |
| Jan 2023 | 37.0¢ | 37.0¢ |
| Jul 2022 | 32.6¢ | 32.6¢ |
| Jan 2022 | 32.6¢ | 32.6¢ |
| Jul 2021 | 32.0¢ | 32.0¢ |
| Jul 2020 | 31.8¢ | 31.8¢ |
| Jan 2020 | 31.8¢ | 31.8¢ |
| Jul 2019 | 30.6¢ | 30.6¢ |
| Jan 2019 | 30.6¢ | 30.6¢ |
| Jul 2018 | 30.0¢ | 30.0¢ |
| Jan 2018 | 30.0¢ | 30.0¢ |
| Jul 2017 | 30.0¢ | 30.0¢ |
| Jan 2017 | 30.0¢ | 30.0¢ |
| Jul 2016 | 30.0¢ | 30.0¢ |
| Jan 2016 | 30.0¢ | 30.0¢ |
| Jul 2015 | 25.1¢ | 25.1¢ |
| Jan 2015 | 25.1¢ | 25.1¢ |
Neighboring states
Arizona19.0¢Colorado30.2¢Idaho33.0¢Nevada23.8¢Wyoming24.0¢
Map
Region: Rocky Mountain · Gas tax by state · Diesel prices · U.S. average