Gas prices in Wyoming: Rocky Mountain average and state gas tax
There's no official weekly average just for Wyoming. What there is: the Rocky Mountain regional average, which the state is part of, at $4.51 for regular this week (September 21, 2026). That's +3.2¢ versus the whole country. Taxes are a big part of the story: Wyoming's state gas tax and fees total 24.0¢ per gallon (40th of 51, highest first), and diesel carries 24.0¢. Since January 2015, the gasoline rate has moved ±0.0¢.
The quick take
Crossing a state line can change the tax you pay: next door to Wyoming, rates run from 30.0¢ in South Dakota to 38.6¢ in Utah.
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 | 24.0¢ | 24.0¢ |
| Jan 2026 | 24.0¢ | 24.0¢ |
| Jul 2025 | 24.0¢ | 24.0¢ |
| Jan 2025 | 24.0¢ | 24.0¢ |
| Jul 2024 | 24.0¢ | 24.0¢ |
| Jan 2024 | 24.0¢ | 24.0¢ |
| Jul 2023 | 24.0¢ | 24.0¢ |
| Jan 2023 | 24.0¢ | 24.0¢ |
| Jul 2022 | 24.0¢ | 24.0¢ |
| Jan 2022 | 24.0¢ | 24.0¢ |
| Jul 2021 | 24.0¢ | 24.0¢ |
| Jul 2020 | 24.0¢ | 24.0¢ |
| Jan 2020 | 24.0¢ | 24.0¢ |
| Jul 2019 | 24.0¢ | 24.0¢ |
| Jan 2019 | 24.0¢ | 24.0¢ |
| Jul 2018 | 24.0¢ | 24.0¢ |
| Jan 2018 | 24.0¢ | 24.0¢ |
| Jul 2017 | 24.0¢ | 24.0¢ |
| Jan 2017 | 24.0¢ | 24.0¢ |
| Jul 2016 | 24.0¢ | 24.0¢ |
| Jan 2016 | 24.0¢ | 24.0¢ |
| Jul 2015 | 24.0¢ | 24.0¢ |
| Jan 2015 | 24.0¢ | 24.0¢ |
Neighboring states
Colorado30.2¢Idaho33.0¢Montana33.8¢Nebraska32.7¢South Dakota30.0¢Utah38.6¢
Map
Region: Rocky Mountain · Gas tax by state · Diesel prices · U.S. average