Gas in Washington averaged $2.70 in 2015 — $3.66 in today’s money
The average price of a gallon of regular gasoline in Washington across 2015, shown both as it was at the pump and adjusted for inflation to constant 2025 dollars (CPI-U).
How Washington prices moved through 2015
Weekly average for regular gasoline. The year’s high was $3.18 the week of June 29, 2015; the low was $2.11 the week of February 2, 2015 — a swing of 50.8%.
View the weekly data (52 weeks)
| Week of | Nominal | 2025 $ |
|---|---|---|
| January 5, 2015 | $2.46 | $3.38 |
| January 12, 2015 | $2.35 | $3.22 |
| January 19, 2015 | $2.24 | $3.07 |
| January 26, 2015 | $2.15 | $2.95 |
| February 2, 2015 | $2.11 | $2.89 |
| February 9, 2015 | $2.18 | $2.98 |
| February 16, 2015 | $2.28 | $3.12 |
| February 23, 2015 | $2.38 | $3.26 |
| March 2, 2015 | $2.66 | $3.63 |
| March 9, 2015 | $2.83 | $3.86 |
| March 16, 2015 | $2.76 | $3.76 |
| March 23, 2015 | $2.73 | $3.73 |
| March 30, 2015 | $2.71 | $3.70 |
| April 6, 2015 | $2.71 | $3.69 |
| April 13, 2015 | $2.70 | $3.68 |
| April 20, 2015 | $2.72 | $3.71 |
| April 27, 2015 | $2.79 | $3.81 |
| May 4, 2015 | $2.92 | $3.97 |
| May 11, 2015 | $2.96 | $4.03 |
| May 18, 2015 | $3.00 | $4.07 |
| May 25, 2015 | $3.03 | $4.11 |
| June 1, 2015 | $3.02 | $4.10 |
| June 8, 2015 | $3.03 | $4.11 |
| June 15, 2015 | $3.09 | $4.18 |
| June 22, 2015 | $3.16 | $4.28 |
| June 29, 2015 | $3.18 | $4.31 |
| July 6, 2015 | $3.17 | $4.29 |
| July 13, 2015 | $3.17 | $4.29 |
| July 20, 2015 | $3.15 | $4.27 |
| July 27, 2015 | $3.15 | $4.26 |
| August 3, 2015 | $3.15 | $4.25 |
| August 10, 2015 | $3.10 | $4.20 |
| August 17, 2015 | $3.04 | $4.11 |
| August 24, 2015 | $3.00 | $4.06 |
| August 31, 2015 | $2.90 | $3.92 |
| September 7, 2015 | $2.83 | $3.83 |
| September 14, 2015 | $2.74 | $3.71 |
| September 21, 2015 | $2.65 | $3.59 |
| September 28, 2015 | $2.58 | $3.49 |
| October 5, 2015 | $2.50 | $3.38 |
| October 12, 2015 | $2.45 | $3.32 |
| October 19, 2015 | $2.42 | $3.27 |
| October 26, 2015 | $2.39 | $3.24 |
| November 2, 2015 | $2.37 | $3.21 |
| November 9, 2015 | $2.47 | $3.34 |
| November 16, 2015 | $2.47 | $3.34 |
| November 23, 2015 | $2.44 | $3.30 |
| November 30, 2015 | $2.41 | $3.26 |
| December 7, 2015 | $2.38 | $3.23 |
| December 14, 2015 | $2.37 | $3.21 |
| December 21, 2015 | $2.39 | $3.24 |
| December 28, 2015 | $2.42 | $3.28 |
2015: Washington and the national picture
2015 coincided with the global collapse in crude-oil prices. In Washington, the weekly average for regular gasoline ran from a low of $2.11 (February 2, 2015) to a high of $3.18 (June 29, 2015). Adjusted for inflation, the year’s average of $3.66 ranks 20th-highest in the state’s weekly record.
How 2015 compares, adjusted for inflation
2015 was Washington’s 20th-most-expensive year for gas on record, adjusted for inflation — equivalently, the 5th-cheapest of 24 years (2003–2026).
Washington fuel prices by grade in 2015
Year-average price per grade. Premium figures are the spread drivers paid for higher-octane fuel that year.
| Grade | Avg / gal | 2025 $ | vs. regular |
|---|---|---|---|
| Regular | $2.70 | $3.66 | — |
| Midgrade | $2.86 | $3.89 | +16.3¢ |
| Premium | $2.99 | $4.06 | +29.6¢ |
Washington gas prices in 2015, answered
- What was the average price of gas in Washington in 2015?
- The average price of regular gasoline in Washington in 2015 was $2.70 per gallon — about $3.66 in 2025 dollars after adjusting for inflation, according to U.S. Energy Information Administration weekly data.
- How high did gas prices get in Washington during 2015?
- Washington's weekly average for regular gasoline peaked at $3.18 the week of June 29, 2015 and bottomed out at $2.11 the week of February 2, 2015 — a swing of 50.8% across the year.
- Were gas prices in Washington higher in 2015 than in 2014?
- Adjusted for inflation, regular gasoline in Washington was cheaper in 2015 than in 2014, down 24.3% year over year.
- How does 2015 rank for gas prices in Washington history?
- Adjusted for inflation, 2015 was the 20th-most-expensive year for regular gasoline in Washington out of the 24 years EIA has published weekly prices (2003–2026).