Gas in Washington averaged $2.37 in 2005 — $3.90 in today’s money
The average price of a gallon of regular gasoline in Washington across 2005, shown both as it was at the pump and adjusted for inflation to constant 2025 dollars (CPI-U).
How Washington prices moved through 2005
Weekly average for regular gasoline. The year’s high was $2.96 the week of September 5, 2005; the low was $1.81 the week of January 17, 2005 — a swing of 63.6%.
View the weekly data (52 weeks)
| Week of | Nominal | 2025 $ |
|---|---|---|
| January 3, 2005 | $1.83 | $3.08 |
| January 10, 2005 | $1.81 | $3.04 |
| January 17, 2005 | $1.81 | $3.04 |
| January 24, 2005 | $1.82 | $3.06 |
| January 31, 2005 | $1.87 | $3.15 |
| February 7, 2005 | $1.89 | $3.16 |
| February 14, 2005 | $1.92 | $3.20 |
| February 21, 2005 | $1.99 | $3.32 |
| February 28, 2005 | $2.02 | $3.39 |
| March 7, 2005 | $2.07 | $3.45 |
| March 14, 2005 | $2.13 | $3.55 |
| March 21, 2005 | $2.16 | $3.60 |
| March 28, 2005 | $2.22 | $3.70 |
| April 4, 2005 | $2.29 | $3.81 |
| April 11, 2005 | $2.44 | $4.06 |
| April 18, 2005 | $2.48 | $4.12 |
| April 25, 2005 | $2.48 | $4.12 |
| May 2, 2005 | $2.47 | $4.11 |
| May 9, 2005 | $2.45 | $4.08 |
| May 16, 2005 | $2.42 | $4.02 |
| May 23, 2005 | $2.37 | $3.94 |
| May 30, 2005 | $2.32 | $3.86 |
| June 6, 2005 | $2.28 | $3.79 |
| June 13, 2005 | $2.26 | $3.76 |
| June 20, 2005 | $2.26 | $3.76 |
| June 27, 2005 | $2.31 | $3.84 |
| July 4, 2005 | $2.35 | $3.88 |
| July 11, 2005 | $2.42 | $4.01 |
| July 18, 2005 | $2.45 | $4.05 |
| July 25, 2005 | $2.45 | $4.05 |
| August 1, 2005 | $2.48 | $4.07 |
| August 8, 2005 | $2.55 | $4.19 |
| August 15, 2005 | $2.63 | $4.31 |
| August 22, 2005 | $2.67 | $4.39 |
| August 29, 2005 | $2.73 | $4.49 |
| September 5, 2005 | $2.96 | $4.79 |
| September 12, 2005 | $2.94 | $4.76 |
| September 19, 2005 | $2.90 | $4.70 |
| September 26, 2005 | $2.88 | $4.67 |
| October 3, 2005 | $2.89 | $4.67 |
| October 10, 2005 | $2.86 | $4.63 |
| October 17, 2005 | $2.81 | $4.54 |
| October 24, 2005 | $2.75 | $4.45 |
| October 31, 2005 | $2.63 | $4.24 |
| November 7, 2005 | $2.55 | $4.15 |
| November 14, 2005 | $2.47 | $4.01 |
| November 21, 2005 | $2.39 | $3.89 |
| November 28, 2005 | $2.34 | $3.80 |
| December 5, 2005 | $2.27 | $3.69 |
| December 12, 2005 | $2.19 | $3.56 |
| December 19, 2005 | $2.16 | $3.51 |
| December 26, 2005 | $2.15 | $3.49 |
2005: Washington and the national picture
2005 coincided with Hurricane Katrina and Gulf Coast refinery outages. In Washington, the weekly average for regular gasoline ran from a low of $1.81 (January 17, 2005) to a high of $2.96 (September 5, 2005). Adjusted for inflation, the year’s average of $3.90 ranks 17th-highest in the state’s weekly record.
How 2005 compares, adjusted for inflation
2005 was Washington’s 17th-most-expensive year for gas on record, adjusted for inflation — equivalently, the 8th-cheapest of 24 years (2003–2026).
Washington fuel prices by grade in 2005
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 | $2.37 | $3.90 | — |
| Midgrade | $2.48 | $4.08 | +10.9¢ |
| Premium | $2.58 | $4.25 | +21.0¢ |
Washington gas prices in 2005, answered
- What was the average price of gas in Washington in 2005?
- The average price of regular gasoline in Washington in 2005 was $2.37 per gallon — about $3.90 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 2005?
- Washington's weekly average for regular gasoline peaked at $2.96 the week of September 5, 2005 and bottomed out at $1.81 the week of January 17, 2005 — a swing of 63.6% across the year.
- Were gas prices in Washington higher in 2005 than in 2004?
- Adjusted for inflation, regular gasoline in Washington was more expensive in 2005 than in 2004, up 17.4% year over year.
- How does 2005 rank for gas prices in Washington history?
- Adjusted for inflation, 2005 was the 17th-most-expensive year for regular gasoline in Washington out of the 24 years EIA has published weekly prices (2003–2026).