Gas in Colorado averaged $2.26 in 2005 — $3.72 in today’s money
The average price of a gallon of regular gasoline in Colorado across 2005, shown both as it was at the pump and adjusted for inflation to constant 2025 dollars (CPI-U).
How Colorado prices moved through 2005
Weekly average for regular gasoline. The year’s high was $3.04 the week of September 5, 2005; the low was $1.73 the week of January 10, 2005 — a swing of 76.1%.
View the weekly data (52 weeks)
| Week of | Nominal | 2025 $ |
|---|---|---|
| January 3, 2005 | $1.75 | $2.95 |
| January 10, 2005 | $1.73 | $2.90 |
| January 17, 2005 | $1.74 | $2.93 |
| January 24, 2005 | $1.78 | $2.99 |
| January 31, 2005 | $1.83 | $3.08 |
| February 7, 2005 | $1.83 | $3.07 |
| February 14, 2005 | $1.82 | $3.05 |
| February 21, 2005 | $1.87 | $3.13 |
| February 28, 2005 | $1.90 | $3.17 |
| March 7, 2005 | $1.99 | $3.32 |
| March 14, 2005 | $2.07 | $3.46 |
| March 21, 2005 | $2.10 | $3.49 |
| March 28, 2005 | $2.17 | $3.61 |
| April 4, 2005 | $2.19 | $3.64 |
| April 11, 2005 | $2.27 | $3.77 |
| April 18, 2005 | $2.24 | $3.73 |
| April 25, 2005 | $2.22 | $3.69 |
| May 2, 2005 | $2.21 | $3.68 |
| May 9, 2005 | $2.19 | $3.64 |
| May 16, 2005 | $2.16 | $3.59 |
| May 23, 2005 | $2.12 | $3.53 |
| May 30, 2005 | $2.09 | $3.47 |
| June 6, 2005 | $2.08 | $3.46 |
| June 13, 2005 | $2.09 | $3.48 |
| June 20, 2005 | $2.09 | $3.48 |
| June 27, 2005 | $2.14 | $3.55 |
| July 4, 2005 | $2.19 | $3.62 |
| July 11, 2005 | $2.27 | $3.75 |
| July 18, 2005 | $2.27 | $3.76 |
| July 25, 2005 | $2.25 | $3.72 |
| August 1, 2005 | $2.24 | $3.68 |
| August 8, 2005 | $2.30 | $3.77 |
| August 15, 2005 | $2.46 | $4.03 |
| August 22, 2005 | $2.60 | $4.26 |
| August 29, 2005 | $2.61 | $4.29 |
| September 5, 2005 | $3.04 | $4.92 |
| September 12, 2005 | $3.00 | $4.85 |
| September 19, 2005 | $2.88 | $4.67 |
| September 26, 2005 | $2.87 | $4.64 |
| October 3, 2005 | $2.91 | $4.70 |
| October 10, 2005 | $2.85 | $4.60 |
| October 17, 2005 | $2.79 | $4.50 |
| October 24, 2005 | $2.70 | $4.36 |
| October 31, 2005 | $2.58 | $4.18 |
| November 7, 2005 | $2.47 | $4.01 |
| November 14, 2005 | $2.37 | $3.86 |
| November 21, 2005 | $2.28 | $3.70 |
| November 28, 2005 | $2.21 | $3.59 |
| December 5, 2005 | $2.14 | $3.48 |
| December 12, 2005 | $2.15 | $3.49 |
| December 19, 2005 | $2.18 | $3.54 |
| December 26, 2005 | $2.15 | $3.49 |
2005: Colorado and the national picture
2005 coincided with Hurricane Katrina and Gulf Coast refinery outages. In Colorado, the weekly average for regular gasoline ran from a low of $1.73 (January 10, 2005) to a high of $3.04 (September 5, 2005). Adjusted for inflation, the year’s average of $3.72 ranks 11th-highest in the state’s weekly record.
How 2005 compares, adjusted for inflation
2005 was Colorado’s 11th-most-expensive year for gas on record, adjusted for inflation — equivalently, the 17th-cheapest of 27 years (2000–2026).
Colorado 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 | $2.26 | $3.72 | — |
| Midgrade | $2.37 | $3.90 | +10.9¢ |
| Premium | $2.47 | $4.06 | +21.0¢ |
Colorado gas prices in 2005, answered
- What was the average price of gas in Colorado in 2005?
- The average price of regular gasoline in Colorado in 2005 was $2.26 per gallon — about $3.72 in 2025 dollars after adjusting for inflation, according to U.S. Energy Information Administration weekly data.
- How high did gas prices get in Colorado during 2005?
- Colorado's weekly average for regular gasoline peaked at $3.04 the week of September 5, 2005 and bottomed out at $1.73 the week of January 10, 2005 — a swing of 76.1% across the year.
- Were gas prices in Colorado higher in 2005 than in 2004?
- Adjusted for inflation, regular gasoline in Colorado was more expensive in 2005 than in 2004, up 20.3% year over year.
- How does 2005 rank for gas prices in Colorado history?
- Adjusted for inflation, 2005 was the 11th-most-expensive year for regular gasoline in Colorado out of the 27 years EIA has published weekly prices (2000–2026).