Weekly area comparison
Gas prices in Castle Rock
Dated weekly regular-gasoline average in the Denver area, with a trend and U.S. comparison. Not a live station price.
Average regular gas · Denver area
$4.24/gal
Week of October 19, 2026 · up 9¢ from the week before, down 1¢ across 6 weekly observations
- Colorado$4.273¢ more than Denver area
- U.S. average$4.284¢ more than Denver area
- $4.25Sep 14
- $4.21Sep 21
- $4.03Sep 28
- $3.98Oct 5
- $4.15Oct 12
- $4.24Oct 19
Source: U.S. Energy Information Administration, weekly retail gasoline prices (regular, all formulations, including taxes). Averages for the area, not a price at any one station.
Save on gas in Castle Rock
- Check the posted pump price and any payment or membership conditions before filling up.
- Compare available station prices along your route; the regional average is not a quote for a particular station.
- If a station advertises a discount, check its eligibility and payment terms.
- Planning a drive? See getting around Castle Rock and our commute page.
Questions
What is the weekly EIA gas-price comparison for Castle Rock?
For the week of October 19, 2026, regular gasoline averaged $4.24 a gallon in the EIA Denver area survey area, compared with $4.28 nationally. This is a metropolitan-area comparison, not a separate average for Castle Rock or a live station price.
Where does the weekly average come from?
From the U.S. Energy Information Administration’s weekly survey of retail gasoline prices, published every Monday. This page uses the Denver area as a metropolitan-area comparison. It is not a separate average for Castle Rock.
Why is the price at my Castle Rock station different?
Stations set their own prices, and this is an average across many stations for the whole area. Brand, location, cash or card and membership discounts all change the price at the pump.
When do these numbers update?
EIA publishes new averages each Monday afternoon (Tuesday after a Monday holiday). This page checks for the new week twice a day.