Gas Prices in Rapid City, SD
Updated May 20, 2026 · AAA data · Regular unleaded
Gas Prices in Rapid City
Gas prices in Rapid City reflect a mix of local taxes, distance to fuel distribution terminals, station density, and real estate costs. Rapid City benefits from lower operating costs, typically running 1¢ below the South Dakota state average.
Prices at individual stations can vary by 5–15 cents within the same city depending on brand, location, and local competition. Use apps like GasBuddy to find the cheapest station near you in Rapid City.
Frequently Asked Questions
What is the gas price in Rapid City right now?
The average regular unleaded price in Rapid City, South Dakota is $4.330/gal as of May 20, 2026. Station prices vary — expect a range of roughly $4.230 to $4.450 across the metro area.
Is gas cheaper in Rapid City or the suburbs?
Generally, suburban areas outside Rapid City have slightly lower gas prices due to lower operating costs and property taxes. If you're near a highway interchange or warehouse district, you may find lower prices than the city center.
When is the cheapest day to buy gas in Rapid City?
Nationwide data shows Monday and Tuesday tend to have slightly lower gas prices before weekly demand picks up. Avoid buying gas Thursday through Saturday when prices are typically higher.