Gas Prices in South Dakota Today
Updated weekly from the US Energy Information Administration. South Dakota is part of the Midwest (PADD 2) supply region.
Current Gas Prices
Regular
N/A
per gallon
Midgrade
N/A
per gallon
Premium
N/A
per gallon
Diesel
N/A
per gallon
Price data not yet available for South Dakota. Add your EIA API key in .env to enable live prices.
South Dakota Gas Tax: 28¢ per gallon
South Dakota charges 28 cents per gallon in state excise tax, plus the federal 18.4¢/gal tax. Total tax burden: 46.4¢/gal. This relatively low tax helps keep South Dakota gas prices competitive.
Cheapest Gas Stations in South Dakota
Compare with Neighboring States
Frequently Asked Questions About South Dakota Gas Prices
What is the average gas price in South Dakota right now?▾
Gas prices in South Dakota are updated weekly. Check back soon for the latest statewide average, or browse our city pages for the most current local data. Historically, South Dakota prices track closely with the Midwest regional average.
What is the gas tax in South Dakota?▾
South Dakota charges approximately 28 cents per gallon in state excise taxes on gasoline. The federal gas tax adds another 18.4 cents per gallon, bringing the combined tax burden to roughly 46.4 cents per gallon. South Dakota's state tax is below the national average, which helps keep pump prices relatively low.
When is the cheapest day to buy gas in South Dakota?▾
Nationally, Monday and Tuesday tend to offer the lowest gas prices, while Friday and Saturday are often the most expensive as weekend demand rises. In South Dakota, patterns follow similar trends. Prices also fluctuate based on crude oil markets, which reset each week. Checking prices early in the week can save you several cents per gallon.
How does South Dakota gas compare to neighboring states?▾
South Dakota borders north dakota, minnesota, iowa, and prices across state lines can vary by 5–30 cents per gallon depending on each state's gas tax, refinery access, and local competition. South Dakota's PADD 2 regional supply chain primarily influences local prices. Drivers near state borders may find it worthwhile to cross state lines for a fill-up if price differentials are significant.
Why do gas prices change so frequently in South Dakota?▾
Gas prices in South Dakota react to several factors: crude oil futures (the biggest driver), local refinery output, seasonal fuel blend mandates, transportation costs to Pierre, and local retailer margins. Prices typically update weekly or more frequently when crude markets are volatile. Summer-blend gasoline, which is more expensive to produce, also raises prices from spring through Labor Day.
How can I find the cheapest gas station in South Dakota?▾
Use our station finder on any city page to see real-time prices at nearby stations. Apps like GasBuddy can also show crowdsourced prices. In general, warehouse clubs (Costco, Sam's Club) and hypermarket fuel centers (Walmart, Kroger) consistently offer prices 5–15 cents below branded stations in South Dakota. Avoid gas stations directly off major interstates, which typically charge a convenience premium.
Does South Dakota require reformulated gasoline?▾
Some metro areas within South Dakota may have seasonal or year-round reformulated gasoline requirements under EPA standards. Check the EPA's RFG locator for specific South Dakota counties. Outside designated RFG areas, conventional gasoline is sold at lower cost.
What fuel grade should I use for my car in South Dakota?▾
Most vehicles on the road today are designed for regular 87-octane unleaded gasoline. Check your owner's manual — only use premium (91+) if your vehicle requires or recommends it. Using premium when regular is specified wastes money without performance benefit. Midgrade (89 octane) is rarely the optimal choice for any modern vehicle.
Understanding Gas Prices in South Dakota
Gas prices in South Dakota are influenced by several regional factors including proximity to refineries, pipeline infrastructure, state regulations, and seasonal fuel blend requirements. South Dakota sits in the PADD 2 supply region (Midwest), which means local prices largely trackMidwest refinery output.
The South Dakota state excise tax of 28¢ per gallon is near the national average, adding approximately $0.28 to every gallon sold at the pump. On a 15-gallon fill-up, South Dakota drivers pay about $6.96 in combined state and federal fuel taxes.
Prices vary significantly across South Dakota's cities and regions. Urban areas like Pierre tend to have more competition between gas stations, which can keep prices closer to the state average. Rural areas may see prices 10–20¢ higher due to fewer competing stations and higher delivery costs.