Gas Prices in South Dakota Today
Track today's average gas price in South Dakota, compare it to the national average, and estimate your fuel costs with a free calculator. Prices come from the EIA's weekly retail gasoline survey.
Average Gas Price for South Dakota (EIA Midwest region)
$4.27/gal
Same as the national average
EIA weekly price for regular gasoline, week of October 26, 2026.
Estimate Your Gas Cost in South Dakota
The calculator below is pre-filled with this Midwest regional average. Enter your trip distance and MPG to get an instant fuel cost estimate.
Midwest Region Gas Price History
The EIA does not publish weekly prices for South Dakota, so this chart shows the Midwest regional average for regular gasoline, the same series behind the South Dakota price above. The region also covers Illinois, Indiana, Iowa, Kansas, Kentucky, Michigan, Missouri, Nebraska, North Dakota, Oklahoma, Tennessee, and Wisconsin, so the line describes the region as a whole, not South Dakota alone. The latest week is $1.40 a gallon higher than a year earlier.
Latest week
$4.27
October 26, 2026
A year earlier
$2.87
October 27, 2025
Highest week shown
$4.41
May 11, 2026
Lowest week shown
$2.58
January 5, 2026
Source: EIA weekly retail prices for regular gasoline, Midwest regional average, November 4, 2024 to October 26, 2026. Prices in dollars per gallon.
About Gas Prices in South Dakota
The U.S. Energy Information Administration (EIA) surveys fuel retailers weekly but doesn't publish a separate price for South Dakota, so the price shown is the EIA's Midwest regional average for regular unleaded gasoline. Prices at individual stations in South Dakota may be higher or lower depending on location, brand, and local competition.
Several factors influence South Dakota's gas price: state fuel taxes, the distance from major refineries, pipeline and distribution infrastructure, and the required seasonal fuel blend. Use the calculator above to see exactly how today's South Dakota price affects your commute, road trip, or monthly driving budget.
South Dakota Fuel Taxes: ≈30¢/gal
South Dakota has a state gas tax close to the national average. South Dakota's state gas tax is about 30 cents per gallon, close to the roughly 33.5-cent national average.
Tax figures are approximate state-level taxes and fees per gallon of regular gasoline and exclude the 18.4¢/gal federal excise tax. Rates change, so verify current rates with the state's revenue or transportation department.
How South Dakota Gets Its Gasoline
South Dakota has no oil refineries and depends on pipelines carrying gasoline in from Midwest refineries, including the large Flint Hills Resources refinery near the Twin Cities in Minnesota. As one of the nation's top ethanol-producing states, South Dakota also has unusually wide access to E85 and other high-ethanol blends at the pump.
Where Gas Is Cheapest and Most Expensive in South Dakota
Prices along I-90 and I-29, connecting Sioux Falls and Rapid City to pipeline terminals, tend to run close to the state average. The most rural western counties, farthest from any terminal, typically see a modest premium.