Gas Prices in South Dakota Today

Updated April 5, 2026 — Prices updated regularly from EIA data

$3.00

Average regular unleaded — South Dakota

Today's South Dakota Gas Prices

Today's regular unleaded price in South Dakota is $$3.00 per gallon, placing it below ($0.99) the national average. South Dakota's Plains regional market conditions — including refinery proximity and pipeline access — play a decisive role in pricing.

Fuel TypePrice / GallonGradeTrend
Regular Unleaded$3.0087 octane▲ Rising
Mid-Grade$3.4789 octane▲ Rising
Premium$3.7591-93 octane▲ Rising
Diesel$4.06N/A▲ Rising

Gas Prices Across South Dakota Cities

Sioux Falls$3.03Rapid City$3.10Aberdeen$3.06

About South Dakota Fuel Markets

South Dakota charges 28 cents per gallon in state fuel taxes. The Plains state relies on regional fuel infrastructure for supply.

Fuel Type Prices in This City

Regular Unleaded
87 octane
Premium Gasoline
91-93 octane
Diesel Fuel
N/A

Gas Prices in Neighboring & Popular States

CaliforniaCAFloridaFLGeorgiaGAIllinoisILNew YorkNYNorth CarolinaNC
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Frequently Asked Questions

In South Dakota, as in most US states, Monday and Tuesday tend to show the lowest weekly prices. Prices rise Thursday through Sunday as weekend demand increases. Filling up Tuesday afternoon typically captures the weekly low.
South Dakota charges 28 cents per gallon in state fuel taxes. The national average is around 30 cents per gallon. South Dakota's tax places it among the mid-range states nationally for fuel taxation.
South Dakota gas stations offer regular (87 octane) at $$3.00, mid-grade (89 octane) at approximately $$3.47, premium (91-93 octane) at $$3.75, and diesel at $$4.06 per gallon. Most stations also offer E85 ethanol blend where flex-fuel vehicles are common.
Many states require reformulated gasoline (RFG) or special summer blends to meet EPA air quality standards during warmer months. These blends reduce evaporative emissions but cost 5-15 cents more per gallon to produce.
Costco consistently offers the cheapest gas in any South Dakota market where it operates — typically 15-20 cents below local street prices. Circle K, Speedway, and QuikTrip (where available) also routinely undercut the market average. Premium brands like Shell, Chevron, and BP typically price above the local average.

Related Gas Price Pages

Compare Gas Prices by StateCheapest Gas in South DakotaGas Price HistoryRoad Trip CalculatorRegular Unleaded Prices in South DakotaPremium Gasoline Prices in South DakotaDiesel Fuel Prices in South DakotaShell in South DakotaExxon in South DakotaBP in South DakotaChevron in South Dakota