South Dakota diesel prices today
South Dakota diesel prices todayDiesel averages $6.03 a gallon in South Dakota on 2 October 2026 — the 42nd most expensive of 51 states, and down $0.20 on the week.
South Dakota against the other states
$0.33 a gallon below the unweighted mean of AAA's 51 state averages ($6.36). The cheapest diesel is in Texas at $5.79, the dearest in California at $8.38.
Regular gas in South Dakota is $4.25, so diesel costs $1.77 more per gallon — and more than premium at $5.07.
Tax on a gallon of diesel
$0.24 federal + $0.30 South Dakota · 32nd highest of 51. The rest — about $5.48 — is the fuel itself, refining, distribution and the retailer’s margin.
Rates as of 1 January 2026. Local taxes, where they apply, are not included.
Diesel prices by city in South Dakota
AAA's diesel averages for 3 South Dakota metro areas, cheapest first — $0.33 a gallon between the two ends.
| Metro area | Diesel | vs state |
|---|---|---|
| Sioux Falls | $5.82 | −$0.21 |
| North Sioux City | $5.86 | −$0.16 |
| Rapid City | $6.15 | +$0.12 |
Show the data as a table
What a diesel fill-up costs in South Dakota
- Diesel car or SUV — 18 gal$108.50
- Heavy-duty pickup — 34 gal$204.95
- Box truck — 60 gal$361.68
- Semi truck, two tanks — 250 gal$1,507.00
Diesel in neighbouring states
More for South Dakota
Frequently asked questions
How much is diesel in South Dakota today?
$6.03 a gallon, AAA's South Dakota average for 2 October 2026 — the 42nd most expensive of 51 states. Regular gasoline is $4.25, so diesel costs $1.77 more per gallon.
Are diesel prices going up in South Dakota?
Diesel is down $0.20 (3.2%) on a week ago, and up $2.67 on a year ago, when it was $3.36, on AAA's own earlier averages.
Where is diesel cheapest in South Dakota?
Of the 3 metro areas AAA reports in South Dakota, Sioux Falls has the cheapest diesel at $5.82 a gallon and Rapid City the dearest at $6.15. Individual stations vary around these averages.
How much is the diesel tax in South Dakota?
$0.54 a gallon: $0.24 federal plus $0.30 in South Dakota state taxes and fees, the 32nd highest of 51. The state average is $0.36. Rates as of 1 January 2026.