Distance between cities › USA › Montana › Grass Range, MT › Distance from Grass Range to Interior Book Hotels

Distance from Grass Range, MT to Interior, SD

Distance

490 mi

Time

9 hours 16 mins

Gas Cost

$46 - $89

There are 401.71 miles from Grass Range to Interior in southeast direction and 490 miles (788.58 kilometers) by car, following the US-212 and MT 59 route.

Grass Range and Interior are 9 hours 16 mins far apart, if you drive non-stop .

This is the fastest route from Grass Range, MT to Interior, SD. The halfway point is Gillette, WY.

Grass Range, MT and Interior, SD are in the same time zone (MDT). Current time in both locations is 2:59 am.

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Lowest Price Rental Cars in Grass Range, MT

Planning on renting a car to go from Grass Range, MT to Interior, SD? Here there are some offers to rent a car in Grass Range, MT

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Grass Range »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 19.70 gallons of gas to cover the route between Grass Range, MT and Interior, SD.

The estimated cost of gas to go from Grass Range to Interior is $64.25.

During the route, an average car will release 385.87 pounds of CO₂ to the atmosphere. The carbon footprint would be 0.79 pounds of CO₂ per mile.

Average USA gas price used for calculation is $3.26 per gallon of regular gas. Price last updated on March 12, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Grass Range, MT and Interior, SD

If you want to meet halfway between Grass Range, MT and Interior, SD or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 44.211308 and -106.105865, or 44º 12' 40.7088" N, 106º 6' 21.114" W. This location is 245.20 miles away from Grass Range, MT and Interior, SD and it would take approximately 4 hours 38 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Gillette, WY, situated 322 miles from Grass Range, MT and 224 miles from Interior, SD. It would take 5 hours 58 mins to go from Grass Range to Gillette and 3 hours 23 mins to go from Interior to Gillette.