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

Distance from Grass Range, MT to Ashton, SD

Distance

641 mi

Time

11 hours 14 mins

Gas Cost

$54 - $104

There are 513.69 miles from Grass Range to Ashton in southeast direction and 641 miles (1,031.59 kilometers) by car, following the I-94 route.

Grass Range and Ashton are 11 hours 14 mins far apart, if you drive non-stop .

This is the fastest route from Grass Range, MT to Ashton, SD. The halfway point is South Heart, ND.

Please note the time difference between Grass Range, MT and Ashton, SD is 1 hour. The current time in Grass Range is 12:16 am and the current time in Ashton is 1:16 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 Ashton, 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 25.76 gallons of gas to cover the route between Grass Range, MT and Ashton, SD.

The estimated cost of gas to go from Grass Range to Ashton is $75.21.

During the route, an average car will release 504.62 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 $2.92 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 Ashton, SD

If you want to meet halfway between Grass Range, MT and Ashton, SD or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 46.891556 and -103.089317, or 46º 53' 29.6016" N, 103º 5' 21.5412" W. This location is 320.67 miles away from Grass Range, MT and Ashton, SD and it would take approximately 5 hours 37 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is South Heart, ND, situated 327 miles from Grass Range, MT and 341 miles from Ashton, SD. It would take 6 hours 38 mins to go from Grass Range to South Heart and 5 hours 51 mins to go from Ashton to South Heart.