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

Distance from Grass Range, MT to Keystone, SD

Distance

429 mi

Time

8 hours 16 mins

Gas Cost

$40 - $78

There are 338.89 miles from Grass Range to Keystone in southeast direction and 429 miles (690.41 kilometers) by car, following the US-212 and MT 59 route.

Grass Range and Keystone are 8 hours 16 mins far apart, if you drive non-stop .

This is the fastest route from Grass Range, MT to Keystone, SD.

Grass Range, MT and Keystone, SD are in the same time zone (MDT). Current time in both locations is 3:00 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 Keystone, 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 17.21 gallons of gas to cover the route between Grass Range, MT and Keystone, SD.

The estimated cost of gas to go from Grass Range to Keystone is $56.14.

During the route, an average car will release 337.17 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 Keystone, SD

If you want to meet halfway between Grass Range, MT and Keystone, SD or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 45.569861 and -106.203385, or 45º 34' 11.4996" N, 106º 12' 12.186" W. This location is 214.26 miles away from Grass Range, MT and Keystone, SD and it would take approximately 4 hours 8 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Ashland, MT, situated 216 miles from Grass Range, MT and 218 miles from Keystone, SD. It would take 4 hours 12 mins to go from Grass Range to Ashland and 4 hours 19 mins to go from Keystone to Ashland.