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

Distance from Grass Range, MT to Oakley, ID

Distance

539 mi

Time

10 hours 31 mins

Gas Cost

$50 - $98

There are 413.95 miles from Grass Range to Oakley in southwest direction and 539 miles (867.44 kilometers) by car, following the US-191 route.

Grass Range and Oakley are 10 hours 31 mins far apart, if you drive non-stop .

This is the fastest route from Grass Range, MT to Oakley, ID.

Grass Range, MT and Oakley, ID are in the same time zone (MDT). Current time in both locations is 2:01 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 Oakley, ID? 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 21.67 gallons of gas to cover the route between Grass Range, MT and Oakley, ID.

The estimated cost of gas to go from Grass Range to Oakley is $70.67.

During the route, an average car will release 424.47 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 Oakley, ID

If you want to meet halfway between Grass Range, MT and Oakley, ID or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 44.943712 and -111.05776, or 44º 56' 37.3632" N, 111º 3' 27.936" W. This location is 269.73 miles away from Grass Range, MT and Oakley, ID and it would take approximately 5 hours 15 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Mammoth, WY, situated 228 miles from Grass Range, MT and 303 miles from Oakley, ID. It would take 4 hours 40 mins to go from Grass Range to Mammoth and 6 hours 14 mins to go from Oakley to Mammoth.