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

Distance from Grass Range, MT to Iona, ID

Distance

392 mi

Time

7 hours 53 mins

Gas Cost

$36 - $71

There are 285.61 miles from Grass Range to Iona in southwest direction and 392 miles (630.86 kilometers) by car, following the US-191 route.

Grass Range and Iona are 7 hours 53 mins far apart, if you drive non-stop .

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

Grass Range, MT and Iona, ID are in the same time zone (MDT). Current time in both locations is 1:51 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 Iona, 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 15.73 gallons of gas to cover the route between Grass Range, MT and Iona, ID.

The estimated cost of gas to go from Grass Range to Iona is $51.30.

During the route, an average car will release 308.10 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 Iona, ID

If you want to meet halfway between Grass Range, MT and Iona, ID or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 45.643373 and -110.92645, or 45º 38' 36.1428" N, 110º 55' 35.22" W. This location is 195.79 miles away from Grass Range, MT and Iona, ID and it would take approximately 3 hours 56 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Bozeman, MT, situated 195 miles from Grass Range, MT and 195 miles from Iona, ID. It would take 3 hours 54 mins to go from Grass Range to Bozeman and 4 hours 1 min to go from Iona to Bozeman.