Distance between cities › USA › Montana › Boulder, MT › Distance from Boulder to Capitol Book Hotels

Distance from Boulder, MT to Capitol, MT

Distance

486 mi

Time

10 hours 2 mins

Gas Cost

$45 - $87

There are 391.55 miles from Boulder to Capitol in east direction and 486 miles (782.14 kilometers) by car, following the I-90 route.

Boulder and Capitol are 10 hours 2 mins far apart, if you drive non-stop .

This is the fastest route from Boulder, MT to Capitol, MT. The halfway point is Huntley, MT.

Boulder, MT and Capitol, MT are in the same time zone (MDT). Current time in both locations is 1:34 am.

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Lowest Price Rental Cars in Boulder, MT

Planning on renting a car to go from Boulder, MT to Capitol, MT? Here there are some offers to rent a car in Boulder, MT

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Boulder »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 19.50 gallons of gas to cover the route between Boulder, MT and Capitol, MT.

The estimated cost of gas to go from Boulder to Capitol is $62.90.

During the route, an average car will release 382.12 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 $3.23 per gallon of regular gas. Price last updated on March 13, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Boulder, MT and Capitol, MT

If you want to meet halfway between Boulder, MT and Capitol, MT or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 45.776134 and -108.178352, or 45º 46' 34.0824" N, 108º 10' 42.0672" W. This location is 242.82 miles away from Boulder, MT and Capitol, MT and it would take approximately 5 hours 1 min to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Huntley, MT, situated 240 miles from Boulder, MT and 261 miles from Capitol, MT. It would take 3 hours 56 mins to go from Boulder to Huntley and 6 hours 45 mins to go from Capitol to Huntley.

Major City Closest to Halfway Point

The major city closest to the halfway point between Boulder, MT and Capitol, MT is Billings, MT, situated 226 miles from Boulder, MT and 260 miles from Capitol, MT. It would take 3 hours 41 mins to go from Boulder to and 6 hours 44 mins to go from Capitol to Billings.