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

Distance from Boulder, MT to Big Sandy, MT

Distance

196 mi

Time

3 hours 21 mins

Gas Cost

$18 - $35

There are 163.95 miles from Boulder to Big Sandy in northeast direction and 196 miles (315.43 kilometers) by car, following the I-15 route.

Boulder and Big Sandy are 3 hours 21 mins far apart, if you drive non-stop .

This is the fastest route from Boulder, MT to Big Sandy, MT. The halfway point is Ulm, MT.

Boulder, MT and Big Sandy, MT are in the same time zone (MDT). Current time in both locations is 1:43 am.

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Lowest Price Rental Cars in Boulder, MT

Planning on renting a car to go from Boulder, MT to Big Sandy, 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 7.85 gallons of gas to cover the route between Boulder, MT and Big Sandy, MT.

The estimated cost of gas to go from Boulder to Big Sandy is $25.32.

During the route, an average car will release 153.84 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 Big Sandy, MT

If you want to meet halfway between Boulder, MT and Big Sandy, MT or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 47.422180 and -111.523239, or 47º 25' 19.848" N, 111º 31' 23.6604" W. This location is 97.76 miles away from Boulder, MT and Big Sandy, MT and it would take approximately 1 hour 40 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Ulm, MT, situated 106 miles from Boulder, MT and 90 miles from Big Sandy, MT. It would take 1 hour 52 mins to go from Boulder to Ulm and 2 hours 11 mins to go from Big Sandy to Ulm.