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

Distance from Boulder, MT to Ault, CO

Distance

719 mi

Time

12 hours 34 mins

Gas Cost

$67 - $130

There are 538.21 miles from Boulder to Ault in southeast direction and 719 miles (1,157.12 kilometers) by car, following the US-87 route.

Boulder and Ault are 12 hours 34 mins far apart, if you drive non-stop .

This is the fastest route from Boulder, MT to Ault, CO. The halfway point is Parkman, WY.

Boulder, MT and Ault, CO are in the same time zone (MDT). Current time in both locations is 12:01 am.

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Lowest Price Rental Cars in Boulder, MT

Planning on renting a car to go from Boulder, MT to Ault, CO? 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 28.87 gallons of gas to cover the route between Boulder, MT and Ault, CO.

The estimated cost of gas to go from Boulder to Ault is $94.16.

During the route, an average car will release 565.55 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 Boulder, MT and Ault, CO

If you want to meet halfway between Boulder, MT and Ault, CO or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 44.995960 and -107.250580, or 44º 59' 45.456" N, 107º 15' 2.088" W. This location is 359.38 miles away from Boulder, MT and Ault, CO and it would take approximately 6 hours 17 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Parkman, WY, situated 333 miles from Boulder, MT and 392 miles from Ault, CO. It would take 5 hours 42 mins to go from Boulder to Parkman and 6 hours 21 mins to go from Ault to Parkman.