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

Distance from Boulder, MT to Helena, MT

Distance

30 mi

Time

32 minutes

Gas Cost

$3 - $5

There are 24.73 miles from Boulder to Helena in north direction and 30 miles (48.28 kilometers) by car, following the I-15 route.

Boulder and Helena are 32 minutes far apart, if you drive non-stop .

This is the fastest route from Boulder, MT to Helena, MT. The halfway point is Clancy, MT.

Boulder, MT and Helena, MT are in the same time zone (MDT). Current time in both locations is 9:39 pm.

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Lowest Price Rental Cars in Boulder, MT

Planning on renting a car to go from Boulder, MT to Helena, 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 1.19 gallons of gas to cover the route between Boulder, MT and Helena, MT.

The estimated cost of gas to go from Boulder to Helena is $3.81.

During the route, an average car will release 23.24 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 $3.21 per gallon of regular gas. Price last updated on March 12, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Boulder, MT and Helena, MT

If you want to meet halfway between Boulder, MT and Helena, MT or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 46.427456 and -111.996269, or 46º 25' 38.8416" N, 111º 59' 46.5684" W. This location is 14.77 miles away from Boulder, MT and Helena, MT and it would take approximately 16 minutes to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Clancy, MT, situated 18 miles from Boulder, MT and 12 miles from Helena, MT. It would take 22 minutes to go from Boulder to Clancy and 14 minutes to go from Helena to Clancy.