Distance between cities › USA › South Dakota › Harrison, SD › Distance from Harrison to Augusta Book Hotels

Distance from Harrison, SD to Augusta, MT

Distance

865 mi

Time

15 hours 47 mins

Gas Cost

$81 - $157

There are 726.89 miles from Harrison to Augusta in northwest direction and 865 miles (1,392.08 kilometers) by car, following the I-90 route.

Harrison and Augusta are 15 hours 47 mins far apart, if you drive non-stop .

This is the fastest route from Harrison, SD to Augusta, MT.

Please note the time difference between Harrison, SD and Augusta, MT is 1 hour. The current time in Harrison is 3:45 am and the current time in Augusta is 2:45 am.

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Lowest Price Rental Cars in Harrison, SD

Planning on renting a car to go from Harrison, SD to Augusta, MT? Here there are some offers to rent a car in Harrison, SD

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Harrison »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 34.74 gallons of gas to cover the route between Harrison, SD and Augusta, MT.

The estimated cost of gas to go from Harrison to Augusta is $113.31.

During the route, an average car will release 680.54 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 Harrison, SD and Augusta, MT

If you want to meet halfway between Harrison, SD and Augusta, MT or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 45.480119 and -105.600166, or 45º 28' 48.4284" N, 105º 36' 0.5976" W. This location is 432.46 miles away from Harrison, SD and Augusta, MT and it would take approximately 7 hours 53 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Olive, MT, situated 435 miles from Harrison, SD and 443 miles from Augusta, MT. It would take 7 hours 41 mins to go from Harrison to Olive and 8 hours 26 mins to go from Augusta to Olive.