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

Distance from Harrison, SD to Forsyth, MT

Distance

548 mi

Time

10 hours 3 mins

Gas Cost

$51 - $99

There are 444.57 miles from Harrison to Forsyth in northwest direction and 548 miles (881.92 kilometers) by car, following the I-90 route.

Harrison and Forsyth are 10 hours 3 mins far apart, if you drive non-stop .

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

Please note the time difference between Harrison, SD and Forsyth, MT is 1 hour. The current time in Harrison is 6:37 am and the current time in Forsyth is 5:37 am.

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Lowest Price Rental Cars in Harrison, SD

Planning on renting a car to go from Harrison, SD to Forsyth, 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 22 gallons of gas to cover the route between Harrison, SD and Forsyth, MT.

The estimated cost of gas to go from Harrison to Forsyth is $71.75.

During the route, an average car will release 430.94 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 Forsyth, MT

If you want to meet halfway between Harrison, SD and Forsyth, MT or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 44.11803 and -103.034855, or 44º 7' 4.908" N, 103º 2' 5.478" W. This location is 273.85 miles away from Harrison, SD and Forsyth, 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 Box Elder, SD, situated 269 miles from Harrison, SD and 279 miles from Forsyth, MT. It would take 4 hours 31 mins to go from Harrison to Box Elder and 5 hours 37 mins to go from Forsyth to Box Elder.