Distance between cities › USA › Montana › Forest Grove, MT › Distance from Forest Grove to Gregory Book Hotels

Distance from Forest Grove, MT to Gregory, SD

Distance

673 mi

Time

13 hours 4 mins

Gas Cost

$63 - $122

There are 536.83 miles from Forest Grove to Gregory in southeast direction and 673 miles (1,083.09 kilometers) by car, following the I-90 and US-14 and US-16 Truck and SD 79 route.

Forest Grove and Gregory are 13 hours 4 mins far apart, if you drive non-stop .

This is the fastest route from Forest Grove, MT to Gregory, SD.

Please note the time difference between Forest Grove, MT and Gregory, SD is 1 hour. The current time in Forest Grove is 8:45 am and the current time in Gregory is 9:45 am.

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Lowest Price Rental Cars in Forest Grove, MT

Planning on renting a car to go from Forest Grove, MT to Gregory, SD? Here there are some offers to rent a car in Forest Grove, MT

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Forest Grove »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 27.02 gallons of gas to cover the route between Forest Grove, MT and Gregory, SD.

The estimated cost of gas to go from Forest Grove to Gregory is $88.14.

During the route, an average car will release 529.36 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 Forest Grove, MT and Gregory, SD

If you want to meet halfway between Forest Grove, MT and Gregory, SD or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 45.086998 and -104.530814, or 45º 5' 13.1928" N, 104º 31' 50.9304" W. This location is 336.39 miles away from Forest Grove, MT and Gregory, SD and it would take approximately 6 hours 32 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Alzada, MT, situated 343 miles from Forest Grove, MT and 330 miles from Gregory, SD. It would take 6 hours 57 mins to go from Forest Grove to Alzada and 6 hours 8 mins to go from Gregory to Alzada.