There are
2,249 mi
from Middletown, OH to Grass Valley, CA
That's the driving distance. It would take 1 day 15 hours to go from Middletown, Ohio to Grass Valley, California.
The flight distance (direct flight from Middletown, OH to Grass Valley, CA) is 1,944.72 mi.
2,249 mi = 3,619.05 kms