There are
2,038 mi
from Oshkosh, WI to Grass Valley, CA
That's the driving distance. It would take 1 day 11 hours to go from Oshkosh, Wisconsin to Grass Valley, California.
The flight distance (direct flight from Oshkosh, WI to Grass Valley, CA) is 1,700.54 mi.
2,038 mi = 3,279.58 kms