There are
1,779 mi
from Waterloo, IA to Grass Valley, CA
That's the driving distance. It would take 1 day 6 hours to go from Waterloo, Iowa to Grass Valley, California.
The flight distance (direct flight from Waterloo, IA to Grass Valley, CA) is 1,510.34 mi.
1,779 mi = 2,862.68 kms