There are
2,319 mi
from Gallatin, TN to Piedmont, CA
That's the driving distance. It would take 1 day 16 hours to go from Gallatin, Tennessee to Piedmont, California.
The flight distance (direct flight from Gallatin, TN to Piedmont, CA) is 1,962.31 mi.
2,319 mi = 3,731.51 kms