Miles between Boulder, CO and Piedmont, CA

There are
1,240 mi
from Boulder, CO to Piedmont, CA

That's the driving distance. It would take 21 hours 22 mins to go from Boulder, Colorado to Piedmont, California.

The flight distance (direct flight from Boulder, CO to Piedmont, CA) is 922.78 mi.

1,240 mi = 1.61 kms