Miles between Boulder, CO and Modesto, CA

There are
1,231 mi
from Boulder, CO to Modesto, CA

That's the driving distance. It would take 21 hours 9 mins to go from Boulder, Colorado to Modesto, California.

The flight distance (direct flight from Boulder, CO to Modesto, CA) is 861.04 mi.

1,231 mi = 1.61 kms