There are
1,214 mi
from Longmont, CO to Shasta Lake, CA
That's the driving distance. It would take 21 hours 3 mins to go from Longmont, Colorado to Shasta Lake, California.
The flight distance (direct flight from Longmont, CO to Shasta Lake, CA) is 907.56 mi.
1,214 mi = 1.61 kms