There are
1,910 mi
from Harlingen, TX to Gilroy, CA
That's the driving distance. It would take 1 day 9 hours to go from Harlingen, Texas to Gilroy, California.
The flight distance (direct flight from Harlingen, TX to Gilroy, CA) is 1,584.78 mi.
1,910 mi = 3,073.18 kms