The highway connects rural areas of Hardin and Meade counties with Radcliff and Vine Grove.

KY 313 begins at an interchange with Interstate 65 (I-65) in the southeastern part of Fort Knox, within Hardin County.

It then crosses over Cedar Creek and then curves to the west-southwest before it has an intersection with the northern terminus of KY 251 (Shepherdsville Road).

They curve to the west-northwest, intersect the southern terminus of KY 1815 (West Lincoln Trail Boulevard) and cross over some railroad tracks of the Paducah & Louisville Railway.

At this point, they travel in a nearly due west direction and have a second intersection with KY 1500 (Knox Avenue).

They continue to the northwest and intersect the eastern terminus of KY 333 (Big Spring Road).

[5] The original KY 313 ran from the Tennessee State Line northward via Kentucky Bend Road in far west Fulton County.