Fallow Hollow begins in a pond in Sugarloaf Township, near Ranch Road.
It flows roughly south for less than half a mile before turning west.
The stream then flows a slightly longer distance before turning northwest and beginning to flow parallel to Ripple Brook Road.
A short distance downstream, it reaches its confluence with Coles Creek.

Fallow Hollow joins Coles Creek 2.54 miles (4.09 km) upstream of its mouth.
Fallow Hollow begins in a pond in Sugarloaf Township, near Ranch Road. It flows roughly south for less than half a mile before turning west. The stream then flows a slightly longer distance before turning northwest and beginning to flow parallel to Ripple Brook Road. A short distance downstream, it reaches its confluence with Coles Creek.
Fallow Hollow joins Coles Creek 2.54 miles (4.09 km) upstream of its mouth.
Fallow Hollow