- Southern Terminus:
- Danbury Road (US 7) in Wilton
- Northern Terminus:
- Black Rock Turnpike (CT 58) in Redding
- 7.50 miles
CT 107 is a diagonal north/south route extending from Wilton to Redding. It begins at Norwalk-Danbury Road (US 7) and is wrong-way multiplexed with CT 57 along School Street and Redding Road for about half a mile. Then, CT 57 splits off to the south onto Georgetown Road, while Redding Road continues north to Redding, where it merges with Glen Road (CT 53). The two routes are multiplexed along Redding Road across the Saugatuck River. On the other side, they split. CT 53 follows Redding Road, while CT 107 splits off to the northeast, following Lonetown Road and Putnam Park Road to end at Black Rock Turnpike (CT 58) near Putnam Memorial State Park.