The road continues past the Wilbur Cross Parkway for another  until the intersection with Route 34 (Derby Turnpike) in the northern edge of Orange, where Route 121 ends. In Milford, Route 121 is known as North Street, while in Orange, it is known as Grassy Hill Road.
The road continues past the Wilbur Cross Parkway for a stretch until it reaches an intersection with Route 34 (Derby Turnpike) at the northern edge of Orange, where Route 121 ends. In Milford, Route 121 is called North Street, while in Orange, it's known as Grassy Hill Road.