Thereafter, it intersects Quintana Lane before intersecting several minor roads. Through a scenic and rural area, MT 69 proceeds north as South Main Street as it enters Boulder. MT 69 ends at I-15, at Boulder.
Following that, MT 69 crosses Quintana Lane and then intersects with several smaller roads. As it passes through a rural and scenic region, MT 69 becomes known as South Main Street upon entering the town of Boulder. MT 69 ultimately terminates at I-15 in Boulder.