It almost immediately makes a sharp right, curving northward around the eastern side of Gretna, having an intersection with Hespeler Avenue.

The highway leaves Gretna and heads due north, having a short concurrency (overlap) with PR 243 (Boundary Commission Trail) on its way to pass by Gnadenfeld, where it junctions with PR 421, and enter the town of Altona.

PTH 30 mostly bypasses the town along its eastern side, travelling through neighbourhoods and past a few businesses, where it becomes concurrent with PR 201 (Central Avenue E).

The two continue north to leave Altona, with PR 201 splitting off shortly thereafter and PTH 30 continues north for a few kilometres through farmland, crossing the Buffalo Channel, to the southern edge of Rosenfeld, where the designation comes to an end at an intersection with PTH 14.

It resides completely in the Rural Municipality of Rhineland, with the exception of the section in Altona.