MetService warns snow is expected to affect Arthur's Pass (SH73) near the summit at times this evening, overnight and Saturday morning.
Fiordland's Milford Rd could feel the brunt of a bitter front from this afternoon.
As much as 4cm of snow is likely to settle on the upper roads through to tomorrow morning.
Porters Pass and Lindis Pass should get a dusting of 1-2cm.
Snow is also expected to briefly affect the Crown Range Rd near the summit this evening.