The Milford Road is to close, as warm rain is set to increase the risk of an avalanche.
State Highway 94 will close be shut from the Hollyford Junction at 2pm and from the Chasm at 2.30pm as warm rain was forecast to fall on snow fields.
Not all snow fields could be cleared during avalanche control work on Saturday as the area was unstable.
The road would remain closed overnight and was likely to reopen tomorrow morning after daylight observations and avalanche assessment.
