At 2.30pm on Monday, Kosciuszko Rd was closed westbound and Guthega Rd was closed due to heavy snowfall and fallen trees.

There was also widespread power outages in the area, affecting areas including Crackenback, Moonbah and Grosses Plain.

A multi-vehicle crash on Kosciuszko Rd brought traffic to a halt on Monday morning.

Motorists reported traffic at a standstill for more than 30 minutes as emergency services cleared the scene.

There have been reports of several car accidents and fallen trees on Alpine Way and Kosciuszko Rd.

The NSW SES Snowy River unit has responded to six jobs around Cooma and Jindabyne in the past 24 hours.

There were several incidents of fallen trees and car incidents, one call out was to help motorists who were unprepared for the conditions, SES said.

"Road conditions are treacherous out there with ice, snow and rain," a post to the SES Facebook page read.

"If you are heading up to the ski fields please expect delays and take things extra slow.

"Even experienced alpine drivers in well fitted out vehicles have reported they are sliding off the road this morning."

Perisher, Thredbo and Charlotte Pass received a welcome dump of snow overnight with 35cm recorded.

The Bureau of Meteorology has forecast wild weather for much of the NSW South Coast over the coming days.

Snow is expected on the Alps on Monday above 1100m, rainfall and a possible thunderstorm are forecast for the ranges, coast and northern slopes.