LOS ANGELES (AP) — The major route between Southern and Central California is reopened after being shut down overnight because of heavy snow and ice from a winter storm that sent temperatures plunging.

The California Highway Patrol began escorting groups of motorists through the Grapevine section of Interstate 5 just before 7:30 a.m. Sunday. The steep, winding roadway at the 4,160-foot-high Tejon Pass was completely opened about an hour later.

READ MORE: 1 Killed, 2 Others Severely Injured In Separate Jefferson Park Hit-And-Run Crashes Over 2 Weeks

Overnight lows in the area near the Kern County line were in the 20s.

In the Los Angeles basin, temperatures dipped into 30s and caused weather officials to issue a frost advisory for the San Fernando and San Gabriel valleys.

READ MORE: Orange County Deputies Open Fire Inside Foothill Ranch Walmart, Suspect Wounded

A dusting of snow fell in Studio City, Altadena, Pasadena Burbank, Santa Clarita and many other areas unaccustomed to seeing flakes.

The skies will be clear for Sunday night’s Academy Awards, but the red carpet will likely be chilly.

MORE NEWS: LA Councilman Seeks Funding To Crack Down On Street Racing In San Fernando Valley

(© Copyright 2011 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)