From Caltrans road report for 395 this morning --

CHAINS OR SNOW TIRES ARE REQUIRED FROM 8 MI NORTH OF THE JCT OF SR 203 TO 2 MI SOUTH OF THE JCT OF SR 158 (MONO CO)

395 is the main north-south road up the Owens Valley and into Nevada east of the Sierra. 203 is the road into Mammoth Lakes that ends in the winter at the Mammoth Main Lodge. 158 is the road through June Lake to June Mt.