Be prepared for additional road closures and tire chain requirements. Call 209/372-0200 (then 1, 1) to check road conditions inside Yosemite and 800/427-7623 for conditions outside Yosemite.
Source: Yosemite Phone Line

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Caltrans Area Road Conditions

Click here for Current Caltrans road conditions

Or you can also call 1-800.427.7623 for current highway conditions

Highway 41 - CHAINS ARE REQUIRED ON ALL VEHICLES EXCEPT 4-WHEEL-DRIVE VEHICLES WITH SNOW TIRES ON ALL 4 WHEELS FROM BIG CEDAR SPRINGS (MADERA CO) TO 0.5 MI SOUTH OF YOSEMITE NAT'L PARK (MARIPOSA CO)

Highway 140 - CHAINS OR SNOW TIRES ARE REQUIRED FROM THE JCT OF SR 49 TO MIDPINES (MARIPOSA CO)

Highway 120 - CHAINS ARE REQUIRED ON ALL VEHICLES EXCEPT 4-WHEEL-DRIVE VEHICLES WITH SNOW TIRES ON ALL 4 WHEELS FROM PRIEST GRADE TO 3 MI WEST OF YOSEMITE NATIONAL PARK BOUNDARY (TUOLUMNE CO)
Source: Caltrans

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TYPES OF CHAIN CONTROL

During the winter months motorists may encounter traction device controls in the mountain areas of California. When chain controls are established, signs along side the road will be opened indicating the type of requirement. There are three requirements in California.

• Requirement 1 (R1): Chains are required on all vehicles except passenger vehicles and light-duty trucks under 6,000 pounds gross weight and equipped with snow tires on at least two drive wheels. Chains must be carried by vehicles using snow tires. All vehicles towing trailers must have chains on one drive axle. Trailers with brakes must have chains on at least one axle.
  
  
• Requirement 2 (R2): Chains or traction devices are required on all vehicles except four wheel/ all-wheel drive vehicles with snow-tread tires on all four wheels.
  NOTE: (Four wheel/all-wheel drive vehicles must carry traction devices in chain control areas.)
  
  
• Requirement 3 (R3): Chains or traction devices are required on all vehicles, no exceptions.

Source: Caltrans