How to get to Sierra County
From Truckee take Hwy 89 north to Hwy 49.
From Reno take I-80 west to Truckee then Hwy 89 north to Hwy 49, or alternatively, take Hwy 395 north to Hwy 70 west to Hwy 49 south.
From the Bay Area or Sacramento take I-80 east to Auburn then Hwy 49 north through Grass Valley.
Highways 49 & 89 are open all year even when interstates are closed due to snow conditions. During fall, winter and spring call Caltrans at 1-800-427-7623 for current road conditions.
You can always check online for road conditions and restrictions like chain control:
Highway 49
Highway 89
While exploring Sierra County, if you want to travel on unpaved roads, it is recommended that you drive a high clearance vehicle.