Placer Big Trees grove is the most northerly stand of naturally occurring Giant Sequoias, Sequoiadendron giganteum, and is found 22 miles east of Foresthill overlooking the Middle Fork American River. This area has been designated as a Botanical Special Interest Area by the Forest Service. The trees have been a popular tourist attraction since the 1800s and each bears the name of a prominent American. A nature trail and picnic area offer visitors a nice lunch or rest stop.
This is a great day trip out of Reno, Carson City or Sacramento area. Here is a review from a local writer in the area: http://www.calexplornia.com/big-trees-grove-placer-countys-giant-sequoia-anomaly/
From Sacramento Take I-80 to Forest Hill Rd exit outside of Auburn, drive roughly 17 mile til you reach town of Foresthill. Make a right on Mosquito Ridge Road, then follow curvy road for approx 25 miles, Take right onto Forest Rd 16.