Oat Hill Rd. features 17 miles of hiking trails near Calistoga, CA.
Drive North on Highway 29 from Napa to Calistoga"Approx. 20 miles from Napa" Turn Right in Calistoga at 3 way stop sign. Drive through downtown Calistoga. The trail head is located at the highway 29 and Silverado trail intersection. There is a small dirt parking area right at the intersection.
http://www.tripleblaze.com/trail.php?c=3&i=1590