while the Napa Valley Wine Worker Mural Tribute along CA Route 29 along the entrance to Napa Valley is a popular stop. This other sign called " Welcome to Napa Valley" is located up north of Napa at the Boundary of Saint Helena and Calistoga towns in the Northern Napa Valley Area. Most Wine Bus Tours don't come near this sign since most of these bus tours only tour wineries near the Napa Valley and Yountville and sometimes in Saint Helena areas and rarely in Calistoga so that they don't see this sign. That is the advantage of using a car to go to Napa Valley and Sonoma and Carneros Areas as you can have your own pace and you can visit all the wineries you like.
This welcome to Napa Valley Sign as just after the Castello Di Amarosa Winery along CA Route 29 and between the streets Larkmead Lane and Maple Lane. If you see the Sterling Vineyards Winery, this you are past this sign.
The Silverado Trail is just East of 29. Our hotel told us that we'd hit a lot of good wineries along this road and that it's not as busy of a road. We stopped at Monticello, Regusci, Stag's Leap, Silverado, Dutch Henry, Sterling, and Silver Rose. It's a very scenic route and there's at least 30 wineries right off of the road. One warning- If you're driving- locals drive very fast down this road. If you're trying to look for something or somewhere to stop- keep your eyes on whose coming up behind you. They'll run you over!