Unfortunately, not all of the wine trails are listed in one, easy-to-search place. Until now.
I don’t know if this is a “trail,” per se, but I found it on Wine Country Getaways. The site is, as expected, primarily focused on Sonoma and Napa, as well as other Wine Countries throughout the U.S.
The drive from Paso Robles on Hwy 46 West to Hwy 1 is a beautiful one in the Spring, and you just have to visit them. The trip is more than worth it, and depending upon your dedication to speed limits, may only take about 20 minutes.