- Where is Slate Creek Hills located?
- Slate Creek Hills is in Amador County, United States (10915 US-290, Fredericksburg, TX 78624, Offerings: Bespoke tastings, cave tastings, and a production tour, Learn More: Check out Slate Theory Winery for events and wine club memberships., Visitor Reviews: Explore Tripadvisor for Slate Theory Winery to see why guests highly rate their underground cave experience., Tripadvisor, +3, 2. Slate Creek Ranch Vineyard (Fiddletown, California), If you are looking specifically for a vineyard with the "Slate Creek" name nestled in a hillside setting, this is a family-owned vineyard in California's Sierra Foothills).