Fermentation Fest is a 10-day celebration of farming, food, and art in Reedsburg, Wisconsin. It was established in 2010 based on a Smithsonian Institution travelling exhibit titled "Key Ingredients: America by Food" and includes classes, the Farm/Art DTour (a self-guided driving tour on 50 miles of Wisconsin backroads including signposts), art installations, market stands and live performances. Cheesemakers, beekeepers, composters, picklers, organic farmers, writers, and sculptors take part. There are hay bale sculptures. Venues involved include the historic Touchdown Tavern and Wormfarm Institute.
It is funded with National Endowment for the Arts and ArtPlace grant money, as well as funding from Sauk County's tourism department, and the State of Wisconsin's tourism department. which is touting the event throughout the Midwest. The event is run in conjunction with Sauk County's long-standing Fall Art Tour of art gallery exhibitions and the Mid-Continent Railway Museum's seven-mile Autumn Color Railroad Tour in the Baraboo Hills.