Four Star Mushrooms at Open House Chicago

Four Star Mushrooms is the most urban mushroom farm in the country. A specialty growing operation inside a 1965 industrial building in West Town, converted in 2022 into a working farm of sterile labs and climate-controlled grow rooms. Within the facility, a long corridor runs between rooms where airflow, humidity, and CO₂ are tuned varietal by varietal, and spent growing substrate leaves as soil amendment to help other regenerative producers. The mushrooms go to Michelin-starred kitchens, to the kitchen of FX's The Bear, and to grocery shelves across Chicagoland. And through the farm's direct-to-consumer Mushroom Club. Visitors can walk the grow-room corridor and see a controlled environment agriculture operation up close, with staff on hand to answer questions. Fresh mushroom punnets, mushroom coffee, and pastries from local bakers are available for purchase, along with Four Star shirts and hats. And Mushroom Club memberships. Please wear closed-toe shoes.