Heidel House Resort & Spa

Heidel House Resort & Spa sits directly on the shore of Green Lake — at 237 feet, Wisconsin's deepest natural inland lake and one of the clearest in the Midwest. The resort's full-service spa includes sauna and steam with lake views, set in a property that has anchored Green Lake's resort identity since the 1940s. The combination of a genuinely exceptional lake — cold, clear, glacier-carved, large enough for sailing — and a full spa sauna program creates a Wisconsin wellness experience that differs meaningfully from the Northwoods traditions of the Bayfield peninsula or the Door County coast. Green Lake's depth means the swimming is cold enough for a genuine contrast plunge even in midsummer.