The best time to visit Lake Mills is typically during the summer months, from June to August, when the weather is warm and conducive to outdoor activities, or in the fall, from September to October, for pleasant temperatures and autumn colors.Summer offers ideal conditions for enjoying Rock Lake, with opportunities for swimming, boating, and fishing. The town also hosts various community events and farmers' markets during this period. For families, the warm weather ensures kids can fully enjoy the lake and local parks.Fall brings comfortable temperatures and less humidity, making it superb for exploring the Glacial Drumlin State Trail for hiking or biking. The changing leaves around Rock Lake and throughout the surrounding Kettle Moraine State Forest provide scenic views for those seeking a relaxing getaway.