Spring (April-May): The weather starts to warm up in the spring, and the crowds start to thin out. This is a great time to visit if you want to avoid the summer crowds.
Fall (September-October): The weather is still mild in the fall, and the crowds are even smaller. This is a great time to enjoy the natural beauty of the Dells without the hustle and bustle of the summer season.
Winter (November-March): The weather is cold in the winter, but there are still plenty of activities to enjoy, such as skiing, snowboarding, and ice skating. This is a great time to visit if you're looking for a more relaxed and affordable vacation.