That depends on what activities you want to focus on. If you’re desirous of waterpark life, then the BEST time to go is offseason, as many of the waterparks are indoors, and you’ll have fewer crowds in the winter! You’ll also score better deals. However, if you’re wanting to ensure there is snow for skiing or tubing, Dec- Feb are your best months. Before that or after that, you can’t guarantee a frozen wonderland. If hiking and lake life is what you’re after, spring and fall are your best options, because the air won’t be as sticky as the summer, but you won’t freeze your tail off in the winter, either. So, you can visit the Dells at any time! Just adjust your activities to get the best experience.