The best time to visit Sparks, Nebraska, is during the spring and autumn months for comfortable weather, though summer offers the warmest temperatures for water activities.For those who prefer mild weather and fewer crowds, late spring (May to early June) and early autumn (September to early October) are ideal. During these periods, the temperatures are pleasant for outdoor exploration, and you'll find the area generally quieter.If you're planning to enjoy water-based activities, such as kayaking or tubing on the Niobrara River, then the summer months (July and August) are best. The water levels are typically good, and the warmer air temperatures make swimming and other river adventures more enjoyable.