Garden Prairie, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Garden Prairie, Illinois, United States, is known for its proximity to the Boone County Fairgrounds, which hosts various local events and fairs. The best time to travel to Garden Prairie, United States, is in late spring (May), when the average air temperature is around 65°F (18°C) and water temperature is not applicable as it is a landlocked area. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!