The best time to visit Gillham, Arkansas, is during the spring (April to May) and fall (September to October) months, when the weather is most pleasant for outdoor activities.
During these periods, the temperatures are moderate, making it comfortable for exploring the natural beauty of the region, such as hiking the trails around the Cossatot River State Park-Natural Area or enjoying fishing and kayaking on the numerous local lakes and rivers. The spring brings blooming wildflowers, while the fall offers colorful foliage, enhancing the scenic drives.
Summer (June to August) can be quite warm and humid, though it's still a popular time for water-based recreation.