The best time to visit the River Bluffs Scenic Byway in northeast Iowa to make the most of the fall season is mid-October. Wind through the roads, admire the hills, rivers and bluffs, and enjoy the vibrant autumnal shades. You can also visit Effigy Mounds National Monument and explore the prehistoric American Indian mounds in the shapes of bears and birds while admiring the fall colors in the region. Show more