Yellow River Forest Trail is a standout hiking destination in Allamakee County, Iowa, covering 8.2 miles with 420ft of elevation change. Stats: 8.2 miles, 420ft gain, Moderate. Type: Loop. Surface: Dirt. Time: 4-5 hours. Fee: Free. Dogs: Yes. Permit: No. Wildlife: white-tailed deer, wild turkeys, woodpeckers. Best seasons: Spring wildflowers are exceptional in Yellow River State Forest. Pack water, layers, and appropriate footwear. Conditions vary across Iowa. Leave No Trace: stay on trail, pack out all waste, respect wildlife.