Hiawatha is a city located in Linn County, Iowa. It has a humid continental climate with hot summers and cold winters. The city lies on the Cedar River and has several ponds and wetlands, making it susceptible to flooding. Hydrology constituents in the area include nitrates, pesticides, and sediment runoff from agricultural fields. Hiawatha has several parks and outdoor recreation opportunities, including the Cedar Valley Nature Trail, which is ideal for hiking, biking, and birdwatching. The city also has a disc golf course, a skate park, and a community pool.