Coulter, a small town in north-central Iowa, experiences a humid continental climate, with hot summers and cold winters. The area is dominated by agriculture, with corn and soybeans being the major crops. The town is located in the Boone River Watershed, with the river flowing through the town. The water quality in the watershed is monitored by the Iowa Department of Natural Resources, with nitrate and phosphorus being the major constituents of concern. The town has a few parks and recreational areas, including the Coulter City Park and the nearby Rowan Wildlife Area, which offers opportunities for fishing, hunting, hiking, and birdwatching.