One of the smaller snakes in Minnesota is the red-bellied snake, Storeria occipitomaculata. These harmless snakes only get to be from 8-10 inches long, compare the size to my hand in the photo below. They are a wood snake that is often prey for birds, mammals, and larger snakes. They eat worms, snails, slugs and insects.
Even though they are pretty plain looking and similar looking to the brown snake the scales on their under side are, as their name would suggest red or orange in color.