There is a large area of intergrdation where the two subspecies ranges meet in Iowa. These subspecies are weakly defined and specimens resembling either subspecies may be found anywhere in the state. Range Including the subspecies, the brown snake is found in all of Iowa but the northwestern third. Open grasslands with woodland borders are favored. I often find brown snakes in association with river valleys in Iowa.
Brown snakes hide under rocks, logs, and other cover.
These snakes are extremely adaptable to environmental changes and are frequently found in city parks, city lots, cemeteries, and backyards. They may be found by turning flat trash. They are generally diurnal, but I have found them at night during hot weather. These snakes vary in temperament. Most of the specimens I have encountered have been very mild mannered and made no attempt to bite.