Poison hemlock is found in nearly every state in the US, with the exception of Alaska, Florida, Hawaii, and Mississippi, according to the USDA. It is commonly found in moist environments like roadsides, ditches, and edges of fields.
Common Habitats: Poison hemlock thrives in moist, disturbed areas like roadsides, ditches, field edges, and waste areas.....below 5000 feet, excluding desert regions, and prefers disturbed areas with some moisture and shade. It can be found in various locations, including fence lines, irrigation ditches, and other moist, waste places.