Wendelin Grimm was born October 18, 1818 in Kulsheim, Baden, Germany, to Valentine and Marie (Adelmann) Grimm. He grew up in a farm rich area of southern Germany, learning important crops and farming practices. In 1845, Grimm married Julianna Segner (born June 15, 1821) of Steinback, Baden, Germany. The Grimms chances to own a farm were limited by the land inheritance practices of the time. Farming and crop prices were under pressure, and their future in Germany looked grim.