He graduated from Gridley Union High School and attended Yuba College and Michigan State. During WWII he served as a member of the Army Air Corps stationed in Clovis, New Mexico. In 1944, he married Coragene Hamer. After the war Harold went to work in Gridley for Libby's Cannery and retired after 42 years. Harold and Coragene were active in Masons, Eastern Star, DeMolay, and Rainbow Girls. He enjoyed gardening and shared his produce with family and friends. Every year for Christmas family members could count on receiving several cases of dented cans of Libby's peaches. Even as a young boy Harold was an avid hunter and fisherman. After he married Coragene his main pursuit became the big German Browns and the Rainbow Trout in the Mill Creek canyon. Coragene's father, Clyde Hamer built a cabin at Mill Creek in 1932. As a young married couple, and for the rest of the their lives, Harold and Coragene spent as much time as possible in the mountains at the cabin. Harold wrapped his own rods and tied thousands of flies. He loved to give away his special "Mill Creek Queen" wet flies and he was happy to teach anyone his technique of fishing. He could tell you where and when the fish would be biting and he always came back with his "limit plus one". After the death of Coragene in 1990 Harold married Janet Kirch. While married to Janet he expanded his gardens to include beautiful flowers as well as vegetables. He and Janet enjoyed traveling about the states, pulling their 5th wheel traveler. But the cabin in the mountains continued to be his favorite destination. In 2004 Harold and Janet moved from Gridley to Fallon, Nevada to be near the family of Janet's son, John Kirch. After the death of Janet in 2006, Harold moved to Chico, California to be close to his family. As was true to his friendly outgoing nature, he made many new friends while living at the Sierra Sunrise Terraces. He died while residing at The Inn at the Terraces with his family by his side.

Harold is survived by his brother, Loyd Horn, sister Lyda Mae Hopkins; daughter, Sharon Tiffee; son, Rob Horn, and five grandchildren.