Idaho Falls Family Legacy Spans Aviation Pioneers and Farm Innovation Across Generations
An Idaho Falls family with roots stretching back more than a century has left a lasting mark on both American aviation and agricultural technology — a legacy that gained renewed attention following the recent death of one of the family’s last surviving members of his generation.
John Hoff, the youngest child of aviation and farming innovator J. Mark Hoff, died May 23 at age 79 after a prolonged battle with cancer. His passing prompted a fresh look at the remarkable story of a family whose history has intersected with some of the defining moments of 20th-century America.
A Crash Landing on the Day That Changed History
The Hoff family story takes on a particularly dramatic dimension when you consider where Mark Hoff was on December 7, 1941. That morning, Mark and fellow pilot Rudolph Nelson were attempting to land their L-2 Grasshopper aircraft at the Idaho Falls Airport during a heavy snowstorm. Struggling to see through the weather, they used runway lights as a guide but came down on the wrong side of the strip, touching down in deep snow. The aircraft flipped upside down when the propeller dug into the ground. Both men crawled out without injury.
What struck them next was the silence — no one came to help. Walking inside, they discovered everyone gathered around a radio. Japan had just attacked Pearl Harbor, drawing the United States into World War II.
The propeller that broke in that landing was later fashioned into a clock and displayed as part of an aviation exhibit at the Museum of Idaho in 2024.
The attack galvanized Mark. Though he attempted to enlist in the U.S. Army Air Corps, the military considered him too old at 43. He turned instead to the Auxiliary Air Corps — the organization that would evolve into the Civil Air Patrol. Mark and his wife, Onita, became early pillars of that organization, flying civilian missions and working to advance aviation in their community. Mark was posthumously recognized with the Congressional Medal of Honor and the Presidential Medal of Freedom, according to his son Bob, though the family acknowledges that records from that era are incomplete and some details have been difficult to verify independently.
Farm Inventions That Reshaped Agriculture
Aviation was only one dimension of Mark Hoff’s legacy. He also developed patents for three pieces of farm machinery: a potato harvester, a hydraulic loader, and the backhoe. His son Bob, now 85, says the inventions grew out of a straightforward desire to make farm work more efficient.
Mark had demonstrated an early aptitude for technical problem-solving. By 1919, he was transmitting and receiving Morse code across the country as a ham radio operator — years before radio was commonplace.
His agricultural patents brought results, though credit has sometimes been complicated to assign. According to Bob, a competitor company examined Mark’s loader patent closely enough to design around it without technically infringing. “They copied him closely so that they didn’t infringe on the patent, but the loader they came out with was just about the same thing,” Bob said. One family member believes Mark’s design became the basis for the FarmHand loader, though Bob acknowledges that firm attribution is difficult given the limited record-keeping of the time.
On the potato harvester, Mark collaborated with a local company that manufactured his design and sold it to farmers across the country. That company reportedly continued producing the harvesters until roughly two decades ago. Profit, Bob notes, was never the primary motivation. “People who are creative tend to work on something until they know that it works, and then they move on,” Bob explained.
The agricultural heritage traces back even further. Mark’s father, Rasmus Hoff, purchased the original 1,600 acres of farmland in 1903 — the same year Orville and Wilbur Wright completed the world’s first successful powered flight. The family’s 2,800-acre operation now sits south of Idaho Falls and includes a private hangar and airstrip.
A Flying Family Carries the Tradition Forward
Bob Hoff is a licensed pilot and president of Aeromark, a commercial aviation service business in Idaho Falls he co-founded with his late brother John. Bob’s sons, Thomas and James, are also pilots, continuing a tradition now spanning at least four generations. Each summer, the Hoff property hosts a gathering for pilots and aviation enthusiasts.
“Some families fish, some hunt and some snowmobile and motorboat. We’re a flying family,” Bob said.
For those interested in the intersection of local heritage, agriculture, and aviation history, the intersection of art and farming is also alive in the Idaho Falls community, where local events continue to celebrate the region’s rural roots.
What Comes Next
With John Hoff’s passing, the family’s elder generation has grown smaller. Bob Hoff continues to operate Aeromark and maintain the family farm and airstrip south of Idaho Falls. The annual aviation gathering on the Hoff property is expected to continue as a tradition for the local flying community. The broken propeller clock and Mark Hoff’s medals, previously featured in a Museum of Idaho aviation exhibit, stand as tangible reminders of a family whose ambitions — in the cockpit and in the field — helped shape the region’s history.