In 1942, Seaborg married Helen Griggs, the secretary of physicist Ernest Lawrence.
Under wartime pressure, Seaborg had moved to Chicago while engaged to Griggs.
When Seaborg returned to accompany Griggs for the journey back to Chicago, friends expected them to marry in Chicago.
But, eager to be married, Seaborg and Griggs impulsively got off the train in the town of Caliente, Nevada, for what they thought would be a quick wedding.
When they asked for City Hall, they found Caliente had none—they would have to travel 25 miles (40 km) north to Pioche, the county seat.
With no car, this was no easy feat, but one of Caliente's newest deputy sheriffs turned out to be a recent graduate of the Cal Berkeley chemistry department and was more than happy to do a favor for Seaborg.
The deputy sheriff arranged for the wedding couple to ride up and back to Pioche in a mail truck.
The witnesses at the Seaborg wedding were a clerk and a janitor.
Glenn Seaborg and Helen Griggs Seaborg had seven children, of whom the first, Peter Glenn Seaborg, died in 1997 (his twin Paulette having died in infancy).
The others were Lynne Seaborg Cobb, David Seaborg, Steve Seaborg, Eric Seaborg, and Dianne Seaborg.

Seaborg was an avid hiker.
Upon becoming Chairman of the Atomic Energy Commission in 1961, he commenced taking daily hikes through a trail that he blazed at the headquarters site in Germantown, Maryland.
He frequently invited colleagues and visitors to accompany him, and the trail became known as the "Glenn Seaborg Trail."
He and his wife Helen are credited with blazing a 12-mile (19 km) trail in the East Bay area near their home in Lafayette, California.
This trail has since become a part of the American Hiking Association's cross-country network of trails.
Seaborg and his wife walked the trail network from Contra Costa County all the way to the California–Nevada border.

Seaborg was elected a foreign member of the Royal Swedish Academy of Sciences in 1972 and a Foreign Member of the Royal Society (ForMemRS) of London in 1985.
He was honored as Swedish-American of the Year in 1962 by the Vasa Order of America.
In 1991, the organization named "Local Lodge Glenn T. Seaborg No.
719" in his honor during the Seaborg Honors ceremony at which he appeared.
This lodge maintains a scholarship fund in his name, as does the unrelated Swedish-American Club of Los Angeles.

Seaborg kept a close bond to his Swedish origin.
He visited Sweden every so often, and his family were members of the Swedish Pemer Genealogical Society, a family association open for every descendant of the Pemer family, a Swedish family with German origin, from which Seaborg was descended on his mother's side.

On August 24, 1998, while in Boston to attend a meeting by the American Chemical Society, Seaborg suffered a stroke, which led to his death six months later on February 25, 1999, at his home in Lafayette.
In 1942, Seaborg married Helen Griggs, the secretary of physicist Ernest Lawrence. Under wartime pressure, Seaborg had moved to Chicago while engaged to Griggs. When Seaborg returned to accompany Griggs for the journey back to Chicago, friends expected them to marry in Chicago. But, eager to be married, Seaborg and Griggs impulsively got off the train in the town of Caliente, Nevada, for what they thought would be a quick wedding. When they asked for City Hall, they found Caliente had none—they would have to travel 25 miles (40 km) north to Pioche, the county seat. With no car, this was no easy feat, but one of Caliente's newest deputy sheriffs turned out to be a recent graduate of the Cal Berkeley chemistry department and was more than happy to do a favor for Seaborg. The deputy sheriff arranged for the wedding couple to ride up and back to Pioche in a mail truck. The witnesses at the Seaborg wedding were a clerk and a janitor. Glenn Seaborg and Helen Griggs Seaborg had seven children, of whom the first, Peter Glenn Seaborg, died in 1997 (his twin Paulette having died in infancy). The others were Lynne Seaborg Cobb, David Seaborg, Steve Seaborg, Eric Seaborg, and Dianne Seaborg.
Seaborg was an avid hiker. Upon becoming Chairman of the Atomic Energy Commission in 1961, he commenced taking daily hikes through a trail that he blazed at the headquarters site in Germantown, Maryland. He frequently invited colleagues and visitors to accompany him, and the trail became known as the "Glenn Seaborg Trail." He and his wife Helen are credited with blazing a 12-mile (19 km) trail in the East Bay area near their home in Lafayette, California. This trail has since become a part of the American Hiking Association's cross-country network of trails. Seaborg and his wife walked the trail network from Contra Costa County all the way to the California–Nevada border.
Seaborg was elected a foreign member of the Royal Swedish Academy of Sciences in 1972 and a Foreign Member of the Royal Society (ForMemRS) of London in 1985. He was honored as Swedish-American of the Year in 1962 by the Vasa Order of America. In 1991, the organization named "Local Lodge Glenn T. Seaborg No. 719" in his honor during the Seaborg Honors ceremony at which he appeared. This lodge maintains a scholarship fund in his name, as does the unrelated Swedish-American Club of Los Angeles.
Seaborg kept a close bond to his Swedish origin. He visited Sweden every so often, and his family were members of the Swedish Pemer Genealogical Society, a family association open for every descendant of the Pemer family, a Swedish family with German origin, from which Seaborg was descended on his mother's side.
On August 24, 1998, while in Boston to attend a meeting by the American Chemical Society, Seaborg suffered a stroke, which led to his death six months later on February 25, 1999, at his home in Lafayette.
Glenn T. Seaborg