Born in Billings, Montana, he was raised on a sheep ranch near Lodge Grass. He attended the University of Montana in Missoula and now lives in Helena. In 1958, Lynde created the comic strip Rick O'Shay, a critical and commercial success. Like most of his work, it was set in the West and mixed humor with strong storytelling. After a dispute with the syndicate, Lynde left the strip in 1977. The strip continued, drawn by Alfredo Alcala.
In 1979, Lynde launched another strip, Latigo, starring Cole "Latigo" Cantrell, aka "Two Trails". His father was a mountain man and his mother a Crow Indian. After serving in the Union Army during the Civil War, Latigo returned to the West and became a federal marshal. The daily strip was launched on June 25, 1979, joined by a Sunday strip, best seen in the half page format, on 1 July 1979. It was not a great commercial success and ended in 1983, the daily on May 7, the Sunday on 5 June.
Denis Mayer Jr