Born and raised in Bend, Oregon. He has a younger brother named Mike Cashman who was drafted by the Los Angeles Lakers, who formerly worked as a substitute teacher in the Mukilteo School District and coached the 8th grade Explorer Middle School basketball team. Cashman graduated from Bend High School in 1968 and majored in journalism and communications at the University of Portland.

Cashman moved to KING-TV in Seattle in 1980, where he again worked in making local commercials, including spots for the Seattle Mariners baseball team. He was a regular cast member of the long-running local comedy show Almost Live! with his co-star John Keister, as well as the announcer for Bill Nye the Science Guy. On radio, he has hosted the Pat Cashman Show, a morning drive-time show on several Seattle stations, and his familiar bassy voice is heard in local commercials. Among the local commercials he voices are the commercials for Jerry's Hardware in Eugene and Springfield, Oregon—and Grover's Electric and Plumbing with multiple Northwest locations. He is featured in Super Smash Bros. Brawl for Wii as the game's announcer, Master Hand, and Crazy Hand.


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