Forst became "Frosty" in 1960, when he was hired by CFUN. There, he teamed up with Al Jordon, Dave McCormick, Ken Chang and Brian Lord to become the Good Guys, who were on air 24 hours a day with modern music, bringing the local radio market into the modern world.
Within three years, many of the CFUN staff had taken jobs elsewhere. Forst, following his father's advice, sought a position at CKNW, where he was hired by program director Hal Davis in 1964. From there he advanced to a million-dollar contract, a vast audience, and 31 years as CKNW's morning air personality. His ratings in Canada remain unsurpassed.
Forst's personal life has been turbulent. He has had a number of marriages and other romantic relationships, and sired a second family late in life. Throughout his career, he had public-relations issues (he ended his final shift at CKNW without indicating to his listeners that he was retiring), but his fans stayed faithful and his popularity seldom wavered.