KRTH Los Angeles: Oldest FM and most popular

KRTH Los Angeles radio has proven that age is no barrier to success. The station, which first went on air in 1941 as K45LA, is the oldest continuously operating FM station in Southern California. More than 80 years later, KRTH — known as “K-Earth 101” — has become Los Angeles’ top-rated radio station, blending history with modern programming.

From K45LA to K-Earth 101

When K45LA launched on August 11, 1941, it broadcast at 44.5 MHz, making it the city’s first FM station. After the FCC reassigned FM to today’s 88–108 MHz spectrum, the station moved to 99.7 MHz in 1946, before settling at 101.1 in 1947. Originally simulcasting its AM sister station KHJ, FM struggled to build an audience until new FCC rules in 1968 forced stations to develop unique content.

That shift gave birth to KRTH’s famous formats, beginning with “Hit Parade” in the late 1960s and later “Solid Gold Rock and Roll.” By 1972, the rebranded “K-Earth 101” launched its oldies sound, just as nostalgia culture surged with films like American Graffiti and TV shows like Happy Days.

Evolution of the playlist

KRTH has always adjusted its playlist to remain relevant. In the 1970s and early ’80s, it mixed current hits with oldies, offering themed weekends like “Souvenir of the ’70s.” By 1984, it returned to a full-time oldies format but continued adding more recent decades as time passed. Today, the focus is on music from the 1980s through the early 2000s, aligning with listener nostalgia while keeping the format fresh.

This adaptability reflects KRTH’s programming philosophy: the oldest song on the playlist in 1972 was 17 years old, compared with today’s songs, which are 20–35 years old. The jingles, personalities, and presentation also evolve to match listener expectations, ensuring continuity across generations.

KRTH’s modern success

Under Program Director Chris Ebbott, KRTH has reached record highs. In the July Nielsens, it secured a 7.4 audience share — more than a full point ahead of rival KOST 103.5. The station now leads across nearly every demographic.

A strong lineup of hosts helps sustain its popularity. Gary Bryan and Lisa Stanley anchor mornings, followed by Lara Scott, Greg Simms, and Larry Morgan on weekdays. Kevin Schatz, Renee Taylor, and Dave Styles cover weekends and fill-ins. Their mix of entertainment and music keeps audiences engaged, even as contests and promotions have been scaled back.

Legacy of Los Angeles radio

From its beginnings as K45LA to its dominance today, KRTH Los Angeles radio embodies the evolution of FM broadcasting. Its success is not based on luck but on constant reinvention, strong on-air personalities, and careful programming choices. More than eight decades later, KRTH remains not only a piece of history but also a leader in Los Angeles media — proving that heritage stations can thrive in a modern market.