The song features a melancholic and introspective mood in the lyrics, with the lead character, played by Cline, reflecting on her past and expressing a sense of longing for a lost lover. The melody and instrumentation, including a prominent steel guitar, create a distinct country music sound.
Cline's captivating vocal performance has been praised for bringing out the emotional depth and vulnerability in the lyrics. Her smooth and expressive voice adds to the overall impact and appeal of the song.
Walkin' After Midnight was a resounding commercial success, topping Billboard's Hot Country Songs chart in 1961. Furthermore, it managed to reach number 12 on the Billboard Hot 100, making it a crossover hit.
The song's popularity cemented Cline's status as a country music icon, and it continues to be regarded as one of the essential and timeless tracks in the genre.