Entertainment Weekly gave the song favorable reception in their review of the album, writing, "One of
Cry Prettys strangest surprises is a Florida Georgia Line-style party song called 'Southbound' that finds her singing about tan lines and 'redneck margaritas.' It's probably the most casual Underwood's ever been, and, sung by a male artist, it would have felt almost impossibly unoriginal. Recorded by a woman who doesn’t exactly make pontoon day drinking a part of her personal brand, it's pleasingly contrarian: perhaps it's Underwood trying to reclaim a style of music that's been co-opted and ridden high on the charts by the genre's leading men."
Sounds Like Nashville similarly praised the song, highlighting its "propulsive rhythm, sunny guitar riffs and breezy organ accents", also noting that it was "the first time in recent years that the Oklahoma native has offered up such a carefree track, and its good-time lyrics are all about pontoon-boat weekends, two-for-one redneck margaritas, tan lines and cheap sunglasses." Billy Dukes of
Taste of Country praised the song's melody and production, likening the latter to
Keith Urban and writing that the song is "as compelling as anything she's released in several years." ==Commercial performance==