Developed as the spin-off of Laguna Beach: The Real Orange County, the series aired six seasons and focused on the personal and professional lives of several young women residing in Los Angeles, California.
The fourth season premiered on August 18, 2008, at which time it was moved back to its original Monday schedule.
The season aired a total of twenty episodes, each half spawning ten, before finishing on December 1, 2009.
In July 2012, MTV aired a month-long morning marathon of The Hills, titled "Retro Mania".
The following year, the marathon was renamed "RetroMTV Brunch", and culminated with the airing of an alternate series finale ending in August 2013.