"Collide" was released in the United States on June 1, 2004, as the third and final single from Day's second full-length album, Stop All the World Now (2003).

The track became the biggest success of Day's career, reaching number 20 on the Billboard Hot 100 a year after its release in June 2005.

"[4] The Beaver County Times put the song in their "All You Need is Love" list writing, "Perfect for the newbie phase of a relationship.

Sure, you're still scared, but as Day sings "Out of the doubt that fills my mind I somehow found you and I collide," it cajoles you to just give in to the lovin' in front of you.

"[6] The popularity of "Collide" built slowly on US radio, at first gaining the greatest success on Billboard's Adult Top 40 chart.

[43] Daniel Evans, a finalist on The X Factor (UK), produced a country/pop cover on his YouTube channel in 2013 and was subsequently released on iTunes as track 3 of his self-produced Reflections EP.

In 2015, Sarah Charley, US communications manager for the Large Hadron Collider experiments at CERN with graduate students Jesse Heilman of the University of California, Riverside, and Tom Perry and Laser Seymour Kaplan of the University of Wisconsin, Madison created a parody video sung from the perspective of a proton in the Large Hadron Collider.

This song has also been featured during episodes of Laguna Beach: The Real Orange County, Ghost Whisperer, Scrubs, ER, Bones, Third Watch, Cold Case, One Tree Hill, Grey's Anatomy, Summerland and Joan of Arcadia.