Festivalen ble arrangert fra 27 Jun til 08 Jul 2012 (11 dag(er)).
Summerfest finner sted i Milwaukee, United States. Her er den fullstendige adressen til festivalen: Henry Maier Festival Park; Milwaukee, Wisconsin, United States
Imagine Dragons, Iron Maiden, Scorpions, Big Time Rush, twenty one pilots, Zac Brown Band, Foo Fighters, Skillet, Alice Cooper, Tiësto, Aerosmith, ZZ Top, Brantley Gilbert, Death Cab for Cutie, Hollywood Undead.
De mest populære sjangrene og undersjangrene i den siste utgaven var:
rock
pop
hip hop
alternative rock
alternative
indie
indie rock
hard rock
indie pop
pop rock
classic rock
rnb
metal
southern rock
acoustic
dance
post-grunge
blues rock
electronica