With a well-received preview first screened on September 1, 2007 at the Telluride Film Festival, Juno premiered on September 8 at the 2007 Toronto International Film Festival and received a standing ovation, which prompted film critic Roger Ebert to say "I don't know when I've heard a standing ovation so long, loud and warm."
Uz dobro ocijenjenu pretpremijeru od 1. rujna 2007. na Telluride Film Festivalu, Juno je premijerno prikazan 8. rujna 2007. na Međunarodnom Film Festivalu u Torontu, a popraćen je burnim ovacijama, što je nagnalo kritičara Rogera Eberta da kaže "Ne znam kad sam čuo ovako duge, glasne i tople ovacije."