when do the Colosseum tickets come out?

Tickets for the Colosseum can be purchased online at the official Colosseum website or through other authorised retailers. Usually, tickets are available for purchase several months in advance. I recommend that you check the official website regularly or subscribe to any newsletters to receive updates on availability and any new date openings. If you have a specific date in mind, it is best to buy tickets as early as possible, as they tend to sell out quickly, especially during the peak tourist season.