There is an official Tony website, which has a link to the rules for 2014-2015. In the FAQ page, it says: WHAT SHOWS ARE ELIGIBLE FOR TONY AWARDS? Legitimate theatrical productions may be eligible for Tony Awards if they officially open on or before the cut-off date established by the Tony Awards Administration Committee (in 2015, that date is April 23) in an eligible Broadway theatre and comply with all the rules and regulations that govern the Tony Awards for the season. A show is only eligible in the season when it first opens, no matter how long it subsequently runs on Broadway. Rules, etc.