WINNER SELECTION AND NOTIFICATION: On or about June 9th, 2014, for each Geographic Area one (1) potential winner (“Winner”) will be selected in a random drawing by representatives of Sponsors from all eligible Entries received from that particular Geographic Area during the Sweepstakes Period. There will be a total of twenty-two (22) potential Winners. Sponsors will make two (2) attempts to notify potential Winners at the phone number and/or email address submitted at the time of entry.
Also, if they don't announce the winners publicly you can get a list:
WINNER ANNOUNCEMENT: For the name of the Winners, available after June 7th 2014, send a self-addressed, stamped envelope to be received by August 7th, 2014 to: Tonight Show Summer Vacation, c/o The Regan Group PO Box 1006 12700 Inglewood Ave, Hawthorne CA 90250.