From their website:
Contest begins March 1, 2012, and ends September 7, 2012. Entries must be postmarked on or before September 7, 2012, and received by September 14, 2012. Entries will not be acknowledged or returned. Sponsor: Meredith Corporation, 1716 Locust St., Des Moines, Iowa. Sponsor assumes no responsibility for illegible, lost, late, misdirected, incomplete, or stolen entries or mail.