50 C.F.R. § 91.11
Contest opening date and entry deadline
The contest officially opens on June 1 of each year. Entries must be postmarked no later than midnight, August 15. For the latest information on contest time and place as well as all deadlines, please visit our website at http://www.fws.gov/birds/get-involved/duck-stamp.php or call (703) 358-2145.