Diary Queen Free Cone Day March 20th 2019 The links in the post below may be affiliate links. Read the Full DisclosureMarch 13, 2019 by Kim Julian Leave a Comment March 20th head to a a participating Dairy Queen and get a free small soft serve cone in honor of FREE Cone Day! No coupon needed. Participating locations only, so call ahead. For more bargains check out the Restaurant Deals Page! Follow along with all of the Coupons, Freebies and Deals by Subscribing to STL Mommy’s once daily e-mail or following along on Facebook!