Get a FREE Small Blizzard Treat at Dairy Queen when you download their mobile app. Create an account and then check the ‘coupons’ section for the coupon. Click here to learn more or to download mobile app. No purchase is required. You only have 15 minutes to use the coupon once you’ve clicked ‘redeem’, so wait until you are there to click that button!. Valid at participating U.S. locations only. Fulfillment by: Restaurant. Expires: Ongoing