FREE Monster Doughnut on Halloween at Krispy Kreme Posted On October 15, 2019 Get a FREE Monster Doughnut on Halloween at Krispy Kreme These scary delicious doughnuts are here to satisfy your need for tricks and treats. You’ll catch them in participating shops through Halloween, sneaking around and creating mischief. This collection of monsters is perfect for any party. Get in the spirit with Slimon, Mumford, and Hypno-Henry, then stop by on October 31st wearing your Halloween costume for a FREE doughnut of choice.Halloween doughnuts not available in CT or HI Krispy Kreme shops. Costume offer not valid in CT, IA, or NE Krispy Kreme shops.***