Every Friday til March 15, 2024, Shake Shack is offering FREE Crinkle Cuts Fries with any order of $10+ for a limited time. To get the discount, adding Crinkle Cuts to your order in your mobile app or online and use the coupon code: FRYDAY at checkout. One time use per order. Max savings of up to $4.09.

From 2pm and 5pm local time, Shake Shack is also offering buy 1 shake and get a second shake FREE (up to $6.79) for a limited time. To get this deal, order one their website or through their mobile app and use the coupon code: TWOFORFUN at checkout. Terms and conditions can be found here. Deal expires on March 27, 2024. I dont think there is a way to stack these deals.