According to the website Delish, Free Coffee Mondays are back at Dunkin' locations every Monday for the entire month of February. That means that customers can claim a FREE medium hot coffee with any purchase! In order to claim your free coffee, all you have to do is become a DD Perks rewards member. The DD Perks rewards program is super simple to sign up for. Registration is free, and all you have to do is put in an email address and some other basic personal information. You can register on their website HERE or by downloading the Dunkin' app. Free Coffee Mondays officially kicked off today and will continue through February 22nd.The article reads: