Firehouse Subs Rewards Members can score a free medium sub when you buy a medium sub and use the code EXTRA at checkout on the Firehouse Subs App or on their website through Wednesday, Sept. 16 at participating locations.
They are offering the deal every Monday through Wednesday when there is a big baseball game that goes into extra innings during the weekend before. See the details on their app or on their website HERE. You can also see the offer on the e-mail sent to reward members on Sept. 15, 2026.