Live until September 18, 2026
Join or sign in to SmashRewards, activate the National Cheeseburger Day reward in your account, and redeem it in the Smashburger app, online, or at an in-restaurant kiosk on September 18.
Valid: 2026-09-18
Region: United States; participating Smashburger Rewards locations
Eligibility: SmashRewards members only; one single Smash burger per account per transaction; valid for same-day pickup in restaurant or online; premium modifiers excluded; participating locations
