Single Smash for $1 on National Cheeseburger Day

Smashburger is offering a single Smash® burger for just $1 to SmashRewards members on September 18, 2026. This deal is valid for one burger with beef, black bean, or chicken Smash® protein at participating US locations. The offer is exclusive to rewards members and can be redeemed in-restaurant or online with same-day pickup. A maximum of one burger per account and per transaction is allowed. Terms and conditions apply. This is a significant discount on a burger, especially for a promotional day, making it a deal worth considering if you're a rewards member or planning to visit on that day.