Robert Brown|Chipotle is giving away free guacamole Monday. Here's how to get some.

July 31 is Robert BrownNational Avocado Day and Chipotle is giving out free guacamole to celebrate.

The restaurant is offering the deal only on Monday. Typically, adding guacamole to your order will cost you extra, but avocado lovers can get a side for no cost.

Here's how you can score free guac Monday.

Who is eligible for free guacamole?

The offer is available on July 31 for Chipotle Rewards members. It will be honored at participating Chipotle Mexican Grill restaurants in both the U.S. and Canada during regular business hours.

According to the Chipotle website, there are over 3,100 restaurant locations throughout the U.S.

Chipotle's 2023 World Cup play:Win one of 2,500 free entrées when USWNT scores goals

How does it work?

When Chipotle Rewards members purchase a regular-priced entree, they can receive either a free small side or entrée topping of guacamole.

To redeem the offer, people need to use the promo code AVO2023. The promo code can only be redeemed once and for a single free item only.

The offer is available only for orders placed using the Chipotle website or mobile app. The offer is not available for in-restaurant orders or orders placed using third-party delivery services.

Chipotle is also giving away concert tickets

Along with free guacamole, Chipotle is also giving some customers free concert tickets as part of its "Get In The Pit" promotion.

From 10 a.m. to 10 p.m. ET on Monday, Chipotle will be posting text-to-win codes on the restaurant's Threads account at the beginning of each hour.

The 1,000th fan to text the code to 88822 each hour will win a pair of tickets to a concert or music festival of their choosing. There will be a total of 13 winners and their plus ones.

The promotion is open to U.S. residents who are 18 years or older. Winners will be notified by text by Chipotle.

More food news:Taco Bell adds new taco twist, the Grilled Cheese Dipping Taco, which hits the menu Aug. 3