Customers filled the dining room of In-N-Out Burger’s new restaurant in Monrovia on opening day, Thursday, Sept. 25.

It occupies a 1.3-acre lot at 560 W. Huntington Drive, the site of a demolished Black Angus restaurant in the Huntington Oaks Center.

A pathway of cones snaked through the shopping center’s parking lot with parking attendants surrounding the building to guide motorists into the drive-thru.

In-N-Out Burger opens its 425th location in Monrovia on Sept. 25, 2025. (Carolyn Burt, SCNG)

In-N-Out Burger opens its 425th location in Monrovia on Sept. 25, 2025. (Carolyn Burt, SCNG)

In-N-Out Burger opens its 425th location in Monrovia on Sept. 25, 2025. (Carolyn Burt, SCNG)

In-N-Out Burger opens its 425th location in Monrovia on Sept. 25, 2025. (Carolyn Burt, SCNG)

The pop up sh

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