If you’re referring to In-N-Out Burger, even the expansion to Vegas/Phoenix only occured about 15 years ago. The original readon for their lack of expansion was supposedly that they would only expand into a new area when a family member was willing to move there to run the new location. Back then, there weren’t even many locations in Northern California. It was mostly a Southern California chain. When the parents passed the business down to the next generation, they said, “Screw that! Let’s cash in!” That’s when expansion eastward began with Vegas/Phoenix.
I’m assuming that’s not a fast food burger. If you’re opening it up to more traditional sit down, but still casual restaurants, Hoppdoddy Burger Bar is a chain (It started in Texas, but it’s AZ, CA, CO and apparently Nashville and Memphis too) that makes fantastic burgers and a great selection of high quality micro brews on tap. It’s not cheap (and prices have increased due to Biden’s record inflation too), but the quality is really good. I think their micro brews skew toward local selections (at least it does in AZ).
