The beloved fast food chain opened its doors on Oct. 22, 1948 in Baldwin Park.
MORE: In-N-Out on the East Coast? Not in my lifetime, chain's president says
In-N-Out in the East Coast? Not in my lifetime, president says
In-N-Out is celebrating the day releasing its 2019 T-shirt in restaurants - along with an official party Nov. 17 at the Fairplex in Pomona.
The restaurant now has 334 locations in six states.