Sumo oranges, also known as Sumo Citrus, are primarily grown in two main regions:

• The San Joaquin Valley in California, USA, where most of the orchards are concentrated within about a 60-mile area including cities like Porterville, Lindsay, Strathmore, and Exeter

• The southern part of Australia, specifically in the Riverland, Sunraysia, and Riverina regions

Originally developed in Japan, Sumo Citrus was introduced to the U.S. in 1998 and commercialized in California starting in 2011. It is a challenging variety to grow, requiring careful cultivation and quality control

. Thus, if you are looking to find where Sumo oranges are grown, the key growing areas are California's San Joaquin Valley and select southern Australian regions