Story:
A family heirloom from Polk County, Minnesota, its seed was sent to Dorothy Beiswenger of Crookston, Minnesota in the early 80s as a 'No Name' variety. Dorothy liked it so much that she decided to name it "Big Rainbow" and then offered it in the SSE 1983 Yearbook under that name.
First offered commercially in 1990 by Southern Exposure Seed Exchange . This has become a popular heirloom tomato.