A new and distinct cultivar of blueberry plant named BB05-274MI-139 as described and shown herein. BB05-274MI-139 is a new and distinct high chill tetraploid Northern highbush blueberry (Vaccinium) variety of ancestry based largely on V. corymbosum with a limited number of genes from V. angustifolium. It is a productive late season ripening variety that ripens approximately at the same time as Elliott, and 25 days after Bluecrop. BB05-274MI-139 provides a very good yield potential, very good plant vigor, fruit quality and firmness, as well as characteristics suitable to mechanical harvesting, and very good flavor and texture.
