A new and distinct cultivar of blueberry plant named ‘BB05-185GA’ as described and shown herein. ‘BB05-185GA’ is a new and distinct low chill tetraploid Southern highbush blueberry (Vaccinium) variety of complex ancestry, based largely on V. corymbosum and with over 13% V. darrowii and small contributions of V. angustifolium, V. tenellum, and V. ashei. It is a productive mid-late season variety that ripens between Star, a widely planted mid-season highbush variety, and Climax, an early season rabbiteye variety. It is characterized as having a very large fruit with a very small and dry picking scar, light blue color, very firm with outstanding fruit quality and flavor for fresh market. In part ‘BB05-185GA’ provides outstanding fruit quality and flavor, its harvest season fills a void between highbush and rabbiteye seasons and it has good machine harvest potential.