There is a small isolated pocket at the southern end of Lake Manitoba. Hackberry's range overlaps with the sugarberry (Celtis laevigata), making it difficult to establish the exact range of either species in the South.
There is a restricted area at the southern end of Lake Manitoba where hackberry and sugarberry (Celtis laevigata) coexist. This overlap complicates efforts to accurately define the range for each species within the South.