Abstract: A cold-resistant Persian walnut cultivar originating as an open pollinated seedling from a population of seedlings, for which the identity of the female parent was not recorded, that were planted at the Iowa State University Horticulture Research Farm, Ames, Iowa, USA in 1971, and evaluated as ISU71-EI8. Past literature and growth characteristics suggest that one of the parents was probably ‘Hansen’ (unpatented) Persian walnut. The other parent may have been ‘Colby’ (unpatented) Persian walnut. Tree has consistently exhibited minimal shoot die-back when exposed to late-fall/early-winter, mid-winter, and late-winter freezes; when exposed to minus 35.6 degrees Celsius, trees suffered only minor to moderate shoot die-back while other cultivars and selections were killed or severely injured. Catkin survival has been recorded following expose to minus 32 degrees Celsius.