Leaves are very large and dark green. Young leaves often have merged leaflets. Flowers are sparse and borne on very short peduncles. Buds are green, corollas medium-sized and white, anthers large and orange. Tubers are oblong to long and flattened.
Skin is heavily and uniformly russeted.
Eyes are shallow, few and unevenly distributed. Dormancy is exceptionally long. Nooksack is resistant to most external and internal defects including second growth, growth cracks, stress malformations, hollow heart, sugar ends, blackspot bruise, heat necrosis and net necrosis caused by leafroll virus. It is resistant to Verticillium wilt, Rhizoctonia and common scab. Nooksack is an exceptional storage variety due to its long dormancy and low sugar content.