Different genotypes of white lupin were studied for 2 consecutive years and at 6 sowing periods within each year. The mechanisms of frost resistance in lupins was studied. The thickness of the root parenchyma appeared to be a major factor of root frost tolerance. Despite genetic variability existing for this character, it was mainly influenced by the sowing period. Early sowings were necessary for good root frost tolerance. The components of the tolerance of aerial parts were shown to have high vernalization needs and high cold hardening ability. There was a large genetic variability for both characters. Screening techniques could readily be developed. Because of their high vernalization needs, frost tolerant genotypes tended to produce a high number of leaves on the main stem which meant increased risk of lodging. The prospects of improvement through the use of growth regulators and the breeding of dwarf genotypes are discussed.