The research was conducted at growth chamber and greenhouse of Institute of Soil Science and Plant Cultivation – National Research Institute in Puławy. Plants were grown at Mitscherlich pots which contained a mixture of soil and sand in amounts of 5 and 2 kg, respectively. The first row factor were differentiated genotypes of yellow lupine: thermoneutral – Legat and Polo, and non-thermoneutral – Parys and Markiz, while the second row factor were two levels of thermal conditions applied in the period from sowing to seedling stage: optimal for vernalization (night: 2oC, day: 12oC) and higher which do not cause vernalization (night 14oC, day 24oC). After that period pots with plants were transferred to greenhouse where they stayed up to full maturity of lupine. The aim of undertaken studies was the evaluation of dynamics of growth, development and yielding of thermoneutral and non-thermoneutral varieties of yellow lupine in dependence on air temperature which occurs at beginning stage of their ontogenesis. Seedlings which were growing at chilling conditions were considerably lower and produced smaller mass of top but greater mass of roots. Lupine plants grown from seedlings which were kept at higher tempera-ture conditions were characterized with greater dynamics of aboveground mass increase after transloca-tion to greenhouse than plants grown from seedlings kept at low temperature conditions. Plants of ther-moneutral lupine varieties grown from seedlings which were kept at low temperature were characterized with less luxuriant growth and produced lower mass of vegetative but greater mass of generative organs than plants of non-thermoneutral varieties. Plants of all lupine varieties gave greater seed yield and produced greater yield of hulls if seedlings from which they grew stayed for some period in low temperature. The differences in generative organs yield of thermoneutral lupine varieties caused by lack of vernalization were decidedly lower than in the case of non-thermoneutral varieties. Yield decrease of lupine seeds in effect of lack of seedlings vernalization was caused by decrease of the number of pods per plant and number of seeds per pod as well as thousand seeds mass reduction.