Four experiments were carried out to verify the influence of seed samples from two cultivars, Brasília and Tim Tom; of the hidro and thermal stress, and of the osmotic conditioning, on the performance of carrot seeds under the germination test. In the first experiment, six seed samples were evaluated. In the second, levels of -0.05; -0.15 and -0.25MPa were used to induce hidro stress on the seeds. In the third the solution of -1.0MPa, under temperature of 15°C during seven days were used for osmoconditioning. In the fourth, the temperature of 40°C during 12, 24 and 36 hours were used for thermal stress. In the last three experiments, only the seed samples named as 1A, from the cultivar Brasília, and 5B, from the cultivar Tim Tom were used. The sample taken from the cultivar Tim Tom had the best performance. The maximum of seed germination achieved was 75.90%. The maximum percentage of seed germination was decreased under conditions of hidro stress but the time to reach 63.21% of this maximum was increased. The osmotic conditioning improved the performance of the carrot seeds from the cultivar Tim Tom. The use of thermal stress during 12 hours had influence on the performance of seeds if compared to those used in the control. The combination model/data set had parameters far from linear after the use of the stressful treatments.