In this study, it was aimed to examine the changes in vegetative growth of some curly and Cos type lettuce varieties in the unheated greenhouse in the autumn period, according to the measurement and analysis results at certain intervals from planting. A total of eight lettuce varieties, 4 of which are curly and 4 are Cos, were used in the study. Plant height, root collar diameter, leaf number, and fresh and dry weight of leaves and roots were determined in quantitative growth analyses performed at intervals of 10 days from planting. In addition, total plant dry weight, leaf weight ratio (LWR) and root weight ratio (RWR) values were also examined. As a result of the research; It has been determined that lettuce varieties show significant differences in terms of vegetative growth characteristics. At the end of the 60ᵗʰ day, it was determined that the plant height of lettuce varieties varied between 15.18-30.2 cm and the diameter of the root collar between 11.44-17.78 mm. While there was no statistically significant difference in the number of leaves in curly lettuce varieties, it was found that there was a significant difference (p<0.05) between the varieties in Cos lettuce type. In the present study, leaf weight ratio varied between 0.69-0.81 and root weight ratio values were found to be between 0.19-0.31 in Cos type lettuce.