A field investigation was carried out in naturally ventilated polyhousewith 30 genotypes of cucumber to study the performance of thegenotypes for growth and yield characters under hill zone of Karnataka.Maximum vine length (2.21 m) and number of branches (6.81) wererecorded in the genotype Sirsi Local-2 whereas minimum vine length(1.21m) and number of branches (4.40) were recorded in Tupe andWhite Long, respectively. Data on flowering and fruit setting indicatedthat the genotype Poinsett showed first female flower at the lowernode (3.51). In contrast, genotype Tupe showed first female flowerat higher node (8.58). The genotype Sirsi Local-2 took minimumnumber of days to first harvest of the fruit (36.47 days) while thegenotype Kerala-2 took maximum days to first harvest of the fruit(57.31 days).The genotypes Sirsi Local- 1 and Banglore Local weresuperior for fruit length and fruit diameter. The genotype Poinsettproduced maximum number of total fruits per vine (13.90) and highestyield per vine (2.55 kg) and minimum number of fruits per vine (4.04and 5.30, respectively) and minimum yield per vine (0.65 and 0.55kg, respectively) were recorded in the genotypes White Long andPondicherry-1, respectively.