The present investigation was carried out at Vegetable Experimental Farm, Division of Vegetable Science & Floriculture, SKUAST, Chatha during spring - summer 2012-13 and 2013-14, to assess the magnitude of genotype × environment interaction and stability performance. Twenty five tomato genotypes were evaluated for yield and its components under six environments for two years during spring summer season of 2013 and 2014. For a given trait, a desirable, widely adapted and stable genotype is defined as one with an individual mean performance greater than the average mean, regression coefficient (bi=1), and deviation from mean squares (S2di=0). Highly significant mean squares for genotypes, environments and genotype × environment interaction were recorded for fruit length, total number of fruits per plant, total yield per plot and plant height. The genotype Karan was identified stable for days to 50% flowering;Lehar and Solan Lalima were most stable for days to first marketable fruit picking; Heem Sohna and Leh Local for total yield per plot and NS-2535 for marketable yield per plot.