A study was done to evaluate the stability of twenty-five genotypes of grain amaranth for thirteen quantitative characteristics along with grain yield plant^-1(g). Genotype × environment relationships demonstrate significant differences in leaf area plant^-1 (cm²), number of branches plant^-1, stem diameter, grain yield plant^-1 (g) and protein content (%) when examined against pooled error. The assessment of the environmental index (I_j) showed that E1 (day of seeding: 11^th November, 2019) was the most enthusiastic environment for the grain amaranth. Genotypes SKGPA-150, SKNA-401 and SKNA-808 expressed average stability for grain yield plant^-1 (g) in addition to stem diameter (mm), leaf area plant^-1 (cm²) and protein content (%), whereas SKGPA-61 showed average stability for grain yield plant^-1 (g) along with stem diameter (mm) and protein content (%). SKNA-903 showed stability for leaf area plant^-1 (cm²), protein content (%) and grain yield plant^-1(g). Whereas, BGA-7-1 revealed stability for stem diameter (mm) and leaf area plant^-1 (cm²) with grain yield plant^-1 (g).