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Country bean is a winter crop valued for seeds and young twigs for vegetable purpose, and now it also cultivated in summer season for the introduction of photo-insensitive genotypes. Seeds of country bean are high source of protein and the amount of protein is highest at physiological maturity stage. For this, the experiment was conducted to identify the physiological mature stage of seed in the summer season as this stage is indicated by the maximum deposition of dry matter and the proper time of harvest to gain maximum benefit. Four genotypes of country bean (Sikribi Sheem-1, Sikribi Sheem-2, IPSA-2 and SB-003) were investigated in the summer season. The field experiment was done in RCBD with three replications. Randomly 10 pods/replication were harvested at three days intervals from 12 DAF up to 30 DAF and data were collected. Statistical analysis have been done with the help of R software. It was found that SB-003 produced the highest fresh weight (67.57 g). Sikribi Sheem-1 was also good at pod production (65 g). Though Sikribi Sheem-1 and SB-003 showed better performance over Sikribi Sheem-2 and IPSA-2, all the genotypes showed better performance in pod production at 21 DAF. Highest seed weight (10.3 0.13) found at 27 DAF and seed dry weight increased gradually and maximum at 27 DAF. Seed dry weight of 10 seeds varied from 6.92 to 8.02 for different genotypes. Dry matter content of the seed was highest (34.46%) at 27 DAF after that it started to decrease. Cotyledon DM (38.32%) and shell DM (29.77%) were also highest at 27 DAF. Other seed growth parameters increased up to 27 DAF and for all the genotypes after that, it started to decrease. It is concluded that 27 DAF is considered as physiological maturity stage for country bean seed production in summer season in acid soil and 21 DAF is considered as the proper time of harvest for vegetative purpose.