Applying nitrogen fertilizers in agriculture can cause uncontrolled gas emissions such as N2O and CO2, leading to global warming and serious climate changes. In this study, we evaluated the greenhouse gas emissions (GHGs) that are concomitant with applying different rates of N ferti-lization, i.e., 50, 75, 100, and 125% of the recommended dose for two cultivars (Balady and Sids-40) of Allium sativum L. grown under three planting dates (15 September, 1 October, and 15 October). For this purpose, two field experiments were carried out during the two growing seasons of 2020/2021 and 2021/2022. Treatments were arranged in a split–split plot design with three replicates; planting dates were set up in the main plots; nitrogen levels were conducted in the submain plots, and garlic varieties were in the sub-subplots. The obtained results can be summa-rized as follows: Planting on 15 September significantly increased vegetative growth parameters (i.e., plant height, number of leaves plant−1, plant fresh and dry weights) and total bulb yield, in both seasons. Application of the highest rate of N (125%) gave significantly higher records for vegetative growth parameters, while the 75% nitrogen treatment appeared to give the highest total bulb yield in both seasons. Means of plant growth characteristics and total bulb yield were significantly increased by the cultivation of the Balady cultivar. In addition, results show that GHGs were positively correlated with increasing the rate of N fertilization. It could be recom-mended that planting on 15 September and fertilizing with 75% N fertilizer from the recom-mended dose for Balady cultivar achieve maximum yield and its components.