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For proper orchard management, the phenological study of fruit trees is crucial. To study the phenological growth stages of different apple cultivars, a study was carried out at Temperate Horticulture Development Centre, Marpha, Mustang. The study was conducted from January to August 2023. The study was conducted for 6 cultivars of an apple available at Temperate Horticulture Development Center (Saune, Tsukura, Red Delicious, Golden Delicious, Royal Delicious and Rich a Red Delicious) where trees of each cultivar are replicated 4 times in Randomized Complete Block Design. The phenological stages of different cultivars were studied from the reference date which consists of 9 different stages (dormant, silver tip, green tip, half-inch green, tight cluster, pink, bloom, petal fall and fruit set. Climatic variables (temperature, relative humidity and rainfall) were estimated from the automatic weather station present in the development center. Data analysis was done through R Studio. The study of flowering phenology revealed that Tsukura (94.00 DARD) was the earliest and Golden Delicious (114.25 DARD) was the most late to reach a fruit set stage. The average blooming period of the typical flower of different apple cultivars was 10 days. The fruit set took place approximately a week after the completion of the full bloom period.