An acquaintance about the phenology of cultivated crop is required for its proper management. Phenology reveals the timing of recurring biological events like bud break, flushing, flowering and fruiting. Therefore, a study was conducted to find out various phenological stages of wood apple under hot semi-arid condition during 2016 and 2017 at Central Horticultural Experiment Station (ICAR-CIAH), Vejalpur, Gujarat. Based on the extended BBCH-scale, three digit codes were used in this study to know the growth stages of the wood apple tree. In present study, seven principle growth stages were observed in terms of code like 0) bud, 1) leaf, 3) shoot development, 5) inflorescence emergence, 6) flowering, 7) fruit development, and 8) fruit maturity. The swellen axillary buds require 7-8 weeks for full shoot development and vegetative growth usually complete in 18-22 weeks. The peak flowering period was observed between mid March to mid April and lasts about 2-5 weeks. Wood apple fruit showed double sigmoid growth pattern and took about 20-22 weeks from fruit set to maturity. It has been observed that the days required 18-20 from bud swelling to complete anthesis for reproductive cycle. This study will be very useful to carryout various agro-cultural practices to enhance the production and productivity of wood apple under field condition based on the physiological events.