A field experiment was conducted during 2014-15 at the Instructional Farm attached to the College of Agriculture, Vellayani, Kerala with the objective to find out the optimum planting time for Grand Nain banana and to study the phenology of the cultivar. The experiment was laid out in RBD with ten treatments and four replications. The treatments were ten dates of planting starting from the month of January onwards up to October. Planting was done on 28 day of every month from January onwards. The study revealed that the planting dates had significant influence on growth, yield and fruit quality of Grand Nain banana. From the study it can be inferred that ideal planting time for Grand Nain banana is February in the southern agro climatic condition of Kerala which resulted in shorter duration and higher productivity.