The method using the wavelet transform (Coiflet order = 4) showed the best result. The RMSEs of the growing period and each phenological stage were around 12 days. We believe that the good accuracy of our method is sufficient for discrimination of rice phenology in regions where dates are not available. However, for use in crop yield models, we consider that the RMSE of the estimated planting date (12.1 days) was inadequate and has to be improved.