Phenological data of the grape 'Niagara Rosada' obtained at Jundiaí, São Paulo State, Brazil, from 1986 to 1993, was used to evaluate three agrometeorological methods to predict the probable harvesting date: a) flowering date plus 85 days; b) date of accumulation of 1,000 degree-days (base temperature = 10°C) from pruning date plus 42 days; c) date of accumulation of 1,200 degree-days from pruning date plus 26 days. The methods that utilized degree-days showed the best estimates with errors of 4 days in relation to observed harvesting dates, then, it is recommended the use of the b method by allowing forecasts 42 days in advance.
grape; 'Niagara Rosada'; harvesting date; agrometeorological methods