Records which had been made on the first appearance of the meadow spittlebug over a 6-year period were examined in conjunction with locally available weather data in an effort to develop empirically a method for predicting the time of egg hatch. An accumulation of day-degrees above a daily minimum mean temperature of 40[degree]F, corrected to exclude the degrees above a daily maximum mean temperature of 50[degree]F, could be associated with the observed hatches. A total of 150 day-degrees was selected as the base for predicting the hatch within a week. Accuracy of the method is adequate for planning applications of residual insecticides prior to the egg hatch.