This application is designed for winter wheat and winter canola producers outside of Oklahoma to use to calculate the number of growing days since the crop was planted (GDD>0). This calculation can be used for Sensor Based Nitrogen Management strategies that utilize the GreenSeeker Sensor and N-Rich Strip. Also included in this application is a cumulative Growing Degree Day (GDD) calculator. Crops included in this calculator are: Wheat, Grass hay, Alfalfa, Corn, Cotton, Peanut, Sorghum, and Soybean. The application uses user zip code to identify where temperature data is collected from.