Blueberry Heat Model

To retrieve current heat units from the blueberry heat model, choose a state and corresponding weather station, then select a start year, start month, and start day.

Note that the start date represents the date at which 25% corolla drop was observed.

Select a state:

Select a station:

Select a start date:


This project is being done in collaboration with Bill Cline and Benny Bloodworth in the NCSU Department of Plant Pathology, and the North Carolina Agricultural Research Service (NCARS).

* Model accumulates 1 heat unit when temperature is above 65° F, 0.5 units between 55° and 65° F, 0 units between 45° and 55° F, and -0.5 units below 45° F. The heat model begins when there is 25% corolla drop observed, and ends when 25% of fruit on the same bushes is ripe.
Model developed by Dr. Mike Mainland, Professor Emeritus, NCSU Department of Horticultural Science.

** Forecast is made from numerical weather model WRF, initialized at Z