Growing Degree Days Calculator
Reviewed by Hamza Gujjar, Algorithm Architect & Software Developer
Last updated: July 28, 2026Growing Degree Days Calculator
Tracking crop development progress? This calculator computes daily Growing Degree Days, the standard agricultural heat-accumulation metric.
Average Temp = (Daily High + Daily Low) / 2
GDD = max(Average Temp - Base Temperature, 0)
Example
80┬░F high, 60┬░F low, 50┬░F base temperature (corn):
Average Temp = 70.0┬░F → 20.0 growing degree days
Why Base Temperature Varies by Crop
Different crops use different base temperatures - commonly 50┬░F for corn - below which growth essentially stops regardless of how low the temperature drops further; this base temperature reflects each crop's specific biological growth threshold.
Why Accumulated GDD Totals Matter
Summing daily GDD across a growing season is commonly used to predict crop development stages, flowering timing, and harvest readiness far more accurately than calendar days alone, since crop development tracks accumulated heat rather than simple elapsed time.