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Growing Degree Days Calculator
Compute daily growing degree days for crops.
Growing degree days
—
For the day.
| Average temp | — |
|---|---|
| High | — |
| Low | — |
| Base | — |
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Enter your figures above to see the step-by-step working.
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How the Growing Degree Days Calculator Works
Growing degree days (GDD) measure accumulated heat to predict how crops and pests develop. For one day, average the high and low temperature and subtract a base temperature below which the plant doesn’t grow (often 50°F). A day with a high of 80 and low of 60 gives an average of 70, so 20 GDD above a 50°F base. Negative results count as zero.
Farmers and gardeners add GDD across the season to time planting, spraying and harvest — a crop might need a set number of accumulated GDD to reach maturity.
GDD = (high + low) ÷ 2 − base temperature (min 0)
Frequently Asked Questions
What are growing degree days?
A heat-accumulation measure used to predict plant and insect development. One day’s GDD is the average temperature minus a base value.
What base temperature should I use?
50°F is common for many crops; corn uses 50°F, some cool-season plants use 40°F. Match it to your crop.
How are GDD used?
They’re added up over the season to time planting, pest control and harvest.
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