Growing Degree Days (GDD)
Crop Categories - Top 5 documented crop categories
Pests & Diseases - Top 5 commonly documented pests & diseases


GDD is a measure of heat accumulation used to predict plant and animal development rates. It’s calculated by comparing the average daily temperature to a reference temperature.
FarmNerd uses data from the world’s most trusted meteorological institutions and displays GDD by geographical region for both this season and last season.
By tracking GDD, farm managers and agronomists can better estimate the timing of key activities in the field. For example:
When is the ideal time to plant?
When is the highest risk for pests and diseases?
When will the crop be ready for harvest?
You can read more about using GDD in during the 2023 season start in Europe.


By tracking GDD, farm managers and agronomists can better estimate the timing of key activities in the field. For example:
When is the ideal time to plant?
When is the highest risk for pests and diseases?
When will the crop be ready for harvest?
You can read more about using GDD in during the 2023 season start in Europe.

If you are using the Farmable app to document your activities in the field, GDD is automatically tracked for you. Farmable manages your weather data:
Access Delta T from the Farmable App to inform spray conditions.
Automatically document weather conditions when spraying and fertilizing.
Connect your farm's weather station for precision weather data in the context of your field operations.
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