Growing Degree Unit Calculator

Beauty shot of cornfield

Growing Degree Unit (GDU) Calculator

(1) Enter postal code for field location. (2) Move the green slider to set plant date. Results show total GDUs and Year-To-Year Comparisons change by date. (3) Move the brown sliders to set daily, weekly, monthly, or annual accumulations. (4) Click on any graph line for number estimates. (5) Click on any graph bar for daily details.

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Pioneer Weather Information Disclaimer

This information is calculated using weather data provided by IBM and Pioneer makes no representations or warranties as to the accuracy or completeness of such data. The unique IBM Weather Forecast System provides more localized, more frequently updated, more consistent, and more accurate professional grade weather forecasts, with the added value of meteorologists being available for expert customer consultation during mission critical situations. This state of the art combination of computer technology and human experience consistently yields substantially improved results.

Please select field location
View Map Selector
Enter a start date
CRM value must be between 70 and 135

Select Location From Map

CHU Toggle

Graph Layers

Black Layer
Custom GDU Layer

Total GDUs Since

To Date




Versus Normal


Forecast (+14 Days)


Accumulated GDUs
Degree Units
Individual GDUs
Degree Units

Year-to-Year Comparisons From To

Season Total GDUs GDUs from Normal
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