Grain crop plants respond to environmental signals that regulate timing in stages of development.

Heat units in agriculture are often expressed as growth degree days
or GDD.

Calculating GDD uses a simple formula that involves subtracting a base temperature from the average temperature for the day. More...

corn field
DIRECTIONS

Corn maturity and stages of development can be estimated using current and historical weather data.Your seed company should provide you with the number of GDD (or GDU's) to silking and/or maturity. Use Calculator 1 and enter your location, planting date, and GDD to silk and/or GDD to black layer to find the corn maturity date.

If you are unable to obtain GDD information, we can estimate by the corn relative maturity number. Use Calculator 2 and enter your county, planting date and relative maturity number to find the corn maturity date.

Disclaimer: This calculator is made available for independent use with results based on information provided by the user. Calculated results are believed to be accurate but results are not guaranteed. Results can not and do not guarantee applicability or accuracy in regards to individual circumstances.

This site best viewed

Using Firefox / Internet Explorer 8 / Google Chrome

 

Calculator 1 - Use this form if you DO know your Silking
& Maturity GDD

Your seed company should provide you with the number of GDD (or GDU's) to silking and/or maturity. Place this information into the calculator below to estimate your corn maturity.


Select County:
Planting Date: (mm/dd/yy)
GDD to Silk:
GDD to Black Layer:

Calculator 2 - Use this form if you DO NOT know your Silking
& Maturity GDD

If you are unable to obtain GDD information, we can estimate by the corn relative maturity number. Place this information into the calculator below to estimate your corn maturity.


Select County:
Planting Date: (mm/dd/yy)
Relative Maturity: