Heat Units Available for Corn Production in Ontario
![](https://corn.gocrops.ca/wp-content/uploads/sites/2/2024/02/Screenshot-2024-02-26-at-10.39.09 AM-1024x683.png)
Notes:
Corn Heat Unit ratings for all areas of the province are based on the average heat unit accumulation for the period from May 1 to
the date in the fall when the longterm average daily temperature falls below 12°C or an occurrence of-2°C, whichever comes first.