Growing Degree Days for Winter Wheat Development

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Crop Heat Units (CHUs) Corn 2025

Location	Crop Heat Units as of May 1st 2025	CHU accumulation last year
Harrow	3713	3901
Ridgetown	3348	3691
London	3406	3618
Sarnia	3393	3710

Updated October 9, 2025

Growing Degree Days Winter Wheat Development September 2025 and forward

Location	Growing Degree Day accumulation as of September 1st 2025	GDD accumulation last year
Harrow	697	700
Ridgetown	575	673
London	663	663
Sarnia	657	788

Updated October 10, 2025