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	3942	4081
Ridgetown	3549	3854
London	3586	3768
Sarnia	3598	3891

Updated October 26, 2025 We will stop accumulation on the first occurrence of -2 C We have now concluded accumulation of CHU for 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	974	983
Ridgetown	824	941
London	900	915
Sarnia	917	989

Updated November 4, 2025