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	3593	3780
Ridgetown	3232	3583
London	3301	3523
Sarnia	3279	3593

Updated October 2, 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	570	584
Ridgetown	448 ? checking ECCC	566
London	544	563
Sarnia	525	581

Updated October 2, 2025