Onions: Bulb, Green and Leeks - 2010 Ohio Vegetable Production Guide
The bulb onions grown in Ohio are the long day storage varieties. The market prefers the golden color with a single center that will store all winter.
All bulb-type onions are direct seeded beginning in early April with the last seedings in mid-May. Harvesting begins in early August and continues through October. Curing is started in the field and finished while in storage. Generally, Ohio weather conditions are not favorable for field curing.