Based on when onions are harvested, U.S. grown onions can be divided into two categories:
Spring/Summer Onion Traits
- Available in yellow, red, and white from March through August
- Can be identified by their thin, lighter-colored skin
- Range in flavor from sweet to mild
Fall/Winter Onion Traits
- Available August through May in yellow, red, and white
- Easy to recognize by their multiple layers of thick, darker colored skin
- Range in flavor from mild to pungent
(Source: The National Onion Association)