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There are many different varieties of onions that you can grow in your garden.
Green bunching--Crystal Wax, Eclipse, Evergreen Bunching, White Portugal, Beltsville Bunching (42 - 55 days to maturity)
Dry onions--Crystal Wax, Grannex 33, Grano 502, Sweet Vidalia, (bulb-type), Sweet Georgia '(100 - 120 days to maturity)
Both can be planted January 1 - March 15 (Spring), Green Bunching - September 1 to December 31 (Fall), Bulb-types - October 10 - November 10.