Fall frost is a serious concern to seed corn (Zea mays L.) producers in the Midwest. A frost event that happens prior to seed maturity can cause physical, biochemical, and physiological changes in the seed. These changes lead to decreased vigor and viability resulting in revenue loss for seed corn producers. Genetics and seed maturity greatly influence seed tolerance to frost damage. The central hypothesis of this study is that differences in frost tolerance can occur among the same genotype and these differences may be the result of varying seed oil and protein contents. Information gathered from this study may lead to better field management techniques for seed corn producers faced with early fall frost. This project advances our understanding of the mechanisms of frost damage and seed tolerance to frost damage. Chapter 2 discusses seed vigor of five corn hybrids with different levels of seed oil and protein following an early fall frost. Chapter 3 explores freezing characteristics of these same five hybrids during a fall frost.