Marsh Grapefruit is a vigorous, large-growing variety.

This variety originated as a nucellar seedling of Marsh, developed by H. B. Frost at the University of California Citrus Research Center in Riverside from seeds planted in 1916, and it was commercially introduced in 1952.

The fruit is medium-sized, oblate to spherical, with few or no seeds. At maturity, the peel is pale to light yellow, moderately thin, firm, very smooth, and even. The flesh is light beige, tender, very juicy, and has a pleasant flavor, though less intense than some seedy varieties. Marsh grapefruit is notable for its exceptional holding ability on the tree, as well as its excellent storage and shipping qualities.

The tree is vigorous, spreading, large, and highly productive. Due to its high heat requirements, Marsh grapefruit is commercially limited to very warm climates.