In 1983, research horticulturist David W. Ramming and technician Ronald L. Tarailo—Californian grape breeders working for the ARS, the chief scientific research agency of the USDA—crossed Thompson Seedless and Concord in order to answer a technical question about a newly developed procedure for breeding novel, superior seedless grapes. The researchers wanted to demonstrate that plants created from embryo culture were derived from fertilized eggs (zygotic) instead of the maternal tissue (somatic). From 1231 emasculations (removal of male flower parts to control pollination) of Thompson Seedless, the researchers produced 130 ovules using embryo rescue procedures. From these, 40 embryos developed and three seedlings were planted. The original seedling of Thomcord was planted in 1984 in plots in cooperation with California State University, Fresno. It was later selected in 1986 by Ramming and Tarailo and tested in the San Joaquin Valley under the name A29-67, and was introduced as "Thomcord."

The new hybrid was tested and scrutinized for 17 years before it was declared ready for growers and gardeners and was released on . Around 2008, trials outside of California were just beginning. Thomcord quickly became a hit at farmers' markets while it was being tested, and it has appeared in the fresh-fruit section at supermarkets. This continued the long-standing success of the ARS' grape-breeding research in California, which has developed some of the most popular seedless grapes on the market as well as red, white, and black grapes varieties for hobbyists and professional growers since 1923.

Although it has been called a "sentimental favorite" at farmers' markets, it is not expected to become a major commercial variety because its flavor is not as neutral as more popular grapes, such as Thompson Seedless, Crimson Seedless, or Flame Seedless. However, Ramming predicted that it would become a specialty item, much like the Muscat varieties, due to its distinctive, Concord-like flavor. Because of its strong reception at farmers' markets, it could compete with Concord and Niabell varieties in eastern markets, according to Ramming.

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