According to federal regulations, what percentage of grapes must be from the stated variety?

In the United States, federal regulations dictate that for a wine to be labeled with a specific grape variety, at least 75% of the grapes used in that wine must be from the stated variety. This requirement ensures that consumers can have a reasonable expectation regarding the primary characteristic and flavor profile of the wine they are purchasing.

This percentage reflects a balance between maintaining authenticity in labeling while allowing some flexibility for winemakers to blend in smaller amounts of other varieties, which can enhance the wine's complexity without the proposed variety losing its presence. In contrast, many regions around the world have different laws, but in the U.S., the 75% rule is uniform across the board for varietal labeling.