Cucamonga Valley received its designation as an AVA in 1985. Situated on 136,581 acres, Cucamonga Valley is centered around the city of Rancho Cucamonga. A pre-Prohibition leader in wine production, Rancho Cucamonga has seen its wine production limited by the eastern expansion of Los Angeles. The soils on the valley floor are sandy and alluvial in nature. The climate in Cucamonga Valley is hot with daytime temperatures reaching over 100 degrees in the height of the growing season. The high desert climate cools considerably at night, preventing the vines from ripening the fruit too quickly. The region is known for its old vine Zinfandel production.
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