(NYTimes) - It is harvest season in wine country, the time of year when the scent of crushed grapes infuses the air and flatbed trucks heavy with fruit cargo come lurching down narrow back roads.

 For the winemaker Everardo Robledo — who grew up working in the fields alongside his father, Reynaldo, on weekends and after school — the harvest has a particular emotional resonance: a measure of how far the family has come since his Mexican immigrant grandfather drifted from one migrant labor camp to another and his father toiled in the vineyards for $1.10 an hour.

Mr. Robledo, 30, and his family are part of a tiny but growing fraternity of Mexican-American winemakers, many of them farmworkers’ children who now pursue wine business degrees or study viticulture and oenology at the University of California, Davis. “It’s what we have been doing all our lives,” the younger Mr. Robledo said of picking, pruning, trellising, planting and “suckering,” or removing unwanted shoots from vines. “The land is in our DNA.”

For tourists here and in other wine-producing regions, the harvest is an opportunity to swirl, sniff and sip wine, stomp grapes and revel in dinners by master chefs. In Sonoma, visitors can experience an annual “grape camp” whose Web site advertises “three blissful days” picking grapes.

But for members of the three-year-old Napa Sonoma Mexican-American Vintners Association — who have collectively launched some 14 wineries — the cusp of the harvest is a time to celebrate and take stock. At their recent Vendimia, or harvest party, winemakers like Mario Bazán reveled on the Robledos’ patio, the moon rising as if on cue to bathe rows of chardonnay grapes in chiaroscuro-like light.