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may eventually find that protecting fruit with shade technology makes sense. At still greater levels of heat stress, changing plant material could become the better long- term investment, the researchers said. Such progression also illustrates why timing matters. Replanting a vineyard or relocating production is expensive and cannot be done quickly. Growers must make decisions before the full effects of a changing climate are apparent, while also avoiding unnecessary investments in tech- nologies or varieties that may not provide sufficient economic returns. For California’s winegrape sector, in which variety, location and reputation are closely intertwined, climate adaptation is not simply a question of whether vine- yards can continue producing grapes. It is a question of which production system can remain economically viable as grow- ing conditions change. The study suggests that, for now, grow- ers have multiple paths. The best one may depend less on whether the climate changes than on how much it changes— and how quickly. “Growers have always adapted to their site, but the pace of change now means those decisions carry real financial weight,” said Markus Keller, science editor of the journal and viticulture professor at Wash- ington State University. “This study gives growers something they haven’t had be- fore: a way to weigh technology, plant ma- terial and location against each other in dollar terms, not just growing conditions.”
Under the most severe heat scenario ex- amined, changing to a more heat-tolerant variety produced the strongest economic return, the study said. Moving the vineyard to a cooler region was less attractive than the other strate- gies across the scenarios examined. The study’s results indicate that migration trailed the other options under every modeled scenario. The findings don’t mean growers should immediately begin changing varieties or installing shade cloth. Rather, the research provides a framework for considering when the expected benefits of an adap- tation measure are likely to outweigh its costs. Such a distinction could be import- ant for California growers, whose vine- yards represent long-term investments and grape prices can vary substantially by variety and appellation. The researchers also considered a fac- tor that can be overlooked in discussions about vineyard adaptation: what consum- ers are willing to pay. The team surveyed more than 300 U.S. wine consumers in early 2024 using hypothetical wine labels representing the different adaptation strat- egies. Consumers were asked how much they would be willing to pay after learning that a wine had been produced using a particular climate adaptation approach. The results suggested consumers could reward growers and wineries for adapting to climate change—at least initially.
Using cabernet sauvignon production in Napa County as a case study, new research findings concluded no single right answer for how winegrape growers should contend with severe heat.
Consumers indicated a willingness to pay about 17% more, on average, for wine when they were told shade technology had been used to protect grapes from extreme heat, the research found. Wines made from a different, more heat-tolerant variety received a roughly 12% premium when the variety change was explained as a climate adaptation. Moving production to a different region generated a premium of about 11%. The findings could give producers an- other economic incentive to communicate adaptation decisions to consumers. But the researchers did not assume the premiums would last indefinitely. The study modeled the consumer premiums as temporary, reflecting the possibility that
buyers could become accustomed to cli- mate-adaptation practices as they become more common. The study’s broader message is that cli- mate adaptation needs to be considered in economic and agronomic terms. Growers already make decisions about irrigation, canopy management, root- stocks, varieties and vineyard sites based on expected production and quality. In- creasing heat adds another variable to those calculations. For a premium cabernet sauvignon vineyard in a relatively favorable climate, maintaining the existing system may remain the best financial decision for years, the study indicated. A grower fac- ing more frequent heat events, however,
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September 16, 2026 Ag Alert 15
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