California’s 2026 winegrape harvest could be 80% complete by late September, squeezing contract talks.

California’s 2026 winegrape harvest is moving faster than usual and yields are generally lighter than average, prompting cautious buying by some grape purchasers even as the broader wine market remains under pressure, according to a September market report released Friday by Ciatti Company and Robert Selby.

The report said the early pace of the harvest has continued across the state and that more than 80% of picking could be finished by the end of September. That would leave growers, wineries and brokers with less time than normal to adjust to changing crop estimates and fill supply gaps before the season closes.

Ciatti said some grape buyers have entered the market to replace missing volumes as lighter-than-average yields become clearer. But the report drew a distinction between a crop that is lighter and one that is truly short. It said replacement fruit can still be found because a large amount of grapes remains uncontracted.

That dynamic matters because it suggests that lower yields alone have not tightened the market enough to erase a wider oversupply problem that has built up in California wine. In Ciatti’s view, the industry’s deeper issue remains weak case-good sales, which continue to weigh on contracting, pricing and broader demand for grapes and bulk wine.

The report described buyer activity as cautious rather than aggressive. It said harvest losses or lower-than-expected tonnage have pushed some buyers to look for fruit, but it also noted that other market signals do not point to a strong recovery. Bulk-wine activity, multi-year contracting levels and pricing all indicate that the basic imbalance between supply and demand has not changed in a major way, the report said.

Ciatti tied that imbalance to slow sales at the consumer level. The report said negative case-good sales volumes are still the main problem for the industry. It also referred to the latest SipSource data on U.S. wholesaler depletions and raised the question of whether signs of stabilization may be starting to appear, though the email preview did not provide specific depletion figures.

The timing of this year’s harvest is adding urgency to negotiations now taking place in the field. As the report put it, conversations between prospective buyers and growers need to be clear at this stage of the season. Ciatti said the parties must agree on the condition the vineyard should be in before grapes are contracted and whether the offered price covers the remaining farming work still required before picking.

That warning reflects the practical limits of a late-season deal. When a buyer steps in close to harvest, there may be unresolved questions about irrigation, canopy management, crop load, fruit condition and the cost of final vineyard passes. With less time left in the season, disagreements over those details can quickly affect whether a deal closes.

The report did not say that lighter yields have created broad scarcity across California. Instead, it suggested a more mixed picture. Some buyers are active because their original volume assumptions have come up short, but the amount of uncommitted fruit still available means supply can often be replaced without major difficulty. The main constraint, Ciatti said, is no longer just availability. It is the calendar.

That calendar is also shaping attention beyond the 2026 crop. With harvest moving rapidly toward completion and the final quarter of the year approaching, the report said the market is already beginning to focus on 2027. Ciatti warned that vineyard removals next year could exceed the amount pulled out this year if grape demand does not improve in a meaningful way by the end of the first quarter.

That prospect underscores how persistent the downturn has been for many growers. If wineries and other buyers do not increase pre-harvest demand, more acres may be taken out of production as growers respond to weak returns and uncertain placement opportunities. The report framed that risk as a real possibility rather than a remote scenario.

Ciatti also used the report to encourage market participants to make their positions known early. It urged growers to update the company on grapes they have available and invited bulk wine suppliers to list wines and submit samples so buyer interest can be matched quickly as it develops. The brokerage likewise asked prospective grape buyers to register potential needs in advance so growers can be notified.

The report’s message points to a market that is active, but not yet healthy. Lighter yields are creating selective buying opportunities and may support some late-season transactions. Still, the broader indicators cited by Ciatti suggest that California’s wine sector is continuing to deal with weak downstream demand, large uncontracted supplies and ongoing uncertainty about how much production the market can absorb.

In that setting, the final weeks of harvest are likely to be shaped by short timelines, selective purchases and close attention to vineyard condition, contract terms and price. The faster-than-normal pace of picking has compressed decisions that in other years might have unfolded over a longer period, leaving growers and buyers to make adjustments in a narrower window as the 2026 crush moves toward completion.