Sweetness and Acidity

How to taste sweetness and acidity, why they mask each other, and how their balance forms a wine's first structure. Also why the cool Willamette Valley climate keeps grapes' acid, and where the 2026 harvest stood in mid-October. This episode is narrated by AI-generated synthetic voices. Episode page & show notes Visit website Sugar, sour, and how they hide each other Residual sugar is the grape sugar yeast leaves behind in the finished wine. It is measured in grams per liter, and most tasters miss it below about two to four (how residual sugar works). The four-step sweetness scale runs dry, off-dry, medium and sweet. European rules let a high-acid wine stay "dry" up to nine grams per liter (international sweetness standards and the WSET approach). Ripe-fruit aromas and high alcohol can make a dry wine seem sweet. To check, pinch your nose shut during a sip: fruit you smell drops away, while sugar you taste remains. "Fruity but dry" is often the right call. Acidity comes mainly from tartaric acid, which is steady, and malic acid, which has a green-apple sharpness. Malolactic conversion turns malic acid into softer lactic acid, and a winemaker can choose how far it goes: Ricochet Wine Co. put its 2023 Pinot blanc through full conversion but stopped the conversion short in its 2023 Confluence Rosé to keep the wine's acidity. To rate acidity as low, medium or high, wait after swallowing or spitting and notice how much your mouth waters, and for how long. That works even in sweet wines (understanding acidity in wine). Sugar masks sourness and acid masks sweetness, the way sugar changes lemonade (acid, sweetness and tannin on the palate). Judging how the two sit together is balance, the first piece of structure. An optional two-wine exercise compares a dry white with an off-dry Riesling. Why Willamette grapes stay fresh Most of the valley falls in the coolest heat class. Cool Pacific air comes in through the Van Duzer Corridor, and days and nights can differ by twenty-five to thirty-five degrees. Grapes burn malic acid fastest in heat above about eighty-six degrees, so cool afternoons and cold nights help them keep it (ripeness in viticulture). Picking means trading sugar against acid while watching for autumn rain. Winemakers track sugar in degrees Brix, test acid, and taste the fruit (must analysis basics). Still Pinot noir is often picked around 22 to 24.5 Brix. Fruit for sparkling wine is picked earlier, around 18.5 to 20.5. The 2026 harvest so far Picking began around the start of September, with sparkling-wine fruit first. By early to mid October, harvest was in full swing or wrapping up (harvest in full swing). Growers reported an early budbreak, and in early summer they called the season moderate so far, though late May brought one very hot week. Smoke from the Grasshopper Fire reached the valley in early August; whether it marked the wines will not be known until they are finished. Final tonnage is not counted yet. The season follows a 2025 in which Oregon grape production fell 25 percent. Industry opinion so far is hopeful, but the finished wines will show whether that holds.