Wine Wednesday: What happens during harvest?

By: Cecily G


Happy #WineWednesday fellow wine-os! Today, we are going to veer slightly away from our weekly Rhône 101 lessons to talk about a topic that is very relevant this time of year: harvest! Don’t worry, we will be back to your regularly scheduled programming in no time. ;) We’re going to go through the what, when, why, where, and how of this exciting and crucial winemaking process!


What?

The harvesting (or “picking”) of grapes for wine is something that happens every year, and is what separates each wine into vintages (the year the wine grapes were harvested, often found on the label of a wine).


When?

In California, wine grapes are generally harvested between August and October, depending on the grape varietal. The exact date of harvest is dependent on sugar, acid, and tannin levels in the grapes, as well as weather. Certain vineyards, blocks, or even rows may be harvested on different days over the course of a harvest season because of these factors. Time of day is important during harvest as well, as too warm temperatures may cause the grapes to prematurely ferment. Picking at night or very early in the morning, when it’s the coolest, is the most optimal time.


Why?

Harvest happens once the grapes have completed verasion (the turning of color in the grapes, leading to the maturing of the berries). Grapes are ready to be harvested once the sugars in the berries reach a certain level. Winemakers can taste the grapes to see if the sugars are high enough in the berries for harvesting, or use a tool called a refractometer.


Winemaker checks sugar levels using a refractometer..

Where?

The process of harvest starts in the vineyard. Once picked grapes are in the bins, the fruit moves to the winery crush pad, where they are sorted for quality. After being sorted, the grapes are de-stemmed and crushed, and move on to the next steps of the winemaking process.


Grape harvesting machine

How?

Grapes are harvested by hand or by machine. When grapes are hand harvested, workers head out to the vineyard with shears and bins, pick, and add them to a larger bin on a truck or tractor. Hand harvesting is more labor intensive, but is preferred because the quality of grapes harvested is much higher, as any under ripe, or undesirable grapes will not make the cut.


Harvest is a beautiful, busy, and exciting time of the year in wine country. Looking to celebrate the season in Sonoma? Check out this post for events and ways to get involved. Cheers!


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