Just a few days ago, the Harvest Moon, what often appears as the closest full moon in the northern hemisphere, lit up the skies. It is the traditional name for the full moon closest to the autumn equinox which this year it took place on September 26th.
Its name has a very practical reason. For centuries, in the days near the equinox, the light of this moon allowed farmers to extend their harvest days after sunset.
This year, the coincidence is especially interesting because many grape harvests also arrived earlier. In Champagne, for example, the first vineyards began to be harvested on August 6th, and the widespread picking started about two weeks earlier than in 2025. In Navarra, the first grapes began to be picked at the beginning of August due to the summer heat.
The Harvest Moon reminds us of something we sometimes forget: for thousands of years, agriculture has depended on observing not just the plant, but also the seasons, the daylight hours, and the sky.
Today we have weather stations, laboratory analyses, and applications capable of telling us if it’s going to rain in forty minutes.
And yet, when harvest time comes, we all end up doing something very similar to what farmers did centuries ago: we look at the sky.
The Harvest Moon marked a time of year. The grape continues to mark the exact moment.
The story of a harvest begins long before
Harvesting grapes to make wine is a practice thousands of years old. Long before we could measure sugar, pH, or acidity in a laboratory, someone had to walk through the vineyard, taste the fruit, and decide when the time had come to pick it.
Technology has changed enormously. The essential question, not so much: When is this grape ready to become the wine we want to make?
Today we can measure sugars and acidity, analyze pH, and follow the evolution of ripeness with great precision. But numbers don't replace the winemaker. You also have to taste.
Is the skin ripe?
The seeds?
How does the fruit taste?
What texture does it have?
How is the acidity?
Is a storm approaching?
Do we wait three more days or harvest tomorrow?
Each answer can change the wine.
The climate leaves its signature
No harvest is exactly the same as another because no year is. A cold spring can delay the cycle. Rain during flowering can affect the quantity of fruit. A dry season can reduce the size of the berries. A heatwave can accelerate sugar accumulation while other components of the grape ripen at a different pace. Even a few weeks before harvest, the weather can still change the decisions.
In Rioja, for example, the technical monitoring of the 2026 ripening showed the effect of high temperatures on parameters such as sugar, total acidity, and malic acid.
That is why we talk about vintages. A vintage is not just the number printed on a label. It is the record of everything that happened during an agricultural cycle and, also, of how the person who cared for the vineyard responded. The climate poses the conditions. The winemaker makes decisions within them.
One of the most important decisions happened many months earlier
When we look at a perfectly ripe cluster during the harvest, it is easy to think that the quality of that fruit was decided during the summer. In reality, an important part of the story began during the winter. We talked about it in the last blog - Pruning.
When the vine loses its leaves and enters dormancy, the winemaker decides which wood to keep and how many buds to leave for the following season. It seems like a simple operation - cutting branches. It's not.
Pruning helps determine how many shoots the plant will be able to develop and, with them, what its production potential will be. It also intervenes in the balance between the amount of fruit and the leaf surface area that will have to ripen it.
Leaving too much of a load for the capacity of a vine can hinder a balanced ripening. But pruning a lot doesn't automatically mean getting better fruit either. Too severe a pruning can alter the plant's balance and favor excessive vigor. That is why there is no universal formula.
An old vine on a dry hillside doesn't necessarily need the same pruning as a young vine in deep soil. The variety, the climate, the age of the plant, the soil, the available water, and the style of wine that is sought to be produced are all part of the decision.
Much of what we pick in September began with a pair of pruning shears in winter.
And when is the harvest?
Perhaps this is the most visible decision of all. If harvest is too early, ripeness may be lacking. If it is waited on too long, sugars can increase while acidity decreases and the fruit's character changes.
But there is no magic number either. Two plots of the same variety, even a short distance from one another, can be ready at different times. A different orientation, a few meters more of altitude, the age of the vines, or a soil that retains more water can modify the ripening pace. That is why many small producers harvest the plots separately. They aren't waiting for the harvest. They are waiting for the harvest of each place.
To harvest is to choose
It also matters how the fruit reaches the winery. In many mountain vineyards or those with old vines, the harvest is done by hand. This allows for selecting clusters directly in the vineyard and working in places where a machine simply could not enter. None of the producers we bring in use machines to harvest. It can significantly lower the quality of what reaches the winery. However, I include it to see how many stages and decisions go into the bottle we enjoy at the table.
Some producers harvest very early in the morning so that the grapes arrive fresh. Others use small crates to prevent the weight from breaking the fruit before it reaches the winery. Each of those decisions seems small, but together they start to define the wine.
And during those weeks, hundreds of important decisions are made. Some with laboratory analysis. Others with decades of experience. And a few, probably, after little sleep and too much coffee.
The work doesn't end when harvest the fruit
After an entire year waiting for the harvest, the grapes enter the winery and another series of decisions begins.
Destem or use whole clusters?
Crush or leave the berries intact?
Macerate before fermenting?
Ferment in steel, concrete, wood, or clay?
With yeasts present naturally on the grape and the winery or with selected yeasts?
How long do we leave the skins in contact with the wine?
Do we perform pump-overs?
Do we punch down the cap?
Do we extract more or less?
Do we allow malolactic fermentation?
Do we age the wine in barrels, foudres, concrete, steel, or amphorae? For how long?
The harvest provides the raw material. The winery decides how to accompany it. And here something fundamental appears again. The fact that the fruit has reached the winery does not mean that the difficult decisions have ended. They only moved location.
For many of the small producers we select at Sarah’s Wines, the intention is not to correct the vineyard in the winery, but to intervene as much as necessary to allow the fruit to preserve its identity. That also requires decisions. Sometimes, even deciding not to act.
An entire year inside a bottle
Perhaps that's why the harvest has something so special. It is celebration, but also exhaustion. There is emotion, urgency, uncertainty, and very little sleep. It is the end of months of work, but it's not the end of anything.
When the last crates enter the winery, the viticulturist and the winemaker can finally look at the fruit and recognize in it the year they have just lived: the winter in which they decided how to prune, that frost that caused worry in spring, the rains that arrived —or didn't arrive—, the summer heat, and all the small decisions made between one thing and another.
Afterward, fermentation will begin. Later, the aging will arrive. And a while after, a bottle will reach our table.
Perhaps that is one of the most fascinating things about wine: when we open a bottle, we are not just drinking a grape variety or a place. We are opening a year of climate, work, and decisions. And all of that started long before someone harvested the first cluster.
