For several decades, the grape harvest has been moving earlier in many vineyards. Where some harvests once took place at the end of September, they can now begin several days or even several weeks earlier. This shift is directly linked to climate change, rising temperatures and the acceleration of the vine's cycle.
For winegrowers, this earliness does not only change the calendar. It also affects the ripening of the grapes, their sugar level, acidity, aromas and the final balance of the wine.
A vine cycle that starts earlier
The vine goes through several stages during the year: budburst, flowering, veraison and then ripening.
When temperatures are higher from late winter and into spring, budburst can begin earlier. Flowering can then come forward, and ripening also arrives more quickly.
The vine therefore gets ahead from the very start of its cycle.
This lead naturally carries through to harvest time.
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Rising temperatures speed up ripening
Temperature plays a major role in grape development.
With more heat, sugar accumulates more quickly in the berries.
The grapes can therefore reach the ripeness the grower is looking for sooner.
This largely explains why early harvests are becoming more and more frequent.
But rapid ripening is not always easy to manage.
More sugar, so potentially more alcohol
The sugar in the grapes is turned into alcohol during fermentation.
When grapes ripen faster, their sugar concentration can rise quickly.
If the grower waits too long, the wine can end up higher in alcohol.
Bringing the harvest date forward can then help preserve better balance.
Choosing when to harvest therefore becomes essential.
Acidity falls more quickly
Acidity plays a central role in wine.
It brings freshness and tension and contributes to ageing potential.
Under high temperatures, acidity can drop rapidly during ripening.
Producers may then choose to harvest earlier to avoid losing too much freshness.
But they must also avoid picking before the grapes are ripe enough.
It is all a matter of balance.
Drought also affects the grapes
Rising temperatures often come with episodes of drought.
When the vine lacks water, it can suffer water stress.
The berries can become smaller and more concentrated.
Depending on conditions, this can change the pace of ripening.
Some plots may also suffer more than others depending on the soil or their exposure.
Terroir therefore plays an important role in how the vine reacts.
Early harvests are becoming more common
Early harvests no longer concern only a few exceptional years.
In several French regions, harvest dates have gradually moved earlier over the decades.
Champagne, Burgundy, Alsace and the Rhône Valley are all affected.
Historical records show that harvest dates are now often earlier than they once were.
This trend confirms the impact of climate change on winegrowing.
Aromas can change too
Heat does not only affect sugar and acidity.
It can also influence the grapes' aromatic profile.
Rapid ripening can produce riper, sunnier and sometimes richer aromas.
Some estates therefore choose to harvest earlier to keep more freshness and an aromatic profile closer to the style they are aiming for.
The harvest date then becomes a genuine stylistic choice.
Not all ripeness progresses together
A major difficulty is that not all parts of the grape ripen at the same pace.
Sugar can rise quickly while the seeds, skins or tannins may still need time.
Aromatic ripeness can also develop differently.
The grower must therefore monitor several factors before deciding to pick.
Looking only at sugar levels is not enough.
Spring frost remains a risk
Climate change also creates a paradox.
Milder temperatures at the end of winter can trigger early budburst.
But if frost strikes afterwards, the young shoots are particularly vulnerable.
The vine can therefore start earlier while remaining exposed to serious risks.
This forces growers to adapt their work from the very start of the season.
Terroir can slow down or speed up ripening
Not all vineyards react in the same way.
Altitude, exposure, soil type and air circulation strongly influence temperature and water availability.
Some cooler plots can now become particularly interesting.
Conversely, very exposed areas can reach ripeness much faster.
Climate change is therefore also changing how certain terroirs are perceived.
Vineyard practices are evolving
Faced with this earliness, producers are adapting their methods.
They may change canopy management, keep more shade around the bunches, adapt soil work or look for later-ripening grape varieties.
Some practices also aim to limit water stress and slow ripening.
The goal remains the same: to preserve the grapes' balance.
An increasingly strategic harvest date
Choosing the harvest day is becoming one of the most important decisions of the vintage.
A few days can change the balance between sugar, acidity, aromas and ripeness.
Harvesting early often preserves more freshness.
Waiting can bring more ripeness and richness.
The best moment therefore depends on the grape variety, the terroir and the style of wine being sought.
Why is the harvest really moving earlier?
The main reason is the acceleration of the vine's cycle.
Higher temperatures encourage faster budburst, earlier flowering and advanced ripening.
Drought and heatwaves sometimes reinforce this phenomenon further.
The harvest therefore starts earlier, but the challenge is not just about changing a date on the calendar.
Above all, it is about preserving the balance between sugar, acidity, freshness and aromatic ripeness.
It is this search for balance that makes early harvests one of the great challenges of modern winegrowing.
