What Is Happening Inside a Prosecco Cellar in March? A Local Guide Takes You In

Here is the full article — clean, copy-paste ready, all links embedded naturally: What Is Happening Inside a Prosecco Cellar in March? A Local Guide Takes You In The vineyards are bare. The hills are quiet. From the road between Treviso and Valdobbiadene, driving north toward the mountains in early March, the Glera vines look as if nothing is happening — grey, stripped, dormant, the terraced slopes a study in winter restraint. But inside the cantina, everything is moving. I am Igor Scomparin. I was born and raised between Treviso and the Veneto countryside, I have held an official Tour Guide License since 2007, and I have spent the better part of two decades taking guests into the cellars of the Prosecco hills — not to sell them wine, but to help them understand it. What happens inside a Prosecco cantina in March is one of the least-told stories in Italian wine, and one of the most interesting. This article is my attempt to tell it properly. First: What Kind of Wine Are We Talking About? Before I take you into the cellar, a clarification that matters. The Prosecco most people know — the wine that arrives in a tall flute at aperitivo hour, fresh and fizzy and faintly floral, the wine that has been the world’s most consumed Italian denomination for several years running — is Prosecco DOC, produced across nine provinces of Veneto and Friuli Venezia Giulia from the Glera grape and its minor permitted companions. But the wine I am most interested in, and the one whose cellar story is most worth telling, is the Prosecco Superiore DOCG — specifically the Conegliano Valdobbiadene Prosecco Superiore DOCG, produced from the steep hillside vineyards between the towns of Conegliano and Valdobbiadene in the Treviso province. These hills, inscribed on the UNESCO World Heritage List in 2019, represent the historic heart of Prosecco production — the place where the Glera grape was cultivated for centuries before the wine became a global phenomenon, and where the combination of specific soils, altitudes, microclimates, and human knowledge produces a wine of distinctly greater complexity than what you typically find at a supermarket checkout. The denomination covers fifteen communes. It involves more than 3,200 growers and approximately 430 producers. Annual production is around 90 million bottles. And in March, the cellars of those 430 producers are at one of the most active and technically demanding phases of the entire production year. Understanding how Prosecco compares to Champagne and other sparkling wines is a good starting point before you visit — but the cellar story I am about to tell is one that even people who know Champagne production well often find surprising. The Annual Cycle: Where March Fits To understand what is happening in the cantina in March, you need the full arc of the year. It begins in September, when the Glera grapes are harvested. On the steep terraced slopes of the Conegliano Valdobbiadene hills — what viticulturists call heroic viticulture, because the gradient is too severe for mechanised harvesting and the grapes must be picked entirely by hand — the harvest is a period of extraordinary intensity. Families, neighbours, and seasonal workers move along the narrow rows, filling crates that are then carried or winched down the slope to the waiting vehicles below. The harvested grapes go directly to the press. Prosecco production uses soft, pneumatic pressing — gentle extraction that takes only the free-run juice and the finest fraction of the pressed juice, minimising skin contact and preserving the delicate floral and fruity aromas that are the Glera grape’s signature. The resulting must — the fresh grape juice before fermentation — is pale, fragrant, and extraordinarily sensitive to oxidation and temperature. First fermentation follows: the natural sugars in the must are converted to alcohol by selected yeasts over several weeks, producing a base wine that is still, dry, and relatively low in alcohol. This base wine is the raw material from which everything that follows is constructed. Through late autumn and into winter, the base wines from different vineyards, different slopes, different communes within the denomination rest in their tanks. The winemaker tastes, analyses, and begins the slow, patient process of understanding what this year’s harvest has given him to work with. And then, in late winter and early March, the most technically critical phase of the entire production year begins. The Autoclave: Where the Bubbles Are Born The production method that defines Conegliano Valdobbiadene Prosecco Superiore is the Martinotti method — known internationally as the Charmat method, though in Italy the name of Federico Martinotti, the Italian oenologist who developed it in the late nineteenth century, is jealously maintained. It involves a second fermentation not in individual bottles, as in Champagne production, but in large sealed pressurised tanks called autoclaves. Here is what happens in March. The winemaker first completes his blending. The various lots of base wine — which have been kept separate according to their provenance, their harvest dates, their sensory characteristics — are tasted with the focused precision of someone who is essentially constructing an argument from raw materials. A wine from the higher slopes of Valdobbiadene brings a certain mineral quality and freshness. A wine from the lower terraces of Conegliano contributes body and fruit weight. A small addition of one of the minor varieties — Verdiso perhaps, which gives acidity and a particular apple note, or Perera, which adds a pear-like fragrance — adjusts the balance. The final blend, assembled in precise proportions that the winemaker has developed over years or decades of experience with his specific vineyards, goes into the autoclave along with a measured quantity of sugar and a carefully selected yeast culture. The autoclave is sealed. Pressure builds as the yeasts begin consuming the sugar and producing carbon dioxide — the same biological process that happens in a Champagne bottle, but controlled with greater precision and at a scale that allows the winemaker to monitor every stage. The second fermentation in the autoclave lasts at least thirty days under the production rules of the Conegliano Valdobbiadene DOCG. During this period, the yeasts transform the sugar, the pressure rises, the wine gradually acquires its characteristic fine persistent bubbles, and the aromatic compounds that define the style — the white peach, the apple blossom, the wisteria, the faint almond note that appears in the finest examples — begin to develop and integrate. March is the month when many of the cantinas are running their autoclaves at full capacity, producing the wines that will be bottled and released for the spring and summer markets. The cellar in March smells of active fermentation — a faintly yeasty, faintly fruity, distinctly alive scent that is one of the more evocative sensory experiences available in the Veneto. What the Winemaker Is Thinking About I want to take you inside the mind of a winemaker in March, because I think it explains something about why the Prosecco of these hills is different from what you buy in a supermarket. The winemakers I know on the Prosecco Road — the family producers whose cantinas I have been visiting for years, whose grandparents planted some of the vines whose fruit they are now vinifying — spend March in a state of focused attention that visitors to the cellar often find surprising. They are not relaxed. They are watching. They are watching the pressure gauges on the autoclaves. They are watching the temperature — because the second fermentation produces heat, and temperature management during this phase is critical to preserving the delicate aromas that justify the Superiore designation. They are tasting the wine at intervals, monitoring the progression of the fermentation, making small adjustments to the conditions inside the tank. They are thinking, simultaneously, about the wine that is currently fermenting and about the wine they will make next autumn from the vines that are, right now, beginning to push their first green shoots in the bare March vineyards outside. The best of these winemakers have been doing this for long enough that the sequence has become intuitive — they can taste a wine mid-fermentation and know, with a precision that no instrument entirely replicates, whether it is heading where they want it to go. They carry the history of their vineyards in their palates. They know what the south-facing slope above the village produces in a warm year versus a cool one. They know which blend ratio gives them the structure to age gracefully in the bottle for twelve months versus the wine that is best drunk young, fresh, almost immediately after release. This knowledge — accumulated over years, over generations, inseparable from the specific landscape and microclimate of these hills — is what the UNESCO designation was recognising in 2019. Not just the beauty of the terraced slopes. The entire system: the vines, the soil, the people, the knowledge, and the relationship between all three that has been developing since before anyone thought to write it down. The Rive: When Place Really Matters One of the most significant recent developments in Conegliano Valdobbiadene production is the increasing attention to the Rive wines — single-village or single-hamlet wines that represent the most terroir-specific expression of the denomination. There are forty-three officially recognised Rive. Each one comes from a specific village or hamlet within the denomination, with the grapes grown on the steepest vineyards of that specific locality. The wine must be vintage-dated — unlike most Prosecco, which is a non-vintage blend — and must be harvested entirely by hand, which in the case of these steep slopes means harvesting by hand even for producers who use mechanical harvesting on their flatter vineyards. At the absolute pinnacle sits the Superiore di Cartizze — a single cru of just 107 hectares in the municipality of Valdobbiadene, between the hamlets of Santo Stefano, Saccol, and San Pietro di Barbozza, whose ancient soils of moraines, sandstone, and clay, combined with a mild and specific microclimate, produce wines of a complexity and depth that surprise people who come to them expecting ordinary Prosecco. The price reflects this — Cartizze is among the most expensive wines produced in the Veneto — and in March, the small quantity of Cartizze base wine resting in the tanks of the handful of producers who own vines there is being treated with a corresponding level of attention. When I take guests to the Prosecco hills, I always try to include a Cartizze tasting alongside the standard Brut and Extra Dry styles. The difference is not subtle. It is a lesson in what wine can be when a specific place, over centuries, has been coaxed into expressing itself precisely. What a Cellar Visit in March Actually Looks Like Most visitors who come to the Prosecco hills do so in summer or autumn — during the harvest, or in the warm months when the hills are green and the cantina terraces are pleasant for outdoor tastings. These are lovely times to visit. But March offers something different and in many ways more illuminating. In March, the cellar is working. The autoclaves are running. The winemaker has time — not the compressed, harvest-driven urgency of September, not the summer socialising of August — but the focused, thoughtful time of someone in the middle of a technical process they care deeply about. A March visit to a family cantina in the Prosecco hills typically begins in the cellar itself — not in the tasting room but among the tanks, where the winemaker explains what is currently in each vessel, at what stage of production, and why the decisions made in the preceding months have led to the blend now fermenting under pressure. The sensory experience of the cellar in this state — the cool air, the faint active fermentation aroma, the size and solidity of the steel autoclaves against the stone walls of a building that may have been vinifying wine for three or four generations — is genuinely different from a summer tasting on a sun-drenched terrace. Then comes the tasting. In March, a good producer will typically offer the current release alongside, if you are lucky, a still base wine from the current year — the raw, unfermented wine before the second fermentation — which allows you to taste, side by side, what the Glera grape is before and after the autoclave has done its work. The transformation is significant and instructive. The still base wine is austere, almost angular, its aromas subtle and compressed. The finished sparkling wine opens everything up — the bubbles carry the aromatics upward, the dosage (the small addition of sugar that balances the final wine) rounds the edges, and the wine becomes, suddenly, exactly what it was always going to be. This is the Prosecco Road experience at its most honest and most rewarding. Not a tasting room performance, not a scripted presentation, but a working winemaker in a working cellar showing you what he does and why he does it. The Connection to Treviso Everything I have described happens thirty kilometres north of Treviso on a clear road that I have driven hundreds of times. The cantinas of the Prosecco hills are not remote or difficult to access. They are embedded in a landscape of village roads, farmhouses, and hillside terraces that are, in March, as quiet and beautiful as they ever get. The drive from Treviso through Conegliano and into the hills above Valdobbiadene takes under an hour and passes through the heart of the Prosecco DOC production zone — through the flatlands where the standard DOC wines come from, then up into the hills where the Superiore vineyards begin, following the roads that the winemakers’ families have been driving since before the denomination existed. And when you arrive back in Treviso in the late afternoon — after the cellar, after the tasting, after the conversation with a winemaker who has spent thirty years learning the language of these specific hills — you will sit down for the aperitivo hour and raise a glass of Prosecco with a different kind of knowledge. Not the knowledge of a label or a rating. The knowledge of a place. That glass was, not long ago, grapes on a steep slope above Valdobbiadene. It was a winemaker’s decision about blending ratios and fermentation temperature. It was a family’s accumulated understanding of what their hillside produces and how to bring it forward into a glass. That is what I try to give my guests when I take them to the Prosecco hills. Not a wine tour. An education in where they are. 📩 Get in touch to arrange a private Prosecco cellar visit from Treviso. I work with family producers across the Conegliano Valdobbiadene denomination and can build a March cellar experience tailored to your level of wine knowledge and your interests. Frequently Asked Questions What makes Prosecco Superiore DOCG different from regular Prosecco DOC? The distinction is both geographical and qualitative. Prosecco DOC is produced across nine provinces of Veneto and Friuli Venezia Giulia from a broad and relatively flat production zone. Prosecco Superiore DOCG — specifically the Conegliano Valdobbiadene Prosecco Superiore DOCG — comes from a restricted hillside area of just fifteen communes in the Treviso province, where the steep slopes, complex soils of marl and sandstone, and specific microclimates produce Glera grapes of greater aromatic intensity and structural complexity. The DOCG designation, Italy’s highest wine quality classification, requires stricter production rules including lower maximum yields, mandatory hand-harvesting for the Rive and Cartizze wines, and a minimum second fermentation period of thirty days in the autoclave. The result is typically a wine of more pronounced floral and mineral character, greater aromatic depth, and longer finish than standard Prosecco DOC. My guide comparing Prosecco and Champagne explores this in more detail. Is March a good time to visit the Prosecco wineries? March is one of my favourite months to take guests into the Prosecco hills, precisely because it is off-season. The cantinas are quiet — no tour groups, no summer crowds on the tasting terrace — and the winemakers have time to actually talk. You are arriving at the moment when the second fermentation is running in the autoclaves, which means you can see and smell the wine at an active stage of production rather than simply tasting a finished product. The hills in March are bare but beautiful in a particular way — the terraced vine rows are clearly visible against the hillside without the summer foliage, the villages are quiet, and the light on a clear March day has a clarity and crispness that summer haze takes away. For anyone seriously interested in wine, a March cellar visit offers a level of access and conversation that the busy harvest months cannot replicate. What is the Cartizze and why is it considered the finest Prosecco? The Superiore di Cartizze is a single-cru wine produced from a hillside of just 107 hectares in the municipality of Valdobbiadene, divided among the hamlets of Santo Stefano, Saccol, and San Pietro di Barbozza. The soils here — ancient moraines, sandstone, and clay deposited by glacial activity and river action over millennia — combined with a particularly favourable microclimate of cool nights and protected south-facing exposure, produce Glera grapes of exceptional concentration and complexity. The wine tends to be slightly sweeter in style than other Prosecco Superiore wines, with a richness and aromatic depth — ripe stone fruit, white flowers, honey, a mineral undercurrent — that distinguishes it clearly from even the finest standard Superiore. Only a small number of producers own vines in Cartizze, and production is correspondingly limited. A tasting of Cartizze alongside a standard Brut Superiore is one of the most effective single comparisons available for understanding what terroir actually means in this denomination — and it is something I include whenever possible on my private Prosecco Road tours from Treviso. Igor Scomparin is a licensed Tour Guide and Tour Leader for the Veneto Region, certified Travel Agency Director, and founder of tourleadertreviso.com. He has been featured in Rick Steves’ travel guides to Italy and Europe since 2008.