Winemaking · Guide

Sauvignon Blanc Wine: Fermentation and Winemaking Guide

A complete guide to making Sauvignon Blanc at home. Covers grape handling, cold fermentation in stainless steel, aromatic thiol preservation, MLF decisions, sur lie aging, and bottling timeline.

Updated August 2026 13 min read Brewing

Sauvignon Blanc is one of the most expressive white grapes in the world. Its best wines burst with aromas of grapefruit, passionfruit, gooseberry, and fresh-cut grass. These aromatics come from volatile thiol compounds in the grape, and preserving them is the central challenge of Sauvignon Blanc winemaking. Every decision from harvest to bottle, temperature, oxygen exposure, yeast choice, and aging vessel, either protects or destroys those compounds. This guide covers the full process, with specific techniques for producing a bright, aromatic wine at home.

Sauvignon Blanc grape character

Sauvignon Blanc is defined by high natural acidity and intense aromatic potential. The grape accumulates volatile thiol precursors (cysteine-bound and glutathione-bound thiols) in its skin and juice during ripening. These precursors are odorless in the grape. They become the powerful tropical and citrus aromas only after yeast cleaves them during fermentation.

Acidity profile Sauvignon Blanc naturally produces high levels of malic and tartaric acid. Grapes harvested at 20-23°Brix typically carry a titratable acidity (TA) of 7-10 g/L and a pH of 3.1-3.3. This high acidity gives the wine its crisp, mouthwatering character and also provides natural protection against spoilage. Do not adjust acidity downward unless pH is below 3.0.

Aromatic thiols The signature aromas of Sauvignon Blanc, grapefruit (3MH), passionfruit (3MHA), and boxwood, are all thiol compounds. They exist as non-volatile precursors in the juice and are released by specific yeast enzymes during fermentation. Thiol production depends on yeast strain, fermentation temperature, and must turbidity. Clear juice fermented cold with a thiol-releasing yeast produces the most aromatic wine.

Methoxypyrazines Green, herbaceous aromas (bell pepper, jalapeño, fresh-cut grass) come from methoxypyrazines, which are present in the grape and not produced by yeast. These compounds are heat-stable and survive fermentation. In cool climates (Loire Valley, Marlborough), methoxypyrazines are more concentrated. Warmer vintages or later harvest dates reduce their intensity.

20-23°Bx typical Sauvignon Blanc harvest Brix

3.1-3.3 target juice pH range

7-10 g/L typical titratable acidity at harvest

Harvest, pressing, and juice preparation

Sauvignon Blanc winemaking begins with protective handling from the moment grapes leave the vine. Oxidation is the enemy. Bruised, warm grapes exposed to air begin losing aromatic potential immediately. Speed and cold temperatures are your best tools during this stage.

1
Harvest cool, process fast Pick grapes in the early morning when temperatures are lowest. If that is not possible, chill the grapes in bins with dry ice before processing. The goal is to keep fruit temperature below 60°F (15°C) from harvest through pressing. Warm fruit oxidizes rapidly.
2
Whole-cluster press Press Sauvignon Blanc as whole clusters without crushing or destemming. Whole-cluster pressing yields cleaner, less phenolic juice because you avoid extracting bitter compounds from crushed skins and stems. Use a bladder or basket press at gentle pressure. The first free-run and light press fractions produce the finest wine.
3
Add sulfite to the juice Add potassium metabisulfite at 50 ppm immediately after pressing. This binds oxygen, suppresses wild yeast, and protects the juice from browning. Sauvignon Blanc juice oxidizes faster than most white varieties because of its phenolic composition.
4
Cold settle for 24-48 hours Chill the juice to 45-50°F (7-10°C) and let solids settle for 24-48 hours. Rack the clear juice off the heavy sediment. Aim for a moderate level of juice turbidity (50-100 NTU if you can measure it). Perfectly clear juice produces a thinner, less aromatic wine. Some suspended solids actually help yeast produce more thiols during fermentation.

! Watch for

Do not skin-soak or cold-macerate Sauvignon Blanc grapes the way you would a red wine. Extended skin contact extracts phenolics that cause bitterness and browning in white wines.
Never let unsulfited juice sit at warm temperatures. Oxidation and spontaneous fermentation will begin within hours, and both degrade aromatic quality.
Avoid settling juice too clear. Very clear juice (below 25 NTU) reduces thiol production during fermentation and produces a less aromatic wine.

Cold fermentation for aromatic preservation

Temperature is the single most influential variable in Sauvignon Blanc winemaking. Cold fermentation (45-55°F / 7-13°C) slows yeast activity and retains the volatile thiol compounds that define the grape’s character. Warm fermentation drives these compounds out of the wine and into the headspace, where they are lost.

Yeast selection matters Choose a yeast strain with documented thiol-releasing activity. Lalvin QA23 is a solid general choice for crisp, aromatic whites. VL3 (Laffort) is bred specifically for thiol release in Sauvignon Blanc and produces the most intense tropical aromas. Cross Evolution (Lallemand) works well at very cold temperatures. Rehydrate dry yeast with Go-Ferm at 104°F (40°C) for 20 minutes before pitching into the cold juice.

Fermentation vessel Stainless steel is the standard for Sauvignon Blanc. It is inert (adds no flavor), easy to sanitize, and allows precise temperature control with a glycol jacket or cooling coil. Home winemakers using glass carboys or plastic fermenters can control temperature by placing the vessel in a chest freezer with an external temperature controller (Inkbird ITC-308 or similar).

Fermentation duration Cold fermentation is slow. A Sauvignon Blanc fermenting at 48°F (9°C) may take 3-5 weeks to reach dryness, compared to 7-10 days at 65°F (18°C). This is normal and desirable. Monitor gravity weekly with a hydrometer. Do not warm the wine to speed things up unless fermentation stalls completely.

Nutrient management during cold fermentation Cold, slow fermentation stresses yeast. Proper nutrition prevents stuck fermentation and off-aromas like hydrogen sulfide (rotten eggs). Add a complex nutrient blend (Fermaid-O or equivalent) in two stages: the first addition at 24 hours after yeast pitch, and the second when gravity has dropped by one-third. Total YAN should reach 200-250 ppm for a clean fermentation.

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Malolactic fermentation: skip it or use it

The default approach for Sauvignon Blanc is to prevent malolactic fermentation (MLF) entirely. MLF converts malic acid (tart, green apple) to lactic acid (softer, milky), and most winemakers want to preserve Sauvignon Blanc’s natural bright acidity. There is one notable exception.

Classic style: block MLF For New Zealand, Loire Valley, or any crisp, aromatic style of Sauvignon Blanc, prevent MLF by adding sulfite (50 ppm SO2) immediately after primary fermentation is complete. Store the wine below 59°F (15°C) and maintain adequate free SO2 (25-35 ppm) throughout aging. This preserves the sharp, mouthwatering acidity that defines the variety.

Bordeaux style: partial MLF In Pessac-Leognan and Graves, Sauvignon Blanc is often barrel-fermented and taken through partial MLF. This softens acidity, adds creaminess, and produces a richer, more complex wine. To do partial MLF at home, let the wine undergo natural malolactic conversion until you taste the desired level of softness, then add sulfite to stop the process.

Signs of unwanted MLF If Sauvignon Blanc develops a milky or yogurt-like aroma after primary fermentation, MLF may have started spontaneously. Test the wine with paper chromatography. If malic acid is decreasing and you did not intend MLF, add sulfite immediately and chill the wine. Spontaneous MLF produces less predictable results than inoculated MLF and can generate biogenic amines.

Preventing oxidation throughout the process

Sauvignon Blanc is among the most oxidation-sensitive white wine grapes. The thiol compounds that produce its tropical and citrus aromas degrade rapidly in the presence of oxygen. Protective (reductive) winemaking practices are not optional for this variety. They are the difference between a vibrant, expressive wine and a flat, dull one.

Use inert gas Blanket the wine with CO2 or nitrogen at every transfer, racking, and topping event. After fermentation, the headspace in your carboy or tank should be purged with inert gas. A small canister of food-grade CO2 or argon with a regulator is one of the best investments a white wine maker can own.

Minimize rackings Each racking exposes the wine to oxygen, even with careful technique. Rack Sauvignon Blanc no more than 2-3 times total before bottling: once off the gross lees after fermentation, once before fining if needed, and once into the bottling vessel. Use a siphon with a gentle flow rate and keep the receiving vessel purged with inert gas.

Ascorbic acid as backup Some winemakers add ascorbic acid (vitamin C) at 50-75 ppm along with sulfite before bottling as extra antioxidant protection. Ascorbic acid scavenges dissolved oxygen before it can react with wine components. Always pair it with adequate SO2, as ascorbic acid without sulfite can actually accelerate oxidation through hydrogen peroxide formation.

! Watch for

Do not leave headspace in carboys or tanks during aging. Even a small air gap causes measurable oxidation over weeks. Top off with a similar wine or use inert gas.
Do not use oak barrels for Sauvignon Blanc unless you specifically want an oaked style. Barrel staves are permeable to oxygen, and the micro-oxygenation that benefits red wines will degrade a white wine meant to be fresh and aromatic.
Replace silicone bungs annually. Older bungs lose their seal and allow oxygen ingress during aging.

Sur lie aging and batonnage

Sur lie aging (aging on the fine lees) adds body, texture, and complexity to Sauvignon Blanc without masking its varietal character. Fine lees are dead yeast cells that settle after fermentation. As they break down (autolyse), they release mannoproteins and amino acids into the wine, giving it a richer mouthfeel and subtle bready or toasty notes.

1
Rack off gross lees After primary fermentation, rack the wine off the heavy sediment (grape solids, dead yeast clumps, and debris) within 48-72 hours. This gross lees can produce sulfury off-aromas if left in contact too long. Leave the fine, powdery lees behind in the clean vessel.
2
Age on fine lees for 2-4 months The fine lees settle as a thin, pale layer at the bottom of the carboy or tank. Leave the wine in contact with this layer for 2-4 months. The mannoproteins released during autolysis improve mouthfeel, enhance palate weight, and can help stabilize the wine against tartrate precipitation.
3
Stir the lees periodically (batonnage) Once a week for the first month, then once every two weeks after that, gently stir the lees back into suspension with a sanitized stainless steel rod or by rocking the carboy. This accelerates autolysis and distributes the mannoproteins evenly. Stop stirring 4-6 weeks before bottling to allow the wine to clarify.
4
Rack, fine, and prepare for bottling After the desired sur lie contact time, rack the wine off the lees. If the wine is still hazy, fine with bentonite (0.5-1 g/L) to remove unstable proteins that cause haze. Cold stabilize at 28-32°F (-2 to 0°C) for 2 weeks to drop tartrate crystals. Filter if desired (0.45 micron for sterile filtration) and bottle.

Monitoring during sur lie aging Test free SO2 every 4-6 weeks during lees contact. Lees bind sulfite, so SO2 levels drop faster than in clear wine. Maintain free SO2 at 25-35 ppm. If the wine develops a struck-flint or burnt-rubber aroma (too reductive), rack it off the lees with moderate aeration to blow off the excess sulfur compounds.

Bottling timeline Most Sauvignon Blanc should be bottled 4-8 months after harvest. The wine is at its most expressive and aromatic in the first year. Unlike Cabernet, which improves with extended aging, Sauvignon Blanc loses its freshness and thiol-driven aromatics over time. Drink within 1-3 years of vintage for the best experience.

Sauvignon Blanc winemaking is a study in restraint. The grape gives you everything you need in terms of acidity, aroma, and flavor. Your job is to preserve what the grape provides rather than adding to it. Cold fermentation, minimal oxygen exposure, clean handling, and a short aging window produce a wine that captures the grape at its most vibrant.

FAQ

Frequently asked questions

What temperature should Sauvignon Blanc ferment at?+

Ferment Sauvignon Blanc at 45-55°F (7-13°C). Cold fermentation slows yeast activity and preserves the volatile thiol compounds (3MH and 3MHA) that give the grape its signature grapefruit, passionfruit, and gooseberry aromas. Warmer fermentation temperatures (above 60°F / 15°C) cause these aromatic compounds to volatilize and disappear. The trade-off is that cold fermentation takes longer, typically 3-5 weeks compared to 1-2 weeks at warmer temperatures.

Should Sauvignon Blanc go through malolactic fermentation?+

No, not in most cases. Sauvignon Blanc's defining characteristic is its bright, crisp acidity. Malolactic fermentation converts malic acid to the softer lactic acid, which would dull that acidity and flatten the wine's profile. Add sulfite (50 ppm SO2) after primary fermentation to prevent spontaneous MLF. The exception is oak-fermented Sauvignon Blanc in the Bordeaux style, where partial MLF can add creaminess and complexity.

What yeast should I use for Sauvignon Blanc?+

Yeast strains that enhance thiol release produce the most aromatic Sauvignon Blanc. Lalvin QA23 is a reliable all-purpose choice for crisp, clean whites. VL3 (Laffort) is specifically selected for thiol-releasing activity and produces intense tropical and citrus aromas. Cross Evolution (Lallemand) works at low temperatures and maximizes aromatic complexity. Avoid high-ester yeasts designed for reds, as they will overpower the delicate varietal character.

How long should Sauvignon Blanc age before bottling?+

Most Sauvignon Blanc should be bottled within 6-9 months of harvest. The wine's appeal lies in its freshness and bright aromatics, both of which fade with extended aging. After primary fermentation, age on fine lees for 2-4 months with periodic stirring (batonnage), then fine, filter, and bottle. Sauvignon Blanc is generally meant to be consumed within 1-3 years of vintage, though some oak-aged styles from Bordeaux can age longer.

Should I ferment Sauvignon Blanc in oak or stainless steel?+

Stainless steel is the standard vessel for Sauvignon Blanc because it preserves the grape's bright, crisp character without adding oak flavors. This is the New Zealand and Loire Valley style. Oak fermentation (neutral or new French barrels) produces a richer, rounder wine with more body and complexity. This is the Bordeaux (Pessac-Leognan) style. Neither is better. They produce fundamentally different wines from the same grape.

What is protective winemaking for Sauvignon Blanc?+

Protective (reductive) winemaking minimizes the wine's exposure to oxygen at every step. This means blanketing the must and wine with inert gas (CO2 or nitrogen), using adequate sulfite additions, keeping vessels topped and sealed, and avoiding unnecessary rackings. Oxygen degrades the thiol compounds that define Sauvignon Blanc's aroma. Even small amounts of oxidation can dull a wine that should smell like fresh-cut grass and grapefruit.