Chardonnay Winemaking Styles: Oaked vs Unoaked

Chardonnay's great strength is its neutrality — a relatively neutral grape variety that expresses terroir and winemaker intent rather than dominant varietal character. This makes it infinitely adaptable, but also means the winemaker's decisions have outsized influence on the final wine. Understanding those decisions is key to making Chardonnay with intention.

The Stylistic Spectrum

Chardonnay wines span an enormous range:

You can land anywhere on this spectrum intentionally.

Harvest Timing

Chardonnay ripens relatively quickly and is sensitive to timing:

• Early pick (low Brix, high TA, low pH): lean, citrus-forward, naturally high acid. Ideal for Chablis style. Risks: unripe or "green" character if too early.
• Mid-season pick (23–24 Brix, moderate acid): balanced, versatile. Works for most styles.
• Late pick (25+ Brix, low acid): tropical fruit, lower natural acidity, full body. Needs acid addition in most climates.

Target pH: 3.1–3.4. TA: 6.5–9 g/L for unoaked; 6–7.5 g/L for oaked styles.

Pressing and Must Handling

Chardonnay is almost universally whole-bunch or destemmed-and-pressed rather than fermented on skins. The goal is to extract free-run and light press juice with minimal skin contact.

Cold soak: Not typically used for white wines (unlike reds). A brief (2–4 hour) cold settling after pressing to drop coarse lees is common.

Juice settling (débourbage): Allow settled juice to rest for 24–48 hours at 10–12°C to drop fine particles. Rack off the lees and ferment clean juice. Alternatively, fine lees contact during fermentation (without settling) builds more yeast autolytic character.

MLF Decision: The Single Most Consequential Choice

Whether or not you encourage MLF in Chardonnay determines the fundamental character of the wine.

MLF encouraged (Meursault, California style)

• Malic acid → lactic acid reduces sharpness
• Diacetyl production: buttery, creamy character
• Lower perceived acidity, rounder mouthfeel
• Risk: can make wine flabby if natural acidity is already low
• Add Oenococcus oeni (VP41, CH11) immediately after primary fermentation in warm conditions (18–22°C, SO₂ below 10 mg/L)

MLF prevented (Chablis, modern fresh-style Chardonnay)

• Preserves crisp malic acidity
• Retains citrus, green apple, fresh fruit characters
• More structure and ageability in acidic styles
• Add SO₂ (25–30 mg/L free) immediately after primary fermentation to inhibit LAB; keep temperature low

If your Chardonnay is naturally low in acid (pH above 3.5), you likely want to prevent MLF and add tartaric acid at crush.

Oak: The Defining Stylistic Choice

Barrel fermentation (classic Burgundy method)

Juice is fermented in oak barrels rather than inert tanks. This:

• Integrates oak flavours gradually during fermentation
• Allows yeast lees (fine lees) to contact oak and build complexity
• Produces the most seamless, complex Chardonnay
• Expensive: 225L barrique costs £400–900+

Barrel ageing after tank fermentation

Ferment in stainless, age in oak. Less complex than barrel-fermented but more controllable.

Oak alternatives (home winemaker)

• Oak spirals (French medium toast): submerge 1–2 per 20L for 4–8 weeks
• Oak cubes or chips: faster but can taste "chippy"
• Stave inserts in tank: slower, more like barrel ageing

Completely unoaked

100% stainless steel. Focus entirely on fruit expression, acidity, and terroir. Ideal for Chablis-style or when the fruit character is the main attraction.

Lees Stirring (Bâtonnage)

Stirring fine lees in barrel or tank is one of Burgundy's signature techniques:

• Releases mannoprotein compounds from dead yeast cells
• Builds texture, creamy mouthfeel, and complexity
• Protects wine from oxidation (yeast cell walls consume oxygen)
• Typically done weekly for 6–12 months

For home winemakers: A simple stainless rod to stir from the bottom works fine. Sanitise thoroughly each time.

Fining and Clarification

• Bentonite: for protein stability (heat stability test recommended before bottling)
• PVPP: for browning/oxidation prevention
• Avoid heavy fining of barrel-fermented Chardonnay — you strip the very texture you worked to build

Run a heat stability test: heat a 10mL sample at 80°C for 30 minutes, cool, and observe. If a haze forms, bentonite fining is needed.

Style Decision Tree

High acid fruit + early pick? 
  → Prevent MLF → No oak → Chablis style

Moderate fruit + mid-season pick?
  → MLF encouraged → Moderate oak → Classic Burgundy

Low acid fruit + late pick?
  → Acidify before ferment → MLF optional → Oak to taste