At some point in your pizza journey, you stop blaming your oven and start blaming your dough. Then you start blaming your fermentation. Then — if you go deep enough down the rabbit hole — you end up at 11pm with flour in your hair, reading an Italian bread forum and wondering whether you should be making a biga or a poolish. Welcome. You’re in good company.

Both are pre-ferments — mixtures of flour, water, and a tiny amount of yeast that ferment before being added to your final dough. Both improve flavor, texture, and shelf life. But they’re built differently, they behave differently in your hands, and they produce noticeably different crusts. This guide cuts through the confusion and gives you a straight answer on which one to use — for your skill level, your schedule, and your pizza style.

What Is a Pre-Ferment (and Why Bother)?

A pre-ferment is exactly what it sounds like: a portion of your dough’s flour and water that you mix ahead of time and let ferment before it joins the rest of the ingredients. Think of it as giving your dough a head start — one that pays off in flavor, structure, and digestibility.

When flour and water sit together with a tiny amount of yeast for several hours, something interesting happens. Enzymes begin breaking down starches and proteins. Organic acids build up. Carbon dioxide accumulates. By the time you fold this pre-fermented mass into your final dough, you’re starting with ingredients that are already halfway to delicious. The result is a crust with noticeably more complexity than you’d get from a same-day mix.

According to King Arthur Baking, pre-ferments also improve dough extensibility, gluten development, and the overall keeping quality of the final bake — meaning your leftover slices stay better longer. (Yes, I know. “Leftover pizza” is a bold concept in this house too.)

There are several types of pre-ferment — sourdough levain, pâte fermentée, sponge — but the two that dominate the pizza world are biga and poolish. They’re both made with commercial yeast, both ferment in a single session (no ongoing starter maintenance required), and both can transform your crust in a way that’s immediately obvious the first time you use one.

What Is Biga?

Biga is an Italian pre-ferment with a long track record in traditional Italian bread — ciabatta, focaccia, and Neapolitan pizza dough all use it. The defining characteristic of biga is its low hydration: typically around 50–60% water relative to flour. That makes it stiff. Not quite kneadable-dough stiff, but definitely not pourable. Think shaggy, rough, and a little stubborn.

To make a biga, you combine flour, water, and a very small amount of yeast — usually as little as 0.2–0.5% of the flour weight — then mix just until combined. No need to knead it smooth. Cover it and let it ferment at room temperature for anywhere from 12 to 18 hours, then refrigerate if you’re not using it right away.

The stiffness of biga has a practical consequence: it ferments more slowly, which means more time for complex flavors to develop. The lower hydration also concentrates the fermentation byproducts — acids, alcohols, CO₂ — which translates to a more pronounced flavor in the finished crust. Many pizzerias that make Neapolitan or Roman-style pizza use biga precisely for this reason. It builds depth that you can taste.

The downside? Biga is less forgiving to work with. Because it’s stiff, incorporating it into the final dough takes more effort — you’ll be breaking it up by hand into chunks and mixing it into the remaining ingredients, which can feel awkward until you’ve done it a few times. It’s also more sensitive to temperature: biga ferments faster in a warm kitchen and slower in a cool one, which matters when you’re trying to hit your pizza night deadline.

That said, biga can be refrigerated for 3–5 days after it peaks, making it a useful thing to batch ahead if you’re planning multiple bakes in a week. (Or if you just made too much and need to justify opening another bottle of wine while you figure out what to do with it.)

What Is Poolish?

Poolish has a slightly confusing origin story. The name suggests it’s Polish, and it probably is — Polish bakers are widely credited with developing the technique in the 19th century. But it was French bakers who adopted and refined it, and today poolish is most closely associated with French bread traditions, particularly the baguette. Italian pizzaioli tend to prefer biga, while North American professional pizza makers have embraced poolish enthusiastically, according to Ooni’s guide to pre-ferments.

The key difference from biga is hydration. Poolish uses equal parts flour and water by weight — that’s 100% hydration — which makes it a loose, pourable, batter-like mixture. It looks almost like pancake batter after mixing. You add a small pinch of yeast, stir it together, cover it, and let it ferment for 8–16 hours at room temperature.

Because it’s so wet, poolish is significantly easier to incorporate into your final dough — you just pour it in and mix. The high hydration also means it ferments relatively quickly (compared to biga), which is both an advantage and a limitation. You get a faster turnaround, but the window between “ready” and “over-fermented” is shorter. After poolish peaks and starts to collapse, you’ve typically got about 8 hours before it degrades, per guidance from Fond Kitchen’s detailed poolish breakdown.

The flavor poolish delivers is described as subtly sweet, buttery, and gently complex — fermented notes that enhance the flour without overpowering it. It’s more approachable than biga’s deeper, more assertive tang. And the dough it produces is highly extensible, which means it stretches beautifully without fighting back.

Biga vs Poolish: Head-to-Head Comparison

Flavor Differences: What Your Crust Will Actually Taste Like

This is the part that matters most when you’re eating the pizza, so let’s be specific.

Biga: Deep, Complex, with a Wheaty Backbone

Because biga ferments slowly at lower hydration, the balance of microbial activity tips toward lactic and acetic acid production. The result is a crust with more tang — not sourdough-level sour, but a noticeable depth that makes the crust taste like something, even without toppings. There’s a wheaty, slightly nutty quality that comes through clearly. Many people describe it as tasting more “authentic” or “artisan” — which is chef-speak for “you can taste the process.”

If you’ve ever had a proper Neapolitan pizza at a serious pizzeria and thought “why does this taste so much better than mine,” biga fermentation is probably part of the answer. It’s the kind of flavor complexity you simply can’t get from a same-day dough.

Poolish: Mild, Sweet, and Flour-Forward

Poolish produces what Ken Forkish calls “buttery and nutty notes” in the dough — subtle fermented complexity that complements the flour rather than competing with it. The flavor is gentler and more universally appealing, especially for people who prefer their toppings to be the star of the show. If you’re loading up a pizza with assertive flavors — pesto, buffalo chicken, bold sauces — poolish-based dough works beautifully because it doesn’t add its own strong opinion.

It’s also worth noting that the milder flavor profile makes poolish more approachable for first-timers. You can taste the improvement over a basic dough, but it’s not overwhelming.

Texture and Crumb: What Comes Out of the Oven

Flavor gets you interested; texture is what keeps you coming back.

Biga Gives You Chew and Structure

Biga-based doughs tend to produce a crust with a pronounced chew — the kind of satisfying resistance that makes each bite feel substantial. The oven spring is strong, so the cornicione (that puffy edge ring) gets taller and more dramatic. The crumb inside is open but not as irregular as poolish — more like controlled bubbles than wild holes. This is the texture you want for a proper New York-style or Neapolitan slice — something that holds up, folds cleanly, and has presence.

Poolish Gives You Lightness and Irregular Open Crumb

If you’ve ever seen a pizza cross-section with those beautiful large, irregular holes in the cornicione and thought “I want that,” poolish is your path there. The high-hydration ferment develops gluten in a way that produces a lighter, airier crumb. The crust has a more tender bite — less chew, more delicacy. It’s not weak or flimsy; it’s the difference between a well-baked baguette and a chewy bread roll. Both are excellent. Neither is wrong. But they’re very different eating experiences.

Poolish dough also tends to spread slightly more during baking, which can actually help if you’re working toward a thin, crispy base. It’s a popular choice for thin-crust styles for exactly this reason.

Which One Should You Use?

Here’s the straightforward answer: start with poolish if you’re new to pre-ferments, move to biga when you want more depth. But the real decision depends on three things — your pizza style, your timeline, and your current skill level.

It’s also worth noting that many advanced home bakers eventually try using both simultaneously — adding 15–20% biga and 15–20% poolish to the same final dough. According to Fond Kitchen’s comprehensive pre-ferment guide, this hybrid approach can capture the chew and wheaty depth of biga alongside the extensibility and lighter crumb of poolish. Ambitious? Yes. Worth it? Absolutely — once you’ve nailed each individually.

For more on how your flour choice interacts with pre-ferment technique, see our guide on bread flour vs 00 flour for pizza. The two decisions are closely related.

Basic Ratios and How to Make Each One

You don’t need precision scales to get started (though they help enormously). These are the foundational ratios — adjust quantities to match your total dough recipe, keeping in mind that your pre-ferment should represent 20–50% of the total flour in the recipe.

A few key rules for both: Always use cold water — this slows the fermentation and drives the development of more complex, deeper flavors. Use a clear glass or plastic container so you can monitor the bubble structure without disturbing it. And subtract the flour and water used in your pre-ferment from the total amounts in your final dough recipe — it’s not additional flour, it’s a portion of the total.

For how to properly apply these doughs in your oven, check our guide on best oven settings for pizza at home — pre-ferment doughs often benefit from slightly different temperature approaches than basic same-day doughs.

The Tiga: The Hybrid Nobody Talks About

If biga is Italy and poolish is France, the tiga is where they meet for a glass of wine and decide they actually like each other.

A tiga is a modified biga run at approximately 70% hydration — wetter than a classic biga (50–60%) but thicker than a poolish (100%). It gives you some of the chew and wheaty depth of biga alongside the extensibility and lighter crumb of poolish. Some competition-level pizza makers swear by this hybrid approach because it lets them dial in the balance they want without maintaining two separate starters simultaneously.

To make a tiga: use the same method as biga, but increase your water to 70g per 100g of flour. Same tiny amount of yeast, same 12–16 hour ferment at room temperature. The consistency will be somewhere between biga and poolish — manageable by hand but not as dry as classic biga. If you’ve already made both and you’re looking for something in the middle, tiga is worth an afternoon of experimentation.

For more advanced dough technique — including how fermentation interacts with cold proofing — see our in-depth guide to cold fermentation pizza dough.

The Verdict

Biga and poolish are both legitimate upgrades to your pizza dough — neither is better in an absolute sense. Biga wins on flavor depth and chew; poolish wins on ease, extensibility, and open crumb. The right choice comes down to what you’re making and where you are in your pizza-making journey.

Start with poolish. Make it a few times, get comfortable with the process, and notice what it does to your crust. Then try biga. By the time you’ve baked with both, you’ll have a gut-level understanding of how pre-ferments work — and when to reach for which one.

And if you want to go deeper on the fundamentals, our ultimate pizza dough guide covers everything from flour selection to shaping to final proof. It’s the companion piece to everything you’ve just read here.

Now go mix something. Your oven’s not going to preheat itself. (Though if yours does, please let me know. I have questions.)