Bake better sourdough.
One month at a time.
In-depth sourdough guides, troubleshooting, and the free Hydration Handbook for bakers who want to understand the craft — not just follow a recipe. Join 30 days of Sourdough September, or jump straight to the latest guide.
Fresh from the oven
Guides, recipes, and tools for sourdough bakers who want the why, not just the how.
The Crumb Lab is a small editorial site for home sourdough bakers. Our work falls into three buckets: in-depth guides that explain how fermentation, hydration, and shaping actually work; tested recipes for breads, bagels, focaccia, and discard baked goods; and a free calculator that designs flour blends and auto-generates baking schedules around your kitchen temperature.
We focus on artisan techniques — high-hydration doughs, long cold proofs, heritage grains, and natural leavens — because they reward the kind of baker who wants to develop an intuition for the craft, not just turn out a loaf. The Sourdough September series is a 30-day guided practice if you want a starting point.
Every post that makes an empirical claim cites a primary source. When a widely-repeated claim doesn't have one, we flag that in the post's footer so you can weigh the evidence yourself. We don't collect personal data, run newsletter signups, or use tracking cookies beyond what Google AdSense requires to serve ads — see the privacy policy for details. The team behind the site is described on the about page.
From the archive
-
The 70% Hydration Country Loaf: Week 1 of Sourdough September
A 5,500-word deep-dive on the science and technique behind the first bake of our 30-day series.
-
Sourdough September: Your 30-Day Plan for Better Bread
A month of guided practice: five loaves, four technique deep-dives, two community rituals, and a final showcase.
-
Sourdough for Beginners: The Foolproof First Loaf
A complete walkthrough for first-time bakers: starter, mix, fold, shape, proof, bake.
-
The Science of Sourdough Sourness: Lactic vs Acetic Acid Explained
What makes a loaf tangy, what makes it sharp, and how to dial the flavor profile you want.
-
Cold Proof Deep Dive: Why Overnight Refrigeration Changes Everything
The chemistry, the timing, and the technique that turns a good loaf into a great one.
-
Baking Sourdough with Single-Origin and Heritage Grains
Why flour terroir matters, where to source, and how to adjust hydration for ancient varieties.