How long do I really need to cool a sourdough loaf before slicing?

Minimum one hour for a 500 g boule, two to four hours if you want the full crumb to set. The internal temperature has to drop below 50°C for **starch retrogradation** to finish. Slice earlier than that and you'll see the cut surface go pasty under the knife. The crust also keeps releasing steam for 30–60 minutes after the bake — opening it early traps that moisture inside and softens both crumb and crust.

Why does my crust go soft a few hours after cooling?

Steam escaping the crumb has nowhere to go and ends up condensing on the crust from the inside. A wire rack helps because air circulates underneath; a flat surface seals the bottom and turns it leathery. Keep the cooled loaf upright in a paper or linen bag — never plastic for the first day. If the crust does soften, three minutes in a 200°C oven will crisp it right back.

Can I cool sourdough faster in the fridge or freezer?

You can, but you'll pay for it. Fast cooling locks the starch into a firmer, less elastic crystal structure, so the crumb feels drier the next day even if it isn't. The freezer is fine for long-term storage once the loaf has cooled to room temperature on the counter, but skip the shortcut on a fresh bake. The first 60 minutes on a wire rack are not optional.

Is the loud crackling sound after the bake a good sign?

Yes — bakers call it the *singing* or *song* of the bread. As the crust cools and shrinks faster than the crumb beneath it, micro-cracks open across the surface and the gelatinized starch layer crackles audibly. A loaf that sings has a properly developed crust and a well-hydrated interior. A silent loaf usually means underbake or too low a hydration.

Why does day-old sourdough taste sweeter and milder?

As the loaf finishes cooling and rests for a few hours, the lactic and acetic acids redistribute through the crumb and round out, while the starch crystallization releases bound aromatic compounds. The dough also loses some volatile acidity to the air. Many bakers — Forkish among them — argue sourdough actually peaks 12–18 hours after baking. The hot loaf is exciting; the cool loaf is honest.

Cooling Sourdough: the Final Hour That Decides Crumb