How to know curing is finished

You've reached the last day on the schedule and you're itching to cook. Is the oven ready? Two checks can help: have you finished the maker's schedule, and does the dome look dry? Your own manual's end-of-cure instructions come first, and if you're unsure, ask the maker.

Check 1: the schedule is done

Start with the paperwork. One maker's curing runs slowly over a 5 day period, ending with a fifth day at 500°F (260°C)¹. That's one maker's plan for its own oven. Yours may be shorter or longer, so count against your manual.

As a general caution, if you skipped a day, repeated a day or had a rainy break in the middle, you may be unsure whether the cure is complete. Follow your own manual's end-of-cure instructions, and ask the maker if unsure.

Check 2: the dome tells you

One guide, a builder's blog about a clay and firebrick oven rather than a maker's manual, says you can tell when the oven is fully cured just by looking². A finished cure, it says, leaves a dome that looks clean and white hot, with no soot or visible moisture².

That guide describes a re-cure of an older oven. The white spreads at the top and comes up the sides from the floor. A strip of black along the walls of the vault means the cure isn't finished².

Remember that this is a builder's description of one clay and firebrick oven, not a promise for your model. A different material may look different. If your manual describes its own end sign, trust that.

Signs it isn't finished

• A significant strip of black along the walls of the vault².
• The inside feels cool and damp once it's cold².
• You've used only part of the schedule.

Dark patches can have other causes, so read the soot and damp page before you decide. If the dark areas come back after a full schedule, write to the maker.

The last step: more heat

Some guides want the oven to go hotter than the schedule's last day. The builder's blog says that to finish the cure you move the temperature steadily up from 400°F to 1,000°F². That advice is about one clay and firebrick oven, not a maker's manual. Another maker says that after curing, the oven will reach higher temperatures than before it was cured¹.

Those are different makers with different designs. Don't push your oven to a number from this page. Follow the final stage in your own manual, and if it has none, ask. One clay oven maker simply advises heating up progressively so any humidity disappears before use³.

Cooking the first pizza

One guide advises taking the oven through a complete cure cycle before cooking². After that, your manual's cooking instructions apply. Keep the fire outdoors every time, as explained in Curing outdoors only: carbon monoxide and fire safety.

A fine crack or two doesn't mean curing failed. Hairline cracks in a new oven: what they usually mean goes through which ones to ask about.