How long to cook celeriac: 12–15 min boiled, 15–20 min steamed, 35–45 min in the oven at 200°C (180°C fan) and 15–20 min in an air fryer at 200°C. Every way to cook it is below, with the temperature and how to tell it’s done.
How long to cook celeriac
Times are for 1 medium celeriac (about 750 g), for 4.
Cut off the knobbly skin with a knife and cut into 2–3 cm cubes. It browns once cut, so drop it into water with a squeeze of lemon.
How to tell it’s done
A knife slides in easily.
Questions
How long to boil celeriac?
12–15 min simmering in salted water. For mash, often with potatoes.
How long to steam celeriac?
15–20 min over simmering water.
How long to cook celeriac in the oven?
35–45 min at 200°C (180°C fan), 400°F, gas 6. Toss in oil and turn halfway.
How long to cook celeriac in an air fryer?
15–20 min at 200°C (400°F). Toss in a tablespoon of oil; shake halfway.
Times are a guide for typical home portions: ovens, air fryers, microwaves and the size of what you’re cooking all vary. Check meat, poultry and fish with a thermometer before serving. Safe temperatures follow USDA and UK Food Standards Agency guidance, last checked 11 November 2026.