Short Answer:

Yes, preheating the air fryer for vegetables is recommended. Preheating ensures that the appliance reaches the proper cooking temperature, which helps the vegetables cook evenly and develop a crisp exterior.

Without preheating, vegetables may cook unevenly, become soggy, or take longer to achieve the desired texture. A few minutes of preheating improves airflow and heat distribution, resulting in tender, flavorful, and nicely roasted or air-fried vegetables.

Detailed Explanation:

Preheating the Air Fryer for Vegetables

Preheating the air fryer is an important step that prepares the appliance for optimal cooking. Air fryers circulate hot air rapidly to cook food evenly, and starting with a preheated unit ensures that the vegetables begin cooking immediately at the correct temperature. This prevents uneven cooking where some pieces are overcooked while others remain undercooked. Preheating is particularly helpful for vegetables with high water content, like zucchini, peppers, or okra, which can become soggy if the air fryer starts cold.

Effects on Texture and Crispiness
Preheating helps achieve a crisp exterior on vegetables. When the air fryer is already hot, the surface of the vegetables begins to caramelize immediately, forming a lightly browned and slightly crispy layer. Without preheating, the initial cooking is slower, allowing moisture to release before browning occurs, which can result in a softer, less appealing texture. Vegetables like broccoli, cauliflower, or potatoes benefit from preheating because it enhances their natural flavors while producing a satisfying texture contrast between the crispy exterior and tender interior.

Cooking Time Considerations
Preheating reduces overall cooking time. Starting with a hot air fryer allows the vegetables to reach the desired texture faster, which also helps retain nutrients that might degrade during prolonged cooking. For most vegetables, preheating for 2–5 minutes at the desired cooking temperature is sufficient. This short preheating period ensures the appliance is ready for even, efficient cooking without overextending cooking times.

Best Practices for Preheating
Place the empty air fryer basket inside and run the appliance at the target temperature for a few minutes before adding the vegetables. This creates an evenly heated environment, reducing hot or cold spots. Once preheated, arrange the vegetables in a single layer, avoid overcrowding, and shake or turn them halfway through cooking. Proper airflow during preheating and cooking ensures golden, crisp edges while keeping the interior tender.

Conclusion

Preheating the air fryer for vegetables is recommended to ensure even cooking, crispiness, and optimal texture. It reduces cooking time, prevents sogginess, and enhances caramelization and flavor. Preheating for a few minutes at the target temperature before adding the vegetables sets the stage for perfectly cooked, tender, and flavorful air-fried or roasted vegetables every time.