How To Make The Best French Fries In Air Fryer

You’ve probably pulled a basket of pale, limp fries out of your air fryer and wondered what went wrong. The internet is full of promises, but soggy results are the real default. The gap between mediocre and golden, crunchy fries comes down to a handful of physical details — water, oil, heat, and timing.

This guide walks through the exact steps that reliable recipe testers (Serious Eats, America’s Test Kitchen, Simply Recipes) agree on. No gimmicks, no special gadgets. Just the prep work and temperature choices that consistently produce some of the crispiest fries your air fryer can turn out.

The Key Steps for Crispy Air Fryer Fries

Crispy french fries from an air fryer are absolutely possible, but the machine works differently than a deep fryer. The circulating hot air needs help reaching every surface. That means you control the moisture, the oil coating, and the spacing.

Start with russet potatoes. Their high starch and low moisture content give you a fluffy interior and a surface that crisps well. Cut them into uniform strips about ¼ to ½ inch thick — a mandoline slicer helps if you want consistent results.

Soak those strips in cold water for at least 30 minutes (up to overnight works too). This step removes excess surface starch, which is the main reason fries stick together and turn out gummy rather than crunchy.

Why Soaking and Drying Matter

Most people skip the soak and go straight to oil and heat. That’s the most common reason air fryer fries fail. The starch left on the surface turns into a paste when heated, gluing the fries together and blocking airflow.

• Soak in cold water: Even a 30-minute soak changes the texture noticeably. The water pulls starch out of the cut surfaces, giving the oil somewhere to go later.
• Dry thoroughly: After soaking, pat the strips bone-dry with a clean kitchen towel or paper towels. Any leftover water creates steam inside the basket, which steams the fries instead of crisping them.
• Single layer in the basket: Overcrowding drops the temperature and traps steam. Arrange the strips so they aren’t touching or overlapping.
• Spray the basket first: A quick coat of cooking spray on the basket helps the fries release easily and promotes even browning.
• Shake halfway through: Tossing or shaking the basket once during cooking ensures every side gets even heat exposure.

These steps sound small, but they address the physics of hot-air cooking directly. Skip one, and the fries will be noticeably less crisp.

Choosing the Right Temperature and Time

You can go with a single cooking temperature or a two-stage method. Both work, but the two-stage approach gives you a little more control over the interior texture. The key is to preheat the air fryer first — a cold start will cost you crispness.

For a single-temperature cook, preheat the air fryer to 375°F (190°C). Cook the fries for 15 to 25 minutes, shaking the basket every 5 minutes. Serious Eats recommends this approach in its guide to soak potatoes for crispy fries alongside the drying routine — the combination is what delivers consistent results.

For a two-stage method (preferred by America’s Test Kitchen), start at 350°F (175°C) for 15 to 20 minutes as a “parcook.” Then crank the heat to 400°F (200°C) for the last 5 to 10 minutes to finish browning. This gives you a fully cooked, tender inside and a very crunchy outside.

Frozen Fries Are Different

If you’re using frozen fries, skip the soaking step. Cook them directly from frozen, toss with a little oil, and run the air fryer at 400°F (200°C) for 10 to 15 minutes, shaking halfway. The coating on most frozen fries is already designed to crisp.

Notice the variation in cook times across methods. The actual time depends on the thickness of your cut and the specific air fryer model. Check for doneness at the lower end of the range and add time if needed.

Tips for Even Cooking and Seasoning

Even browning inside an air fryer is not automatic. The basket’s shape creates hot spots, and crowded fries block airflow. You can even out the results with a few deliberate moves.

1. Cut uniform strips. Mixing thick and thin pieces guarantees some will burn while others stay undercooked. Aim for ¼ to ½ inch, and try to keep them within the same size range.
2. Preheat every time. Starting with a hot chamber means the fries begin crisping immediately. Without preheating, the first few minutes are just warming up — and that extra time in the basket undermines texture.
3. Shake or toss at least once. Flipping the fries halfway redistributes them in the basket. This prevents the bottom layer from steaming while the top layer browns.
4. Salt after cooking. Salt draws moisture out of the potato surface if applied before cooking. Sprinkle salt right after you pull the basket out, while the oil is still warm enough to help the seasoning stick.

The Secret to Extra Crispiness: Cornstarch and Oil

The amount of oil you use matters more than you might think. Too much, and the fries become greasy and soft. Too little, and the surface dries out without browning. America’s Test Kitchen found that one tablespoon oil is the right amount for a standard batch of homemade fries. Toss the dried strips in oil until they’re lightly coated — no puddles in the bowl.

For an even crunchier exterior, dust the dried potato strips with a small amount of cornstarch before adding the oil. Cornstarch creates a thin, brittle crust that the circulating hot air browns quickly. Serious Eats notes this simple trick can noticeably upgrade the texture of air fryer french fries.

The oil itself doesn’t need to be fancy. Neutral oils like canola, vegetable, or avocado work well because they have a high smoke point and don’t compete with the potato flavor. Olive oil is fine too, but stick to a light or refined version to avoid off flavors at higher temperatures.

The Bottom Line

Making the best french fries in an air fryer comes down to three non-negotiable steps: soak and dry the potatoes, use only about a tablespoon of oil, and cook at the right temperature while shaking halfway. Russet potatoes, a preheated basket, and a single layer in the basket will get you results that rival deep-fried versions with a fraction of the oil.

If your air fryer basket is smaller than 5 quarts, cook in batches rather than piling all the fries in at once — overcrowding is the fastest way to undo all that soaking and drying work. And when you’re ready to try variations, experiment with a light cornstarch dusting or a two-stage temperature method to dial in your preferred level of crunch.