Blanched almond flour is made from almonds that have had their brown skins removed before being ground into a fine powder. The word “blanched” refers specifically to this skin-removal step, not to any cooking or roasting process. The result is a pale, smooth flour with a finer texture than almond flour made from whole, skin-on almonds.
How Almonds Are Blanched
Blanching is simple: almonds are briefly exposed to boiling water or steam, which loosens the thin brown skin so it slips right off. At home, this means dropping almonds into boiling water for 15 to 30 seconds, then pinching each one so the nut pops out of its skin. Commercially, processors use high-pressure steam and mechanical agitation to strip the skins from large batches in seconds. Once the skins are removed, the pale almonds are dried and ground into flour.
Blanched vs. Unblanched Almond Flour
If a bag of almond flour doesn’t say “blanched,” it’s likely unblanched, meaning the skins were left on before grinding. The differences between the two are mostly visual and textural, but they can matter depending on what you’re making.
Blanched almond flour is lighter in color and has a finer, more uniform texture. It works well in delicate pastries, cakes, cookies, and anything where you want a smooth crumb and a clean appearance. Unblanched almond flour has a speckled, slightly darker look from the ground-up skin fragments, and it tends to produce denser baked goods. Flavor-wise, the difference is subtle. Unblanched flour can taste slightly more “nutty” because of the skins, but most people won’t notice in a finished recipe.
For macarons, light-colored cakes, or anything where presentation matters, blanched is the better choice. For heartier baked goods like muffins, pancakes, or pie crusts, unblanched works fine.
Why Removing the Skins Matters
Beyond appearance, removing the skins has a nutritional angle. Almond skins contain phytates (sometimes called phytic acid), compounds that can reduce your body’s ability to absorb minerals like iron, zinc, and calcium. For most people eating a varied diet, this isn’t a major concern. But if you have a mineral deficiency or rely heavily on plant-based sources of iron and zinc, blanched almond flour may offer a slight absorption advantage.
The skins also contain most of the almond’s polyphenols, which are antioxidant compounds. So there’s a trade-off: blanching improves mineral availability but removes most of those antioxidants. Neither version is nutritionally “better” in an absolute sense. It depends on your priorities.
Substituting for Regular Flour
Blanched almond flour isn’t a one-to-one swap for all-purpose wheat flour. It’s heavier in fat, lower in starch, and contains no gluten, which means it behaves differently in recipes. King Arthur Baking recommends replacing no more than 25% of the flour in non-yeast recipes (cookies, muffins, cakes, scones) with almond flour. For yeast-based doughs like bread or pizza, you can add up to one-third cup of almond flour per cup of wheat flour without losing too much structure.
One useful detail: almond flour weighs less per cup than all-purpose flour. A cup of almond flour weighs about 3.6 ounces, compared to 4.25 ounces for all-purpose. If you substitute by volume, you’re actually adding less flour by weight. Substituting by weight gives you a slightly higher volume of almond flour, which adds more almond flavor and moisture. Either approach works, but it’s worth knowing the difference.
Recipes designed specifically for almond flour (common in gluten-free, keto, and paleo baking) already account for these differences and typically call for extra eggs or other binders to compensate for the lack of gluten.
Storage and Shelf Life
Almond flour has a much higher fat content than wheat flour, which makes it prone to going rancid. How you store it determines how long it lasts. In a sealed container in a cool, dark pantry, blanched almond flour keeps for about 6 months. In the refrigerator, it lasts up to a year. In the freezer, properly sealed, it can last up to two years.
Airtight storage is essential regardless of location. Exposure to air, heat, light, or moisture all accelerate spoilage. If your almond flour smells bitter, sour, or like old paint, it’s gone rancid and should be tossed. Rancid flour won’t make you sick in small amounts, but it will ruin the flavor of anything you bake with it.