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three glass jars full of whole grains the first labeled oat flour

How to Make Oat Flour

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  • Author: Lindsay Cotter
  • Total Time: 5 minutes
  • Yield: 1 cup oat flour 1x
  • Diet: Gluten Free


Learn how to make oat flour for all your gluten free baking needs! All you’ll need are gluten free oats, a blender, and a couple of minutes!


Units Scale
  • 23 cups gluten free oats (rolled, quick, or steel cut)


  1. Place 1-2 cups oats in a high-speed blender or food processor at a time.
  2. Blend or pulse for around 45 seconds or until a fine flour-like consistency is formed. NOTE –  Steel cut oats may take longer to blend. Begin by blending the oats for 45 seconds, scrape sides, and repeat for a total of 90 seconds to 2 minutes or until a fine flour is formed. Transfer the ground oats to a glass jar or bowl.
  3. Repeat with the remaining oats. 
  4. Store at room temperature for 2-3 months. Or freeze up to 6 months.


Storage Tip – Whole grain gluten free flours contain natural oils. So, the shelf life is not as long as that of refined flours.  

Measuring Tip – In most cases, 1 ¼ cups of gluten free rolled oats makes around 1 cup of oat flour.

  • Prep Time: 2 minutes
  • Cook Time: n/a
  • Category: Baking
  • Method: Blend
  • Cuisine: American