What are the Ingredients in Kirkland Signature Oats?

December 2, 2025 •

3 min read

Over 70% of people in a recent survey reported eating oatmeal for breakfast at least once a week, making it a popular pantry staple. If you've ever wondered about the ingredients in Kirkland Signature oats from Costco, the answer varies depending on the specific product, ranging from a simple single-ingredient item to a complex blend of ancient grains and other additions.

Quick Summary

The specific ingredients in Kirkland Signature oats depend on the product, such as the simple whole grain rolled oats or the more complex ancient grain granola which includes sugar, nuts, and additional grains.

Key Points

Single Ingredient Rolled Oats: Kirkland Signature's Whole Grain Rolled Oats contain just one ingredient: 100% whole grain rolled oats.
Complex Granola Ingredients: The Ancient Grain Granola includes multiple ingredients like rolled oats, ancient grains (spelt, quinoa), nuts (almonds), sugar, and natural flavors.
Product Variety: Kirkland Signature offers different oat products, including simple rolled oats for cooking and ready-to-eat granola with extra ingredients.
Added Sugars: The Ancient Grain Granola contains added sweeteners like cane sugar and molasses, while the rolled oats have no added sugar.
Allergen Awareness: The rolled oats may have cross-contamination risk, while the granola explicitly contains soy, wheat, and almonds.
Probiotics: Some versions of the Organic Ancient Grain Granola include probiotics for gut health, an ingredient not found in the plain rolled oats.
Versatile Uses: Rolled oats are perfect for cooking, baking, and overnight oats, whereas granola is ideal for quick snacking or topping yogurt.

What are the ingredients in Kirkland Signature Whole Grain Rolled Oats?

Kirkland Signature's Whole Grain Rolled Oats are known for their simplicity, featuring just one ingredient: 100% whole grain rolled oats. This makes them a minimally processed and highly versatile pantry staple. They are free from additives, preservatives, and added sugars, making them a pure and natural option for a variety of meals. The simple ingredient list is one of the main reasons many health-conscious consumers choose this product.

Are Kirkland Signature Rolled Oats Organic?

Costco's Kirkland Signature offers both organic and conventional rolled oats. The Organic Whole Grain Rolled Oats will specifically list 'organic whole grain rolled oats' as the sole ingredient. If the label does not specify 'organic,' you can assume they are conventionally grown. It's always best to check the packaging to ensure you are purchasing the type that aligns with your preferences.

What are the ingredients in Kirkland Signature Organic Ancient Grain Granola?

In contrast to the simple rolled oats, the Kirkland Signature Organic Ancient Grain Granola contains a more extensive list of ingredients. This product is a blend of various whole grains, nuts, and sweeteners, providing a more complex flavor and texture profile. The ingredients include:

Organic Rolled Oats: The base of the granola, providing fiber and texture.
Unrefined Cane Sugar: A sweetener used in the granola blend.
Soy Oil: Used to bind the ingredients and create a crispy texture.
Ancient Grains: Rolled spelt, KAMUT khorasan wheat, rolled quinoa, and rolled amaranth are included for added nutritional benefits and flavor.
Almonds: A source of healthy fats and protein.
Inulin: A prebiotic fiber.
Rice Starch: A binding and texturizing agent.
Sea Salt: Enhances the overall flavor.
Molasses: Adds a deeper, caramelized sweetness.
Cinnamon and Natural Vanilla Flavor: Provides warm and sweet notes.
Tocopherols (Vitamin E): Added as a natural preservative to enhance freshness.
Probiotics (Bacillus coagulans GBI-30 6086): Some versions of this granola also contain probiotics for digestive health.

Comparison: Rolled Oats vs. Ancient Grain Granola

To help you decide which Kirkland Signature oat product is right for you, here is a comparison table outlining the key differences.


Feature	Kirkland Signature Whole Grain Rolled Oats	Kirkland Signature Organic Ancient Grain Granola
Ingredients	Single ingredient: 100% Whole Grain Rolled Oats.	Multiple ingredients: Oats, cane sugar, soy oil, various ancient grains, almonds, and more.
Sweeteners	None.	Cane sugar and molasses.
Additives	None.	May contain probiotics, tocopherols (Vitamin E), and natural flavors.
Allergens	Processed in a facility that may contain gluten.	Contains soy, almonds, and wheat; may contain peanuts and other tree nuts.
Preparation	Requires cooking with water or milk (stovetop or microwave).	Ready-to-eat; can be enjoyed with milk or as a topping.
Texture	Soft and creamy when cooked.	Crunchy and nutty.
Best for...	Classic oatmeal, overnight oats, baking recipes that require soft oats.	Quick breakfast, topping yogurt or smoothies, snacking.

Cooking and Serving Suggestions

The simplicity of Kirkland Signature's Whole Grain Rolled Oats makes them incredibly versatile. You can make a traditional bowl of oatmeal by combining a half cup of oats with a cup of boiling water and simmering for 5-10 minutes. To enhance flavor without added sugar, top your oatmeal with fresh fruit like berries or bananas, nuts, and a sprinkle of cinnamon. They also work perfectly for overnight oats, providing a convenient and healthy grab-and-go breakfast. Simply soak the oats in your favorite milk or yogurt overnight.

For baking, rolled oats can add a chewy texture to cookies, muffins, and homemade granola bars. The bulk size of the Kirkland Signature bag makes it an economical choice for frequent bakers. Alternatively, the Ancient Grain Granola can be enjoyed straight from the bag with milk or used as a crunchy topping for yogurt parfaits. This is a great option when you need a quick, no-fuss breakfast or snack that still delivers on flavor and nutrients.

Conclusion

Understanding what are the ingredients in Kirkland Signature oats is crucial for making an informed choice for your diet. For those seeking a pure, single-ingredient whole grain product, the Whole Grain Rolled Oats are the ideal choice. If you prefer a ready-to-eat breakfast cereal with more complex flavors and additional grains, the Organic Ancient Grain Granola provides a delicious and convenient alternative. By checking the label and considering your dietary needs and taste preferences, you can easily find the Kirkland oat product that best fits your lifestyle. For more information on food and diet, consider consulting a reliable resource like the National Institutes of Health.

Frequently Asked Questions

Kirkland Signature Whole Grain Rolled Oats are not certified gluten-free because they are processed in facilities that also handle gluten-containing grains, which poses a risk of cross-contamination. For those with celiac disease or gluten sensitivity, it is essential to purchase products specifically labeled and certified as gluten-free.

Kirkland Signature's rolled oats are whole oat groats that have been steamed and flattened, requiring a longer cooking time for a chewier texture. Instant oatmeal is more processed, pre-cooked, and rolled thinner, resulting in a faster cooking time and a softer texture.

The Kirkland Signature Whole Grain Rolled Oats contain no added sugar. However, the Kirkland Signature Organic Ancient Grain Granola does include added sweeteners like cane sugar and molasses.

Yes, Kirkland Signature offers an Organic Whole Grain Rolled Oats product that lists 'organic whole grain rolled oats' as its sole ingredient. Always check the specific product label to confirm if you are buying the organic version.

The ancient grains found in the Kirkland Signature Organic Ancient Grain Granola typically include rolled spelt, KAMUT khorasan wheat, rolled quinoa, and rolled amaranth. These grains are added to enhance the product's flavor, texture, and nutritional profile.

Yes, Kirkland Signature Whole Grain Rolled Oats are an excellent choice for making overnight oats. The rolled oats absorb liquid well overnight, resulting in a creamy and satisfying breakfast.

For maximum freshness and to prevent spoilage, it is best to store Kirkland Signature oats in an airtight container in a cool, dry place. The large bulk bags from Costco should be transferred to a storage container after opening.