Costco Kirkland Signature Key Lime Cake Review

When I think of key lime, I immediately think of spring and summer. Its sweet, tangy, and refreshing flavor has made it a favorite in desserts like key lime pie, cheesecake, and cake. So when I spotted the Costco Kirkland Signature Key Lime Cake, I couldn’t resist picking one up to enjoy during a hot summer week. I was hoping for a light, refreshing dessert that wasn’t overly sweet and delivered plenty of bright key lime flavor. Read on to find out whether this Costco Key Lime Cake lived up to my expectations.

Location in Store

This can be found in the refrigerated bakery section near the Kirkland Signature Strawberry Scoop Cake and the Kirkland Signature Mini Mousse Variety Pack and the item number is 2057679.

Taste

The Costco Kirkland Signature Key Lime Cake has is simple and tasty, but not the most amazing Costco cake I’ve had. The tart key lime custard, which provides most of the cake’s flavor and adds a refreshing citrusy tang. Although it’s marketed as a key lime cake, I found the filling tasted slightly more like lemon than lime.

The cake itself is moist and light but has the flavor of a basic vanilla cake, while the layer of white icing between the cake layers is fairly plain tasting. The whipped topping has a subtle hint of coconut that pairs nicely with the citrus filling.

At the bottom, there’s a thick graham cracker crust that adds a bit of crunch and classic key lime pie flavor. Overall, this is a tasty, summer dessert that isn’t overly rich or sweet.

Cost

I paid $19.99 Canadian for the Costco Kirkland Signature Key Lime Cake in 2021. As of 2026, Costco sells a similar, but not identical Key Lime Cake for $25.99 Canadian. The price increase may seem like a lot but it’s not surprising given inflation and rising food costs over the past few years.

Convenience

The Costco Kirkland Signature Key Lime Cake has a best-before date of about five days from the day it was packaged and should be kept refrigerated. It’s the perfect dessert for a summer barbecue, birthday celebration, or other warm-weather gathering. We had leftovers, so I froze a slice to enjoy later in the weekend, and it thawed surprisingly well, with the texture and flavor holding up nicely.

Nutrition

Calories

A 1/24 slice of the Costco Kirkland Signature Key Lime Cake contains 270 calories, 14 grams of fat, 31 grams of carbohydrates, 1 gram of fibre, 21 grams of sugar, 4 grams of protein, and 125 milligrams of sodium. In my opinion, most people would serve themselves a slice that’s larger than 1/24 of the cake, so it’s worth keeping that in mind when considering the nutritional information.

Ingredients

The ingredients list is very typical for a store-bought cake. There are a lot of food additives, emulsifiers, stabilizers, artificial colors, and highly processed ingredients. The cake contains milk, wheat, egg and soy and may contain peanut, tree nuts, sesame, triticale, barley, oats and rye,

Scoring

Taste: 7.5/10

Cost: 7/10

Convenience: 10/10

Nutrition: 0/10 (One point for the strawberries on top).

Overall

Give it a try!

The cake is good, but I was hoping for more of a lime flavor, I feel like this cake tastes more like lemon.

Have you tried the Costco Kirkland Signature Key Lime Cake? What did you think of it?

Please note that this review was not paid for or sponsored by any third party. This product was purchased by Costcuisine for the purpose of producing this review. The opinions in this review are strictly those of Costcuisine. Costcuisine is not affiliated with Costco or any of its suppliers. In the event that Costcuisine receives compensation for a post from the manufacturer of a product or some other third party, the arrangement will be clearly disclosed (including where the manufacturer of a product provides Costcuisine with a free sample of the product).