10 Worst Snacks at Costco in 2026

⚠️ We analyzed snacks available at Costco and ranked them by ingredient safety score. Here are the worst options based on real ingredient data.

#ProductBrandScoreAdditivesSeed Oils
1 Trail Mix Snack Packs Kirkland,Kirkland Signature,M&M's 0/100 9 4
2 Mini Muffin Bites Chocolate Chip Kirkland Signature 7/100 14 2
3 Peanut Butter Pretzels Kirkland Signature 10/100 5 3
4 Kirkland peanut butter pretzels Kirkland Signature 24/100 2 2
5 Soft & Chewy Granola Bars, Chocolate Chip Kirkland Signature 27/100 7 5
6 Chocolate Chip Cookies Kirkland Signature 28/100 4 None
7 CHOCOLATE CHIP COOKIES, CHOCOLATE CHIP Costco Companies Inc. 28/100 4 None
8 Organic Roasted Seaweed Snack Kirkland 30/100 1 1
9 Microwave Popcorn Movie Theater Butter Kirkland Signature 30/100 1 3
10 Organic Roasted Seaweed Snack Kirkland 30/100 1 1

See also: Healthiest Snacks at Costco

How We Rank Snacks at Costco

Our rankings analyze every ingredient in each product against a database of 500+ additives, preservatives, artificial colors, seed oils, and allergens. Each product gets a score from 0 to 100:

Frequently Asked Questions

What are the worst snacks at Costco?
Based on our ingredient analysis, the #1 worst snacks at Costco is Trail Mix Snack Packs by Kirkland,Kirkland Signature,M&M's with a score of 0/100.
How many snacks at Costco did you test?
We analyzed snacks products available at Costco, scoring each for additives, seed oils, allergens, and overall ingredient safety.
How often are these rankings updated?
Rankings are updated as new products are scanned and added to our database. All scores reflect the current formulation of each product.

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📋 Cite This Data
APACheckIt AI. (2026). "10 Worst Snacks at Costco in 2026 — Ranked by Ingredient Safety | CheckIt AI". Climaverse PBC. Retrieved from https://getcheck.it/worst/snacks-at-costco
MLA"10 Worst Snacks at Costco in 2026 — Ranked by Ingredient Safety | CheckIt AI." CheckIt AI, Climaverse PBC, 2026-04-17. https://getcheck.it/worst/snacks-at-costco.
HTML Embed<a href="https://getcheck.it/worst/snacks-at-costco">10 Worst Snacks at Costco in 2026 — Ranked by Ingredient Safety | CheckIt AI — CheckIt AI</a>
BibTeX@misc{checkit2026worstsnacksatcostco, title = {10 Worst Snacks at Costco in 2026 — Ranked by Ingredient Safety | CheckIt AI}, author = {CheckIt AI}, year = {2026}, publisher = {Climaverse PBC}, url = {https://getcheck.it/worst/snacks-at-costco}, note = {Retrieved 2026-04-17} }