Costco's New Double Chocolate Mint Sundae Review: A Girl Scout Cookie Dream (2026)

Are you ready to trade your pepperoni pizza slice for a dessert that’s causing a stir? Costco’s new Double Chocolate Mint Sundae is here, and it’s giving Girl Scout Thin Mints a run for their money. Just in time for St. Patrick’s Day and Girl Scout Cookie season, this limited-time treat is turning heads—and taste buds—at food courts nationwide. But here’s where it gets controversial: is it worth the extra 50 cents compared to Costco’s classic sundaes? Let’s dive in and find out.

What’s All the Buzz About?

Costco rolled out its Double Chocolate Mint Sundae in mid to late February, though some lucky locations got a sneak peek earlier, sparking a bit of envy among those who spotted it on social media. This sundae features mint soft serve—a new addition to Costco’s two-flavor machines, replacing the usual chocolate option. That means no mint-chocolate swirl, but you can still get a mint-vanilla swirl if you’re not fully committed to the minty experience. The sundae is layered with chocolate sauce and crunchy, chocolatey cookie crumbles, earning its ‘double chocolate’ title. Priced at $2.99, it’s a festive treat that won’t last forever, though Costco hasn’t said exactly how long it’ll stick around.

Is It Worth the Hype?

In one word: absolutely. But let’s break it down. If you’re a fan of Thin Mints, this sundae is a dream come true. The cookie crumbles aren’t Oreos—they’re crunchier and more chocolatey, reminiscent of a Thin Mint without the outer shell. And Costco doesn’t hold back on the crumbs; there’s a generous layer at the bottom and on top. However, I did find myself craving more chocolate sauce, especially in the middle of the cup, where the mint ice cream dominated. Interestingly, another customer’s sundae seemed to have more sauce, so it might just depend on who’s behind the counter.

While the mint flavor leans more toward Shamrock Shake intensity than a Thin Mint’s subtlety, it’s not overpowering. Plus, the sundae isn’t overly sweet, making it easy—and satisfying—to finish the entire cup. My partner and I devoured ours and are already planning our next trip. But this is the part most people miss: the balance of flavors and textures makes it a standout, even among other mint chocolate treats.

Other Minty Delights to Try

If you miss out on Costco’s sundae, don’t worry—mint chocolate season is in full swing, and other fast-food chains have you covered:

  • McDonald’s Shamrock Shake: A classic since 1967, this shake offers a mild mint-and-vanilla flavor that even mint skeptics can enjoy.
  • Wendy’s Girl Scout Thin Mints Frosty: Back by popular demand, this treat combines your choice of chocolate or vanilla Frosty with a minty cookie crumble chocolate sauce.
  • Dairy Queen Mint Oreo Blizzard: A fan favorite, this Blizzard blends Oreo cookie pieces and mint sauce into vanilla soft serve.

Now, here’s the controversial question: Does Costco’s sundae outshine these classics, or is it just another seasonal gimmick? Have you tried it? Let us know your thoughts in the comments—we’re eager to hear if you’re team Costco sundae or sticking with the tried-and-true favorites. And if you haven’t tried it yet, what are you waiting for? This limited-time treat might just become your new obsession.

Costco's New Double Chocolate Mint Sundae Review: A Girl Scout Cookie Dream (2026)
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