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This year, the McDonald’s Shamrock Shake turns 50. Here’s everything you need to know about the seasonal all-star, from its original flavor to how much sugar it contains.

It’s that time of year again! The green shake has appeared once more on the Golden Arches menu, and fast food lovers have rejoiced as their favorite McDonald’s product made its annual return. Second only to the McRib, the Shamrock Shake has one of the biggest cult followings in the chain’s history. The minty green shake is a seasonal staple, as its loyal fanbase savors the late-February through March period when this drink appears on the menu. Its limited availability is, of course, inherent to its appeal. We only get a month to enjoy the milkshake before it goes back into hibernation for the rest of the year.

Related Reading: McDonald’s Fries Around the World

Now that we’ve finally entered this blessed pre-St. Patrick’s Day season, we decided to take some time to celebrate this beloved beverage by exploring its secret history. Here’s everything you never knew about the Shamrock Shake.

It Was Originally Lemon-Lime Flavored

Yup, it’s hard to conceptualize now, but when the Shamrock Shake was first introduced in the 1970s, it wasn’t minty at all. Instead it was a combination of vanilla ice cream and lemon and lime sherbet. In 1973, they decided to remove the sherbet altogether and just dyed the vanilla ice cream green, but still no trace of mint. It wasn’t until a decade later, in 1983, when the pivotal flavor was added—a major game-changer that forever defined the mint Shamrock Shake we’ve come to love today. (And the McDonald’s website now lists the specific ingredients as “vanilla reduced fat ice cream, Shamrock Shake syrup, and whipped light cream.”)

It Had Its Own Mascot

Shamrock Shake mascot Uncle O'Grimacey


In 1975, Grimace got a visit from his uncle, the aptly named Uncle O’Grimacey!  The character is a fluffy green version of, well, whatever the Grimace is. He would apparently take annual St. Patrick’s Day vacations to McDonaldland to visit his nephew where they would share Shamrock Shakes in furry, familial harmony. We have no idea what happened to Uncle O’Grimacey, but we have a feeling he’s busy partying in Ireland with the Lucky Charms leprechaun.

There Wouldn’t Be a Ronald McDonald House Without It

Okay, so here’s a fascinating story. When Philadelphia Eagles’ tight end Fred Hill’s daughter was diagnosed with leukemia, he was alarmed at how many parents of fellow cancer patients had to spend the night in the hospital (they couldn’t afford hotel rooms nearby after traveling long distances for treatment). Hill sought the help of teammates for a fundraising endeavor. The Eagles’ general manager at the time, Jim Murray, reached out to a friend in advertising who was working on a McDonald’s campaign and suggested a charitable partnership. At the time, there was a promotional push around the Shamrock Shake, and since green is the Eagles’ team color, it seemed like a great match. The company decided to donate a proceed of the profits from the green milkshake towards this initiative. Together they raised enough to buy a four-story house in Philadelphia, which became the first ever Ronald McDonald House. It officially opened on October 15, 1974 and the charity exists to this day.

A Small 12-Ounce Serving Has 63 Grams of Sugar

OK, so you probably already know these are unhealthy by virtue of it being a McDonald’s dessert product, however, did you know a small 12-ounce serving contains a whopping 63 grams of sugar, 460 calories, and 13 grams of fat? We’ll just ignore those nutrition facts while guzzling them down this St. Paddy’s Day.

You Can Make Your Own if You Want to Enjoy It in the Off-Season

Part of its charm really is its ephemeral, seasonal nature, but sometimes the heart wants what the heart wants—and wants it immediately. In this case, you can easily satisfy the craving any time of year. Also helpful if your local McDonald’s has a broken ice cream machine…not that that ever happens.

Copycat McDonald’s Shamrock Shake

There’s no shortage of copycat Shamrock Shake recipes out there, but this one is adamant that for a truly authentic flavor, you should use mint extract (not peppermint extract, as many other versions call for). There’s also vanilla ice cream, whole milk, and some green food coloring in the mix—plus whipped cream to top it off, of course. Get the Copycat McDonald’s Shamrock Shake recipe.

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Boozy Shamrock Shakes

If you want to enjoy a dessert that doubles as a St. Patrick’s Day cocktail, try this boozy milkshake, which gets its cool flavor and mint green tint from creme de menthe, but also includes vodka and Irish cream liqueur for good measure. Sláinte! Get the Boozy Shamrock Shakes recipe.

Vegan Shamrock Shake with Matcha

With frozen coconut milk, fresh mint, matcha green tea powder, almond milk, maple syrup, and fresh spinach, this may be a far cry from the real Shamrock Shake, but it actually sounds (and looks) delicious—plus, you can feel pretty good about drinking it. Not only is it healthy, it’s naturally green! Get the Vegan Shamrock Shake with Matcha recipe.

This post was originally published in 2018 and has been updated with additional images, links, and text.

Header image courtesy of Chowhound.

Jessica is a former Associate Editor at Chowhound. Follow her on Twitter @volume_knob for updates on snacks and cats.
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