Frozen custard and frozen yogurt are not the same thing. They differ in their base ingredients, texture, fat content, and how they taste. Frozen custard is built on egg yolks, cream, and sugar, while frozen yogurt swaps out the eggs and cream for cultured milk (yogurt) and sugar. That core difference changes nearly everything about these two desserts.
What Makes Frozen Custard Different
Frozen custard is essentially a richer version of ice cream. Its defining ingredient is egg yolk. Under federal food standards, a product must contain at least 1.4% egg yolk solids by weight to be labeled “frozen custard.” If bulky flavors like fruit or cookie pieces are added, that minimum drops slightly to 1.12%, but the eggs still need to be there. Regular ice cream has no such egg yolk requirement.
Those egg yolks serve a practical purpose: they act as an emulsifier, binding fat and water together to create an exceptionally smooth, dense, creamy texture. Frozen custard is also typically churned with less air than standard ice cream. The ideal amount of air incorporation for soft frozen desserts generally falls between 30% and 60%, and frozen custard tends to sit on the lower end of that range. Less air means a denser, heavier product that coats your mouth more richly.
What Makes Frozen Yogurt Different
Frozen yogurt starts with cultured milk rather than cream and eggs. The yogurt base gives it a characteristic tangy flavor that frozen custard completely lacks. There’s no egg yolk involved, and the dairy used is typically lower in fat than the heavy cream found in custard.
One feature that sets frozen yogurt apart from both ice cream and frozen custard is its bacterial cultures. Yogurt is made by fermenting milk with specific bacteria, and those cultures can survive the freezing process. Research published in the Journal of Dairy Science found that probiotic bacteria in frozen yogurt did not decrease during frozen storage, meaning the live cultures present before freezing remained viable afterward. Whether those cultures survive in meaningful numbers depends on the specific brand and how it’s processed, but the potential for probiotic content is something frozen custard simply doesn’t offer.
Calories, Fat, and Sugar
The nutritional gap between these two desserts is significant, mostly because of fat. A half-cup serving of full-fat vanilla ice cream (which is compositionally close to frozen custard) contains about 140 calories and 7 grams of fat. The same serving size of frozen yogurt comes in at roughly 111 calories and 3 grams of fat. Frozen custard, with its egg yolks and cream base, would land in a similar range to ice cream or slightly higher.
There’s a tradeoff to watch for, though. Lower-fat frozen desserts often compensate with extra sugar to keep the flavor appealing. If you’re choosing frozen yogurt because it seems like the lighter option, it’s worth checking the label. The calorie savings from less fat can be partially offset by added sweeteners, especially in flavored varieties or self-serve shops where toppings pile up quickly.
Taste and Texture
The eating experience is where you’ll notice the biggest difference. Frozen custard is rich, velvety, and coats your tongue. It tastes indulgent, like a particularly luxurious ice cream, with no tartness at all. The egg yolks give it a subtle depth and an almost silky finish that standard ice cream can’t quite match.
Frozen yogurt, on the other hand, has a lighter body and a noticeable tang from the cultured milk. It feels refreshing rather than indulgent. The texture is smoother than sorbet but noticeably less dense than custard. If you’ve ever had both side by side, you’d never confuse them. They’re aiming for completely different experiences.
How They’re Typically Served
Frozen custard is most associated with the Midwest and East Coast of the United States, particularly at dedicated stands and restaurants. It’s often made in small batches and served fresh, sometimes within minutes of being churned. Brands like Culver’s and Shake Shack have brought it to a wider audience. You’ll usually find it scooped or served soft, with a limited daily menu of flavors.
Frozen yogurt became a mainstream phenomenon through self-serve shops where you fill your own cup and choose from dozens of toppings. It’s positioned as a lighter alternative to ice cream and is widely available in grocery store freezer aisles as well. The two desserts occupy very different spaces in the market: custard leans into richness and craft, while frozen yogurt leans into customization and perceived healthfulness.
Which One to Choose
If you want the richest, most indulgent frozen dessert you can get, frozen custard is hard to beat. The egg yolks and cream create a texture and depth of flavor that frozen yogurt isn’t trying to replicate. If you prefer something lighter with a tangy kick, or you’re looking for a lower-fat option that still satisfies a dessert craving, frozen yogurt is the better fit. They’re both dairy-based frozen desserts, but that’s roughly where the similarities end.