Keto Frozen Lemonade – Chick-fil-A Copycat
Published July 11, 2020 • Updated March 15, 2026
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I made this keto frozen lemonade to kill a Chick-fil-A craving without the 64g of carbs their version carries. Fresh lemon juice, low-carb vanilla ice cream, and a blender. That is the whole recipe, and it tastes like the drive-through version at a fraction of the carbs.
I have been making this keto frozen lemonade since the first time I drove past Chick-fil-A and realized their small Frosted Lemonade packs 64 grams of carbs. That is roughly three days of keto in one cup. So I came home, pulled out the blender, and started testing.
The base is simple: fresh-squeezed lemon juice, ice, water, a scoop of low-carb vanilla ice cream, and monkfruit sweetener. What makes it work is the tartness from real lemon cutting through the creaminess of the ice cream. Bottled juice does not do the same thing. I have tried it side by side, and bottled loses that sharp tartness cut. Without it, you end up with something that tastes more like a sweetened cream float than a lemonade.
For the ice cream, I have tested Rebel, Enlightened, and Breyers CarbSmart. Rebel gives you the thickest, most milkshake-like texture. Breyers CarbSmart is easier to find and still blends smooth. Either way, you want a vanilla base that is creamy, not icy. If your ice cream is mostly air and ice crystals, the finished drink will be thin.
One thing two different readers flagged (and I completely agree with): start with half a tablespoon of monkfruit, not the full amount. The cooling effect from monkfruit compounds once everything is blended cold. I always taste after the first blend and add more if I want it sweeter. You can always add. You cannot take it back out.
I made this in January. I have made it in February. The craving does not care what month it is, and neither do I. If you want something lighter, try my keto lemonade without the ice cream. If you want a fruit twist, my keto strawberry lemonade is a good starting point for a blended version with berries. And if the milkshake angle is what you are after, my keto vanilla milkshake goes all in on that texture.
This is a sugar-free copycat that I have served to people who did not know it was low carb until I told them. My neighbor’s kid drained her glass before her mom could pour a second one. When a child who side-eyes everything keto finishes first, that is the only review I need.
If you like blended drinks, my keto frappuccino uses a similar base technique with coffee instead of lemon.
How to Make Keto Frozen Lemonade
I blend this the same way every time, and the order matters more than you would think. Start with the water and lemon juice at the bottom of the blender, then ice, then ice cream on top. If you put the ice cream at the bottom, it sticks to the blades and you get uneven chunks instead of a smooth pour.
Use half a tablespoon of monkfruit to start. Blend everything for about 30 seconds, taste it, and decide if you want it sweeter. The cold amplifies that cooling aftertaste monkfruit can have, so going slow here saves you from a batch that tastes more like sweetener than lemon.
If your drink comes out too thin, add another quarter cup of ice cream and pulse twice. Too thick, add a splash of water. I land on the right texture about 90% of the time with the base recipe, but blender power varies and ice cream density varies, so taste and adjust. The consistency you want is thick enough to hold a straw upright for a second before it sinks. Similar to how I blend my keto raspberry smoothie, but with more ice for that slushy bite.
Ingredients
2 cups of water -
1 cup ice
-
1/2 cup of freshly squeezed lemon juice or concentrate
-
1/2 cup low-carb vanilla ice cream (see below for keto approved brands)
-
1 tablespoon monkfruit or use sweetener of choice
-
pinches of salt
Nutrition disclaimer
The nutrition information provided is an estimate and is for informational purposes only. I am a Doctor of Pharmacy (Pharm.D.); however, this content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always consult your physician or other qualified health provider before making any lifestyle changes or beginning a new nutrition program.
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Get My Macros + Recipes →Frequently Asked Questions
Should I use powdered or granulated monkfruit for this frozen lemonade?
I use powdered monkfruit every time. Granulated does not dissolve fully in a cold blend, and you end up with gritty bits at the bottom of the glass. Powdered disappears into the liquid as soon as the blender runs. If you only have granulated, I would dissolve it in a tablespoon of warm water first, then add that to the blender with everything else.
How much sweetener should I start with to avoid the cooling aftertaste?
I start with half a tablespoon and taste after blending. Two of my readers landed on the same fix independently, and I do the same thing in my own kitchen. The cooling effect from monkfruit gets stronger when everything is ice cold, so what tastes fine at room temperature can taste noticeably "minty" once blended with ice. Add a little at a time. You can always blend in more.
What is the difference between Chick-fil-A's Frosted Lemonade and this keto version?
Chick-fil-A's small Frosted Lemonade has around 64 grams of carbs from sugar-loaded lemonade and regular ice cream. My version uses fresh lemon juice, monkfruit sweetener, and low-carb vanilla ice cream, which brings it down to roughly 3 grams of net carbs. I have tested this side by side with the drive-through version, and the tartness-to-cream ratio is close. The main taste difference is the sweetener profile, which is why I go easy on the monkfruit.
Can I make a strawberry or raspberry version?
I have done both. Throw in a quarter cup of frozen strawberries or raspberries and reduce the ice by the same amount so the texture stays thick. Strawberry pairs better with the lemon (the flavors layer nicely), while raspberry can overpower the tartness if you add too much. My keto strawberry lemonade is a good reference for ratios. Start small and blend up.
How do I store leftovers and re-blend from frozen?
I pour leftovers into a freezer-safe container and let them set for a few hours. When I want another glass, I break it into chunks and re-blend with a splash of water. It will not be as smooth as the fresh version (the ice cream loses some creaminess after freezing), but it is still better than anything from a can. I usually make enough for two glasses and drink both the same day.
Which keto ice cream brand gives the creamiest result?
I have tested Rebel, Enlightened, and Breyers CarbSmart in this recipe. Rebel gives the thickest, most milkshake-like result because it has higher fat content and less air. Breyers CarbSmart is my go-to when Rebel is not available because it blends smooth and is easy to find. Avoid brands that are mostly ice crystals and air. You want a dense scoop that actually melts into the liquid.
Can I use bottled lemon juice instead of fresh?
I have made this with both, and fresh wins every time. Bottled lemon juice loses that sharp tartness that cuts through the ice cream, and without it the drink tastes more like a sweet cream float than a lemonade. If bottled is all you have, use it, but make sure it is 100% lemon juice with no added sugar. Just know that the tartness is what makes this recipe work, and fresh delivers it better.
Can I make this dairy-free?
I have tried it with coconut milk ice cream and it works. The coconut adds a subtle tropical note that I actually like with the lemon. Almond milk ice cream tends to be thinner and icier, so if you go that route, use a bit more to keep the texture thick. My frozen hot chocolate uses a similar dairy-free swap if you want another reference point.
Chick-fil-A is known for two things: amazing chicken sandwiches and frozen lemonade! Today we’re making a sugar-free version of their creamy lemonade milkshake. This frozen lemonade is the perfect frosty summertime treat. It’s made with low-carb ice cream and sugar-free lemonade, topped with homemade whipped cream.
This creamy lemonade milkshake is lightly sweet and mildly tart. It’s the ideal blend of both flavors.
Lemons are keto! I love cooking and baking with lemons because they add flavor and brighten up a dish. Lemons are loaded with vitamin C and only have 3.4 grams net carbs in one lemon.
This is a copycat Chick-fil-A frozen lemonade recipe, so of course we have to add ice cream to this milkshake! Luckily, there are some great sugar-free ice creams available at the grocery store. Make sure you check the nutrition labels. I find that many brands are still higher in carbs than you’d want. In this recipe, we only add 1/2 cup ice cream for the entire recipe and it serves 4 people, so those carbs don’t add up to much.
Some great vanilla ice cream brands to try:
My favorite blender is by 
Made this Saturday because my daughter kept begging for Chick-fil-A. She watched me blend it with full skepticism, then went quiet after the first sip. Just picked up her cup and wandered back to her room. That silence said it all. Keeping lemon juice stocked from now on.
Three ingredients and I was skeptical. Lemon juice, low-carb vanilla ice cream, and water felt too simple to actually pull off a Chick-fil-A copycat. But the fresh lemon juice really does something here, and mine came out frothier than I expected from my basic blender. Taking off a star because it ran a little thin (needed more ice, probably), but the flavor was spot on and I'm making it again this weekend with a bigger handful.
Tried two other keto frozen lemonade recipes before this and neither got the texture right. This one does. I think it's the vanilla ice cream -- it's what gives that creamy, frothy pull that makes the original worth sitting in the Chick-fil-A line. Use fresh lemon juice if you have it, not concentrate. You'll taste it.
If you freeze the lemon juice in an ice cube tray first, you can skip the extra water and cut down on the ice too. Made it both ways and the frozen juice version is noticeably more lemon-forward. Small change but worth trying if you want it punchy.
Frozen lemon cubes is such a smart swap. The water dilutes the lemon as it melts down so you lose that punch. Trying this next batch.
Tastes remarkably close to the real thing, but if you use concentrate instead of fresh lemon juice, bump the sweetener up a notch. The sourness hits differently and throws off the balance a bit. Still made it twice this week, so clearly not a dealbreaker.
The acid's there but not that sharp fresh bite, and that's what cuts through the ice cream. Good tip for the concentrate crowd.
My daughter's been asking for Chick-fil-A lemonade every time we pass one. In March that means every errand is a negotiation. Made this Saturday, handed her one without a word. She took a sip and goes 'this is it, this is the one,' completely serious. Had to tell her twice it came from our blender before she believed me. The fresh lemon juice does it, that little bite that cuts through the sweet. My husband never touches lemonade and he quietly finished the whole glass. All four servings gone in 20 minutes. Already planning a double batch.
'This is it, this is the one' said completely seriously is a better review than anything I could put in a caption. A husband who never touches lemonade quietly finishing the glass is the real win. Double batch, yes.
Brought a big batch of this to a cookout last weekend and my buddy kept asking what brand of lemonade I bought. Had to tell him twice it was homemade with low-carb ice cream and monkfruit before he believed me. Two blenders worth gone in under an hour. Now apparently I'm the person who has to bring this to every cookout.
Had to tell him twice is the best version of this story. The drive-through texture is what gets people, they just don't believe it came out of a blender until they see it happen.
Pretty close to the drive-through version. I would start with half a tablespoon of monkfruit instead of the full one, the cooling aftertaste was noticeable until I dialed it back. Second batch nailed it.
Half a tablespoon is where I land too. The aftertaste gets louder once everything's cold, way more than the dry powder lets on.
My daughter gave me a look when I pulled out the blender, but she drained her glass before I could even pour mine. From a kid who side-eyes everything keto, that's a four-star review.
Side-eyes from a keto skeptic and still first to finish. The fresh lemon is what gets them, even when they're suspicious of the blender.
Start with half the monkfruit and taste before adding more, I almost covered up the lemon tartness on my first batch and that tartness is the whole point.
That tartness is what makes it taste like the drive-through version, not just a sweet slush. Sweetener is way easier to add than it is to take out.
Low-carb ice cream blended into lemonade sounded like it would ruin both things. I only tried it because I had lemons that needed using and the Chick-fil-A craving was real. The tartness from fresh-squeezed juice cuts through the creaminess in a way I wasn't expecting. Other keto lemonade attempts I've made have that diet-drink aftertaste, but this one doesn't. The monkfruit keeps it sweet without tasting fake. Making this in February feels a little unhinged but the craving doesn't care what month it is.
Ha, I've made this in January. February is practically peak season. Fresh lemon is everything here. Bottled loses that tartness cut and then it just tastes like a sweetened cream float.