Best Keto Key Lime Pie with Pecan Crust (Easy!)

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This sugar-free keto Key Lime Pie with a crunchy pecan crust is the perfect combination of a tart low carb pie filling with a delicious crunchy pecan crust.

keto key lime pie plated with a picture of the pie in a glass pie dish in the background

Best Keto Key Lime Pie Recipe

I might be just a little bit obsessed with this low carb key-lime pie. And while I don’t consider myself to have a major sweet tooth, there are times when it’s nice knowing that I can enjoy a piece of pie without having to overly worry about my carb counts.

What’s great about this low carb pie is that it’s made using real key lime juice and key lime zest, so it does a great job of packing in delicious key lime flavor.

It’s also a great keto pie to bring along to a family or friends gathering if you aren’t confident, there will be a keto dessert there that you can eat. But be ready…once people get wind that a key lime pie is there, they’ll be lining up to get a piece. Once you tell them that it’s keto-friendly and low carb, they won’t believe it tastes so creamy and delicious!

Is this sugar-free key lime pie easy to make?

In all reality, it is. While there are several steps and ingredients involved, I can assure you that the result is worth it.

I’ve made quite a few sugar free pies, and this is one of the best since Key Lime Pie is towards the top of my list of favorite desserts.

pecans crushed in a blender for pecan pie crust

Tip: When making the pecan pie crust, it’s best to use a food processor or blender to get pecans very finely chopped. They need to be in tiny pieces so that they form a crust to hold together all of that delicious pie flavor.

sugar-free pecan crust pressed in a glass pie plate

Where can I buy key limes?

Most grocery stores carry key limes for you to purchase, but they may only offer them seasonally depending on where you live. Check in the produce section and look for key limes that are a bit squishy (but not too much!) to ensure that they’re ripe and will have a lot of key lime juice to use. If you can’t find key limes, regular limes will work, but it may take a little more juice and zest to get that tart flavor.

Tip: Before you start zesting, give the outsides of the lime a good cleaning! Scrubbing away dirt and grime is key, so it doesn’t end up in your mixture. I always soak mine in warm water with a little vinegar for a few minutes before scrubbing.

How many net carbs are in this sugar-free pie?

If you follow the recipes as it is below, there are five net carbs in a piece of this keto key lime pie. Not bad, right?! Now that you know the carb count, you enjoy this delicious pie guilt-free knowing it won’t derail your progress.

keto key lime pie filling in a clear glass bowl

How to Store Keto Lime Pie with Pecan Crust

Once you’re made this sugar free key lime pie, make certain to store it properly. After freezing it so that it sets up, you can store it in the fridge, but it will soften like a pudding or mousse consistency. If you want more of an icebox pie consistency, you can store it in the fridge then set it out a bit before serving so that it thaws enough to slice. It depends on the what consistency you prefer as to if you want to keep it in the freezer or fridge.

Is it possible to freeze this sugar-free key lime pie?

You can freeze this low carb pie for later if you’d like just make sure that it is in a freezer-safe container. I would suggest slicing and freezing individual pieces so that you can grab a delicious piece of keto key lime pie when a craving hits.

glas mixing bowl with low carb key lime pie filling

Keto Specialty Ingredients You’ll Need to Make this Keto Pie Recipe

This low carb pie recipe contains only two ingredients that are considered keto specialty ingredients. Since those who follow a keto or low carb lifestyle avoid regular sugar, a sugar-free substitute is needed. I have found that Lakanto Monkfruit is the perfect substitute that cuts out refined sugar and still gives a sweet and delicious flavor.

spreading sugar-free whipped topping on sugar-free keto key lime pie

If this is your first time making homemade keto whipped topping you’ll love how quickly and easy it comes together plus you avoid so many processed ingredients.

My tip to you for making this delicious Keto Key Lime Pie with Pecan Crust?

Use your kitchen appliances to make the mixing a breeze. This is not one of those recipes that can be easily made with a whisk. You’ll need a good stand or hand mixer to get the delicious creamy filling with cream cheese and heavy cream to mix smoothly for this sugar-free pie.

keto key lime pie plated

More Keto Dessert Recipes You’ll Love:

Key Lime Keto Mousse Dessert Recipe {low carb}

Lemon Blueberry Low Carb Cheesecake Muffins

The Best Keto Coconut Cake: Creamy, Delicious & Homemade

Keto Cheesecake Bites with Peanut Butter

The Ultimate Keto Pecan Pie Recipe

bite of keto key lime pie on a fork and a slice plated with a pie plate in the background.

Yum! Just one bite and you’ll be in love with this tangy-sweet keto key lime pie topped with homemade low carb whipped cream. The buttery pecan crust gives incredible depth and flavor that makes it over the top.

best sugar free pie plated

Creamy & Refreshing Keto Pie Recipes You’ll Love:

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4.59 from 51 votes

Easy Sugar-free Keto Key Lime Pie

This creamy and tangy Sugar-Free Keto Key Lime Pie is refreshing and easy to make with just a few ingredients. The crunchy pecan low carb crust adds incredible flavor that everyone will love.
Prep Time15 minutes
Cook Time10 minutes
Allow Pie to Set up2 hours
Total Time25 minutes
Course: Dessert
Cuisine: American
Keyword: Keto Key Lime Pie, Low Carb Key Lime Pie, Sugar-free Key Lime Pie
Servings: 8 slices
Calories: 424kcal
Author: Kasey Trenum


For the Pie Filling:

For the Pie Topping:


For the Crust:

  • Preheat oven to 350 degrees. Crush pecans finely.
  • Add butter and Monkfruit Classic to crushed pecans and mix thoroughly. I added the ingredients to my mini processor and pulse until all of the ingredients were combined. 
  • Grease a pie pan then add crust mixture. 
  • Grease the back of a spoon and use it to carefully smooth the pecan mixture in the bottom of the pie pan and up the sides. 
  • Bake for 10 minutes and allow to cool.

For the Filling:

  • In a large bowl, beat the heavy whipping cream until it forms stiff peaks.
  • In a separate bowl, beat on medium speed the cream cheese, Lakanto Monkfruit Powdered, lime juice, and lime zest until the mixture is smooth. 
    *You may need more or less lime juice and zest depending on the ripeness of your limes. Make sure to taste the mixture as you are preparing the recipe. 
  • Combine the two bowls and beat with a mixer until everything is combined. 
  • Pour filling mixture into pecan crust and set aside.

For the Topping:

  • Combine the heavy whipping cream and Lakanto Monkfruit Powdered and beat until stiff peaks form. 
  • Spread the homemade whipped cream on top of the key lime layer.
  • Freeze the Keto Key Lime Pie for 1 to 2 hours before serving or until it sets up. (You may store pie in fridge and pop in the freezer for about an hour or two before servng or keep it in the fridge and set out on the counter 30 minutes or so before serving.



The sugar alcohols in Lakanto Monkfruit are not calculated in nutritional information. Nutritional information is only an estimate based on ingredients used in my kitchen. It is always best to calculate your own macros. 
*You may need more or less lime juice and zest depending on the ripeness of your limes. Make sure to taste the mixture as you are preparing the recipe. 


Calories: 424kcal | Carbohydrates: 5g | Protein: 4g | Fat: 44g | Fiber: 1g | Sugar: 2g
Tried this recipe?Mention @kaseytrenumblogger or tag #kaseytrenumblogger!

collage of sugar-free key lime pie


  1. I’m totally confused about the storage instructions. So I should freeze it for two hours, then put it in the fridge until 1-2 hours before I’m ready to serve, and then put it back in the freezer for an hour or two, then take it out and serve? Will it be frozen when I serve it? The alternative instructions say to keep it in the fridge and then let it sit out on the counter for 30 minutes before serving, which sounds like the complete opposite of the previous instruction. Won’t it be soupy if I take it from the fridge and leave it sit on the counter for 30 minutes? Can’t I just freeze for two hours, then store in the fridge and serve straight from the fridge?

  2. Just a heads up on how to tell if Key Limes are ripe, they turn yellow. If you are using green, they are not ripe yet.

    1. So is it better to use green or yellow ones? I almost never see key limes in the store and when I do they’re green. Should I buy green and let ripen before use?

  3. I can’t wait to try this! My husband’s favorite dessert is key lime pie. Kasey, when I meet people who ask about keto recipes, I always send them to your site.

  4. 5 stars
    My husband started on a keto diet about 8 months ago and has stuck to it so well. I wanted to make him something sweet that wouldn’t throw him off his diet and tried this amazing recipe! It’s so easy and absolutely delicious! My kids loved it too!

    1. So glad y’all loved it. Tell your hubs congrats on the keto lifestyle! There are so many great sweet recipes on my site. Thanks for the comment and review!

  5. We have a tree nut and peanut allergy in our house so cannot use nuts. Do you have a suggestion for an alternate for them in the crust? Thank you!

    1. Hey Renee, My daughter is off the charts allergic to all nuts. That is why my recipes use coconut flour instead or almond flour. Yeah this is tough though. There are some recipes that just don’t have great alternatives for certain ingredients. Some keto pie crust recipes use coconut flour but I haven’t tried this. Let me know if you try it and how it turns out.

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