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Recipe

Homemade Crème Fraîche

A tangy, silky, 2-ingredient cultured cream you can stir into soups, dollop on fruit, or swap in for sour cream.

Author By Matt Campbell
4.8
A small glass jar of homemade crème fraîche on a wooden kitchen counter with a spoon resting beside it
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Crème fraîche sounds fancy, but it is basically heavy cream that learned a little manners. You stir in a splash of buttermilk, let it hang out on your counter for about a day, and it turns into a thick, spoonable, lightly tangy dream that makes everything taste a little more put-together.

It is one of my favorite kitchen “why have I not been doing this the whole time” moves. No special cultures. No weird equipment. Just two ingredients, a jar, and a little patience while the good bacteria do their thing.

A close-up of thick crème fraîche being stirred with a spoon inside a glass jar

Why It Works

  • Reliable thickening without drama: the higher fat content helps it thicken beautifully and it is less likely to split than regular sour cream when warmed gently (just do not boil it).
  • 2 ingredients you can actually find: heavy cream plus cultured buttermilk. That is it.
  • Big flavor for tiny effort: it adds richness and a clean tang to everything from soups to scrambled eggs.
  • Flexible timing: ready in about 24 hours, but you can go a little shorter or longer depending on your room temperature.

Pairs Well With

Storage Tips

Refrigerate: Once it is thickened to your liking, cover tightly and refrigerate. It will continue to firm up a bit as it chills.

  • Best window: About 7 days for the nicest flavor and texture, up to 10 to 14 days if it has been handled cleanly and smells fresh.
  • Keep it clean: Use a clean spoon every time to avoid introducing unwanted bacteria.
  • If a little liquid collects: That is normal. Stir it back in.
  • When to discard: If you see mold, pink or orange discoloration, or notice an unpleasant “off” smell or fizzing, toss it.
  • Freezing: Not recommended. It can turn grainy and separate when thawed.

Common Questions

How do I know my crème fraîche is ready?

It should look like loose sour cream or thick yogurt. When you tilt the jar, it should move slowly as one mass instead of sloshing like cream. It will smell pleasantly tangy, kind of like mild yogurt, not funky, fizzy, or sharp.

How long does it take to culture?

Typically 18 to 24 hours at a warm room temperature (aim for about 70 to 75°F / 21 to 24°C). Cooler kitchens can take closer to 30 hours. If your kitchen is very warm (above about 78°F / 26°C), check it sooner.

Do I have to use buttermilk?

For this simple method, yes. You want cultured buttermilk because it contains the live cultures that thicken and acidify the cream safely. Other starters can work (like a spoonful of plain yogurt or an existing crème fraîche), but they can vary brand to brand.

What if it is still runny after 24 hours?

Give it more time and a slightly warmer spot. Sometimes it just needs another 6 to 12 hours. Also double-check that your buttermilk is cultured and lists live, active cultures.

Can I use ultra-pasteurized heavy cream?

Sometimes. Most grocery store heavy cream is ultra-pasteurized and it can work, but it can be slower and less reliable to set. For the most foolproof results, use regular pasteurized heavy cream if you can find it.

Is crème fraîche the same as sour cream?

They are cousins, not twins. Crème fraîche is usually higher fat and a little less tangy. That higher fat also helps it behave better in warm sauces and soups.

Can I bake with it as a substitute for sour cream?

Yes. Use a 1:1 swap in most baking recipes that call for sour cream. It adds moisture and tenderness, especially in cakes and quick breads.

How do I know if it went bad?

When in doubt, toss it. Discard if you see mold, pink or orange discoloration, or it smells unpleasantly yeasty, “off,” or carbonated.

The first time I made crème fraîche, I felt like I was getting away with something. I mixed cream and buttermilk, covered it like a tiny science project, and came back the next day to a jar of thick, tangy magic. Now it is my favorite “quiet flex” ingredient. I keep it around for nights when dinner is a little improvised and I still want that restaurant finish: a cool dollop on hot soup, a creamy swoosh under roasted veggies, or a last-second upgrade to scrambled eggs.