Making Milk Kefir at Home: Simple Instructions From Years of Experience

I have been making milk kefir from traditional heirloom grains since 2010. Over that time I've moved house several times and the kefir grains have come with me.  In my experience, keeping milk kefir going long term is remarkably simple, the biggest challenge is paying for the milk!

To avoid any doubt, milk kefir 'grains' are not grains or seeds of any kind.  Other than the common name of grains they are not similar in any way.  Milk kefir grains are complex and continuously changing mixture of colonies of beneficial bacteria and yeasts growing in a matrix of kefiran that is bobbing around in milk. 

I drink milk kefir and make my breakfast with it, my kids drink milk kefir daily, over that time I have never had any issues with safety, over the years no one has ever fallen ill from consuming my home made milk kefir.  

My milk kefir grains in strainer

What ratio of kefir grains to milk should I use 

There seems to be a lot of confusion on the internet over how much milk kefir grains to use.  

If you're completely new to milk kefir, you may want to read my beginner's guide to milk kefir grains first, where I explain what kefir grains are and how to make kefir at home.

The thing to remember when making kefir is it is not an exact science, the temperature it is kept at is not overly important, and the ratios used don't matter hugely.  As long as you don't use too few grains for the amount of milk, it will still work.

Milk kefir originally comes from nomadic tribes in the Caucasus mountains in Russia.  These people weren't measuring anything precisely, they had kefir grains in a skin bag with mare's milk or yak milk, and they kept kefir going for generations.  A lot of effort was made by the government at the time to obtain the kefir grains, which is a fascinating story.  

Most people use between a quarter of a teaspoon of grains per cup of milk, up to a quarter of a cup of grains (16 teaspoons) per cup of milk.  

I tend to use far more grains than this for no other reason than I have them.  It ferments faster and gets a little more sour.    

If using too few grains for the amount of milk, fermentation takes longer, and you may run into issues with contaminants taking over.  For this reason I suggest not going lower than one teaspoon of kefir grains per cup of milk.  If using more grains, kefir ferments faster.  

I drink kefir plain, I soak raw buckwheat in kefir overnight to consume raw the next morning, sometimes (often around Easter) I make tvorog using kefir.  I like kefir, and some of my kids like it too.

It seems weird that you can leave milk on the bench for days and not have any problems, the living cultures generally create conditions that discourage many unwanted microorganisms from multiplying.  As mentioned, I generally use more grains than most people, this makes it highly unlikely anything undesirable can grow in there.  

Milk kefir I cover with strainer but a cloth also works

Simple milk kefir recipe 

(Note: this can be scaled up as needed)

1) Add anywhere between 1 teaspoon to 1/4 cup of kefir grains to a large glass jar (not metal).

2) Add about a cup of milk to the jar. 

3) Do not put on a lid.  Cover the jar with a cloth or something to keep out dust/insects but lets in the air.  I use a plastic strainer.

4) Leave the jar on the bench out of direct sunlight.  Do not put in the fridge.  

5) Leave for about a day (12-48 hours) to ferment.  The longer it ferments the more sour it becomes.

6) Stir briskly, then strain out the grains.  The strained liquid is your kefir to drink, this can be stored in the fridge for a few days until ready to drink.  

7) Put the grains and a few spoonfuls of liquid kefir in a glass jar.  Repeat from step 2.

One teaspoon of my milk kefir grains

If the kefir separates into curds and whey, that is normal, and it's still fine to drink.  Once you stir (step 6) it all gets mixed together.  

If you go away on holiday you can leave your kefir grains in some milk in the fridge, I recommend putting a lid on the jar while in the fridge.  The grains can survive in the fridge like this for a few weeks.  Being in fridge makes kefir angry, the next few batches will be sour.  

Your grains will multiply.  You can eat them, they are probably better for you than the kefir liquid.  The more kefir grains you add to milk, the faster it ferments.  

The speed of fermentation varies depending on the weather, summer ferments faster than winter.  You can adjust the amount of grains used if you want it more consistent, or you can embrace the seasonal changes.  Either option is fine.  You don't need to keep kefir heated, it was made by nomads living in yurts for generations, they certainly didn't heat their kefir.

Sometimes kefir is more yeasty and the kefir gets lightly bubbly.  Other times there is less yeast activity and the kefir is flat.  Sometimes your grains will be large, other times the grains will be small.  This will all change over time, it is all normal.

Milk kefir ready to be strained

New to kefir? See my beginner's guide to milk kefir grains for step-by-step instructions and troubleshooting tips.

Common Questions

How do I know when milk kefir is ready?

Fresh kefir usually thickens slightly and develops a pleasant tangy smell.  Small pockets of whey may appear around the edges of the jar.  Kefir is ready whenever it tastes right to you. Some people prefer a mild kefir after 12 hours, while others prefer a more sour kefir fermented for longer.  The longer it ferments, the more sour it becomes.

Why did my kefir separate?  Is this a problem?

This is normal, it means your kefir has fermented a bit more than normal.  This happens in warmer weather, or when using more grains.  Just stir before straining.

I have too many kefir grains, can I eat the grains?

Yes, kefir grains are edible.  Some people eat them directly or blend them into smoothies.  Kefir grains can also be fed to poultry.  

Why does fermentation speed change?

Temperature, grain quantity, and milk type all affect fermentation speed.  Don't expect it to be uniform, it will change with the seasons.

Milk kefir grains in a jar

Where to get heirloom milk kefir grains

If you'd like to start making your own kefir, you'll need a healthy culture of milk kefir grains.  

My kefir grains have been made for a few years using A2 milk.  My grains will work in any cow, sheep milk, goat milk, or milk from any other mammal - the taste will change depending on what type of milk you use.  I've never tried them in any plant based milk.   

I sell a decent amount of kefir grains, many places only sell 1 teaspoon

My kefir grains usually multiply faster than I can use them, so I occasionally have extras available on my my for sale page along with other fermenting cultures, perennial vegetable plants, culinary herbs, and seeds I offer.  

Most sellers provide around a teaspoon of grains.  I sell closer to a quarter cup of grains, which gives beginners a larger, more active culture and makes it easier to start producing kefir immediately and helps ensure beginners are likely to succeed.