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Greek yogurt
Level 1 · beginner
Plain yogurt with some of its whey drained off. It's always strained in the fridge, and it comes out thick and creamy.
- Time
- 4–7h
- Temperature
- 105–115°F
- Jar
- 1L
The golden rule: pasteurized milk, the temperature watched with a thermometer, and if it doesn't set, it goes.
No sign-up. We guide you step by step, from the scale to the fridge.
Reviewed October 26, 2026 · 30 facts, each with its source
Before you start
Greek yogurt, or Greek-style yogurt, is plain yogurt that has been strained. With some of the whey gone, it's thicker and creamier. First you make the yogurt, with the figures from the National Center for Home Food Preservation (NCHFP), and then you strain it in the fridge for 2 to 4 hours, as the Illinois Extension guide says. You'll need a thermometer.
You'll need
- 2-quart saucepan or a double boiler
- Kitchen thermometer, essential
- Spoon for stirring
- Cup or small bowl
- Glass jars with lids, 1 liter (about a quart) in all
- Yogurt maker, or a cooler with 110 °F water
- Large strainer
- Cheesecloth, twice as wide as the bowl
- Bowl that fits in the fridge, to catch the whey
Step by step
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Heat the milk to 185–200 °F and hold it for 20 minutes
Wash the saucepan, jars, spoon, cup, strainer and bowl in hot soapy water, rinse them well and let them air-dry. Pour the milk into the pan and heat it gently, stirring, until the thermometer reads 185 to 200 °F. Hold it there for 20 minutes: the yogurt comes out thicker, which is what you want here. Don't let it boil.
Tip: This heat doesn't replace pasteurization: the milk has to be pasteurized already.
-
Cool it quickly to 112–115 °F
Set the pan in a sink of cold water and stir now and then until the milk drops to 112–115 °F. It should get there in less than 1 hour, and never take more than 2.
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Mix the yogurt with a cup of milk and stir it back in
Take out a cup of the warm milk and stir it into the 60 g of yogurt until smooth. Pour it into the pan and stir. The mixture should be at 110–112 °F. Pour it into the jars right away and put the lids on. That's 60 g per liter, NCHFP's ratio of ¼ cup of yogurt per quart of milk.
Tip: Use a yogurt without gelatin. Gelatin keeps the whey from draining, and then it won't strain.
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Keep the jars at about 110 °F for 4 to 7 hours
Put the jars in the yogurt maker or in a cooler. If you use a cooler, warm it first with almost-boiling water, pour that out and fill it with 110 °F water halfway up the jars. Check the temperature every hour: it should stay between 105 and 115 °F. If it drops, add hot water. Don't move the jars.
It's ready when it has set firm. If it hasn't set by 10 hours, throw it out and start again with a new starter. That's a house rule: 10 hours is the longest any guide gives, Illinois's.
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Strain it in the fridge for 2 to 4 hours
As soon as it sets, put the jars in the fridge. Once the yogurt is cold, fold the cheesecloth into a double layer and line the strainer with it. Set the strainer over the bowl so it doesn't touch the bottom, and spoon in the yogurt. Cover the bowl and leave it in the fridge for 2 to 4 hours. At 2 hours it's creamy; at 4, thicker.
Tip: Don't strain it outside the fridge, not even for a while: straining is always done cold.
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Move it to a clean jar and refrigerate it
Spoon the strained yogurt into a clean jar, close it and keep it in the fridge, at 40 °F or below. NCHFP gives strained yogurt 7 to 14 days; count on 7, the shortest.
Tip: Strain it for 8 to 24 hours and it becomes labneh.
No sign-up. We guide you step by step, from the scale to the fridge.
Variations
The same method, a different flavor. Once you have this one down, try one of these.
How to tell it's going well
- Always use pasteurized milk. The heating step doesn't replace pasteurization.
- Use a thermometer. The milk must cool to 112–115 °F in less than 1 hour, never more than 2, and incubate between 105 and 115 °F. Below 98 °F the bacteria grow poorly.
- If it doesn't set, throw it out. It can mean a bad starter or microbes that shouldn't be there.
- Always strain it in the fridge.
- In the fridge for 7 days at most. With fresh fruit stirred in, eat it the same day and within 3 days at most.
- If mold appears or it smells like anything but yogurt, throw it all out. Mold can reach below the surface. Don't sniff it.
Where every number comes from
Every number in this recipe comes from a food safety guide. We keep a copy of each source and quote its exact words.
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1
Draining the whey makes it thicker, Greek style
“Removing whey will yield a thicker, more viscous product (Greek style).”
Province of British Columbia (Ministry of Health, BCCDC Environmental Health Services, Fraser Health), Guidelines for the Production of Dairy Products in Food Establishments · Sample documentation: Yogurt, production of dairy products in food service establishments · read on October 25, 2026
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2
Straining is always done in the fridge
“Straining step must be performed under refrigeration.”
Province of British Columbia (Ministry of Health, BCCDC Environmental Health Services, Fraser Health), Guidelines for the Production of Dairy Products in Food Establishments · Sample documentation: Yogurt, production of dairy products in food service establishments · read on October 25, 2026
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3
Greek-style yogurt drains for 2 to 4 hours in the fridge
“Cover the container and refrigerate. For yogurt cheese, drain for 8 to 24 hours. For Greek-style yogurt, drain for 2 to 4 hours.”
University of Illinois Extension · Making Yogurt at Home, Best Practice Guide (modified May 2024) · read on October 25, 2026
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4
Cheesecloth twice as wide as the bowl, folded double
“Cut a piece of cheesecloth twice as wide as the bowl or container used to drain the yogurt. Fold the cheesecloth in half to make a double layer.”
University of Illinois Extension · Making Yogurt at Home, Best Practice Guide (modified May 2024) · read on October 25, 2026
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5
The cloth hangs above the bottom of the bowl
“Secure the cheesecloth so it hangs above the bottom of the bowl, tie it to a handle, or put a strainer between the bowl and the cheesecloth with yogurt.”
University of Illinois Extension · Making Yogurt at Home, Best Practice Guide (modified May 2024) · read on October 25, 2026
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6
Illinois: 6 to 10 hours, undisturbed
“Incubate yogurt between 108-115 F for 6 to 10 hours, undisturbed.”
University of Illinois Extension · Making Yogurt at Home, Best Practice Guide (modified May 2024) · read on October 25, 2026
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7
No gelatin, which keeps the whey from draining
“Do not use yogurt made with the addition of gelatin. Gelatin will inhibit whey separation.”
National Center for Home Food Preservation (Nummer, 2002); copy hosted by UC Davis Food Safety · Fermenting Yogurt at Home (October 2002) · read on October 25, 2026
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8
Strained yogurt keeps 7 to 14 days in the fridge below 40 °F
“The yogurt cheese has a shelf life of approximately 7-14 days when wrapped and placed in the refrigerator and kept at less than 40°F.”
National Center for Home Food Preservation (Nummer, 2002); copy hosted by UC Davis Food Safety · Fermenting Yogurt at Home (October 2002) · read on October 25, 2026
Show the remaining 22 claims
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9
Always pasteurized milk
“Therefore, always pasteurize milk or use commercially pasteurized milk to make yogurt.”
National Center for Home Food Preservation (Nummer, 2002); copy hosted by UC Davis Food Safety · Fermenting Yogurt at Home (October 2002) · read on October 25, 2026
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10
Heating the milk doesn't replace pasteurization
“Do not substitute this heating step for pasteurization.”
National Center for Home Food Preservation (Nummer, 2002); copy hosted by UC Davis Food Safety · Fermenting Yogurt at Home (October 2002) · read on October 25, 2026
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11
¼ cup of yogurt with live cultures
“Commercial, unflavored, cultured yogurt — Use ¼-cup.”
National Center for Home Food Preservation (Nummer, 2002); copy hosted by UC Davis Food Safety · Fermenting Yogurt at Home (October 2002) · read on October 25, 2026
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12
Per quart of milk
“1-quart milk (cream, whole, low fat, or skim)”
National Center for Home Food Preservation (Nummer, 2002); copy hosted by UC Davis Food Safety · Fermenting Yogurt at Home (October 2002) · read on October 25, 2026
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13
The label must say it contains live cultures
“Be sure the product label indicates that it contains a live culture.”
National Center for Home Food Preservation (Nummer, 2002); copy hosted by UC Davis Food Safety · Fermenting Yogurt at Home (October 2002) · read on October 25, 2026
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14
Equipment washed in hot soapy water and air-dried
“Clean equipment and containers in hot detergent water, then rinse well. Allow to air dry.”
National Center for Home Food Preservation (Nummer, 2002); copy hosted by UC Davis Food Safety · Fermenting Yogurt at Home (October 2002) · read on October 25, 2026
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15
Accurate temperatures are the key
“Accurate temperatures are critical for successful processing.”
National Center for Home Food Preservation (Nummer, 2002); copy hosted by UC Davis Food Safety · Fermenting Yogurt at Home (October 2002) · read on October 25, 2026
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16
Cooled quickly to 112–115 °F
“cool milk rapidly to 112-115°F”
National Center for Home Food Preservation (Nummer, 2002); copy hosted by UC Davis Food Safety · Fermenting Yogurt at Home (October 2002) · read on October 25, 2026
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17
The yogurt goes into a cup of milk; the mix ends up at 110–112 °F
“Remove one cup of the warm milk and blend it with the yogurt starter culture. Add this to the rest of the warm milk. The temperature of the mixture should now be 110-112°F.”
National Center for Home Food Preservation (Nummer, 2002); copy hosted by UC Davis Food Safety · Fermenting Yogurt at Home (October 2002) · read on October 25, 2026
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18
Above 115 °F the culture can die
“Adding culture to very hot milk (+115°F) can kill bacteria”
National Center for Home Food Preservation (Nummer, 2002); copy hosted by UC Davis Food Safety · Fermenting Yogurt at Home (October 2002) · read on October 25, 2026
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19
4 to 7 hours at 105–115 °F
“incubate about 4 - 7 hours at 110°F ± 5°F”
National Center for Home Food Preservation (Nummer, 2002); copy hosted by UC Davis Food Safety · Fermenting Yogurt at Home (October 2002) · read on October 25, 2026
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20
It sets firm once it reaches pH 4.6
“Yogurt should set firm when the proper acid level is achieved (pH 4.6).”
National Center for Home Food Preservation (Nummer, 2002); copy hosted by UC Davis Food Safety · Fermenting Yogurt at Home (October 2002) · read on October 25, 2026
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21
Cold stops the acid; in the fridge at 40 °F or below
“Rapid cooling stops the development of acid. Yogurt will keep for about 10-21 days if held in the refrigerator at 40°F or lower.”
National Center for Home Food Preservation (Nummer, 2002); copy hosted by UC Davis Food Safety · Fermenting Yogurt at Home (October 2002) · read on October 25, 2026
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22
Throw it out if it has mold or smells like anything but yogurt
“Discard any yogurt samples with visible signs of microbial growth or any odors other than the acidity of fresh yogurt.”
National Center for Home Food Preservation (Nummer, 2002); copy hosted by UC Davis Food Safety · Fermenting Yogurt at Home (October 2002) · read on October 25, 2026
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23
185 to 200 °F for 10 or 20 minutes, without boiling
“Hold temperature at 185° to 200°F for 10 minutes for thinner yogurt or up to 20 minutes for thicker yogurt. Do not boil.”
University of Alaska Fairbanks Cooperative Extension Service · Making Yogurt at Home (FNH-00062, reviewed October 2024) · read on October 25, 2026
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24
It grows poorly below 98 °F and dies above 130 °F
“They like warm temperatures, but they can be killed at temperatures above 130°F and will not grow well below 98°F.”
University of Alaska Fairbanks Cooperative Extension Service · Making Yogurt at Home (FNH-00062, reviewed October 2024) · read on October 25, 2026
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25
A cooler warmed first and filled with 110 °F water
“To use an insulated cooler, prewarm the cooler with almost-boiling water. Empty, then fill with 110°F water that comes halfway up the sides of jars filled with 110°F cultured milk.”
University of Alaska Fairbanks Cooperative Extension Service · Making Yogurt at Home (FNH-00062, reviewed October 2024) · read on October 25, 2026
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26
If it doesn't set, throw it out
“Discard batches that fail to set properly since this may be an indication of a bad culture or unwanted microorganisms.”
University of Alaska Fairbanks Cooperative Extension Service · Making Yogurt at Home (FNH-00062, reviewed October 2024) · read on October 25, 2026
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27
Cooled within 1 hour, and never more than 2
“Cooling milk to the inoculation temperature within 1 hour (best practice for commercial and smallscale), and up to a maximum of 2 hours (this is a CCP).”
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.6: Yogurt (April 2024, updated December 2024) · read on October 25, 2026
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28
With fresh fruit, the same day and 3 days at most
“Controlling time, when fresh ingredients are added (e.g. added fruit berries). For example, use yogurt same day, up to a maximum of 3 days, then discard.”
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.6: Yogurt (April 2024, updated December 2024) · read on October 25, 2026
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29
Moldy yogurt goes in the trash
“Yogurt and sour cream Discard Foods with high moisture content can be contaminated below the surface.”
USDA Food Safety and Inspection Service · Molds on Food: Are They Dangerous? · read on October 20, 2026
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30
Don't sniff mold
“Don't sniff the moldy item. This can cause respiratory trouble.”
USDA Food Safety and Inspection Service · Molds on Food: Are They Dangerous? · read on October 20, 2026
