How Long Does It Take to Make Yogurt?

Quick Answer

8–24 hours is the total time to make homemade yogurt, but only about 30 minutes of that is active work. The rest is hands-off incubation time where beneficial bacteria culture the milk into yogurt. Shorter fermentation (6–8 hours) yields milder, thinner yogurt, while longer fermentation (12–24 hours) produces a tangier, thicker result with less lactose.

Step-by-Step Timeline

Step	Time	What to Do
Heat milk	10–15 min	Heat milk to 180°F (82°C) to denature whey proteins for thicker yogurt
Cool milk	30–45 min	Cool to 110–115°F (43–46°C) – too hot kills the starter culture
Add starter	2 min	Stir in 2–3 tablespoons of plain yogurt with live cultures (or powdered starter)
Incubate	7–24 hours	Hold at 100–115°F (38–46°C) undisturbed
Chill	4–6 hours	Refrigerate to stop fermentation and firm up the yogurt

Incubation Times by Method

The incubation method you choose affects both convenience and consistency:

Method	Temp Control	Incubation Time	Notes
Instant Pot (yogurt mode)	Automatic	8–12 hours	Most foolproof; set and forget
Oven with light on	~100–110°F	8–12 hours	Free option; check temp first
Yogurt maker	Automatic	7–10 hours	Purpose-built; very consistent
Cooler/thermos method	Passive heat retention	8–12 hours	No electricity needed; less precise
Sous vide / water bath	Precise	6–24 hours	Most precise temperature control

Temperature Matters

The ideal culturing range is 100–115°F (38–46°C). Temperature affects the final product:

• Higher temps (110–115°F): Faster fermentation (6–8 hours), milder flavor, slightly thinner texture.
• Lower temps (100–105°F): Slower fermentation (12–24 hours), tangier flavor, more complex taste.
• Below 90°F: Fermentation stalls; bacteria become sluggish and yogurt may not set.
• Above 120°F: Bacteria die and milk will not culture into yogurt.

Factors That Affect Thickness

• Milk fat content: Whole milk makes thicker yogurt than skim.
• Heating to 180°F: This step denatures whey proteins and is the biggest factor for thick, creamy yogurt. Skipping it produces thinner results.
• Fermentation time: Longer fermentation = thicker and tangier.
• Straining: For Greek-style yogurt, strain through cheesecloth for 1–4 hours after chilling. This removes whey and roughly doubles the thickness.
• Milk powder addition: Adding 2–4 tablespoons of nonfat dry milk per quart boosts protein and thickness.

Equipment You Need

• Heavy-bottomed pot (or Instant Pot)
• Thermometer (essential for beginners)
• Whisk
• Clean jars or containers with lids
• Plain yogurt with live active cultures (as starter) or freeze-dried starter culture
• Optional: cheesecloth and strainer for Greek-style

Common Mistakes

• Adding starter to hot milk: Kills the bacteria. Always cool to 110–115°F first.
• Disturbing during incubation: Moving or stirring breaks the curd structure.
• Incubating too long (24+ hours): Can produce excessively sour, grainy, or separated yogurt.
• Using yogurt with additives as starter: Choose plain yogurt labeled "live and active cultures" with no thickeners.
• Not saving starter: Reserve 2–3 tablespoons from each batch to start the next one (works for 5–10 batches before weakening).