The Ultimate Guide to Feeding Your Sourdough: Timing, Ratios, and How to Tell When It's Ready

Feeding your sourdough starter correctly is key to baking great bread. Knowing when to feed it, how much to feed it, and how to tell when it’s ready can feel confusing at first. This guide breaks down everything you need to understand about feeding your sourdough starter, including practical examples of feeding ratios, timing at typical room temperatures, and how to recognize the signs of a healthy, active starter.

Understanding Your Sourdough Starter’s Needs

A sourdough starter is a living culture of wild yeast and bacteria. It needs regular feeding with flour and water to stay active and strong. Feeding provides fresh food for the yeast to consume, which produces the gases that make your bread rise.

When Is Your Starter Hungry?

Your starter is hungry when it has consumed most of its food and begins to weaken. Signs include:

• A thin, watery layer on top (called hooch)

• A sour or alcoholic smell

• Reduced bubbling or rising activity

  
  

At this point, it’s time to feed your starter to keep it healthy and active.

Hungry starter:

How Often Should You Feed?

Feeding frequency depends on how often you bake and the temperature of your environment. At room temperature around 78-80°F (25-27°C), you will likely feed your starter every 4 to 12 hours depending on the feeding ratio you use.

Feeding Ratios and Timing Explained

Feeding ratios describe the amount of starter, flour, and water you mix together. For example, a 1:1:1 ratio means equal parts starter, flour, and water by weight.

Here are common feeding ratios and how long it typically takes for the starter to double in size at 78-80°F:

• 1:1:1 ratio (starter:flour:water)

Takes about 4-6 hours to double

This ratio feeds your starter with equal parts flour and water, making it a balanced, moderate feeding.

• 1:2:2 ratio

Takes about 5-7 hours to double

This gives your starter more fresh food, slowing fermentation slightly and extending the time before it peaks.

• 1:3:3 ratio

Takes about 6-8 hours to double

More flour and water means a longer fermentation time, useful if you want to delay baking or feed less often.

• 1:4:4 ratio

Takes about 7-10 hours to double

This ratio feeds your starter generously, ideal for longer intervals between feedings or cooler temperatures.

• 1:5:5 ratio

Takes about 10-12 hours to double

The starter gets a large amount of fresh food, slowing activity and allowing for overnight or longer fermentations.

Why Adjust Ratios?

Adjusting feeding ratios helps control how fast your starter ferments. If your starter is too active and peaks too quickly, increase the flour and water ratio. If it’s sluggish, reduce the ratio or feed more often.

How to Tell When Your Starter Is Active and Ready to Use

Knowing when your starter is ready to bake with is crucial. Here are signs your starter is at peak activity:

• It has doubled or even tripled in size since feeding

• The surface is bubbly and domed

• It passes the float test: a spoonful floats in water, indicating good gas production

• It smells pleasantly sour, not sharp or alcoholic

  
  

The time it takes to reach this peak depends on your feeding ratio and temperature. For example, a 1:1:1 feed at 78-80°F usually peaks in 4-6 hours, while a 1:5:5 feed may take 10-12 hours.

Active starter:

What Happens After Your Starter Peaks?

After peaking, your starter will begin to fall and lose bubbles. This means it has consumed most of its food and is becoming hungry again. At this point, you should feed it again or discard some and feed fresh flour and water.

Practical Tips for Feeding Your Starter

• Use a kitchen scale for accurate measurements of starter, flour, and water.

• Maintain consistent temperature around 78-80°F for predictable fermentation times.

• Observe your starter daily to learn its unique rhythm and adjust feeding schedules.

• Discard some starter before feeding to keep the total volume manageable and maintain a healthy balance.

• Use filtered or non-chlorinated water to avoid harming the yeast.

• Stir your starter well after feeding to incorporate air and distribute yeast evenly.

  
  

Example Feeding Schedule at 78-80°F

| Feeding Ratio | Time to Double | Notes |

|---------------|----------------|--------------------------------|

| 1:1:1 | 4-6 hours | Quick feed, good for daily baking |

| 1:2:2 | 5-7 hours | Slower rise, good for less frequent feeding |

| 1:3:3 | 6-8 hours | Balanced for moderate activity |

| 1:4:4 | 7-10 hours | Longer fermentation, less frequent feeding |

| 1:5:5 | 10-12 hours | Ideal for overnight or longer intervals |

Adjust these times based on your kitchen temperature and starter behavior.

How to Know How Long It Will Take to Double

The doubling time depends on:

• Feeding ratio: More flour and water slow fermentation.

• Temperature: Warmer temperatures speed up yeast activity.

• Starter health: A strong, well-fed starter doubles faster.

• Flour type: Whole grain flours ferment faster than white flour.

  
  

Track your starter’s rise after feeding by marking the jar or using a clear container. Note the time it takes to double. This helps you plan your baking schedule.

When to Discard Starter

Discarding part of your starter before feeding keeps the culture manageable and prevents it from becoming too acidic or weak. Discard when:

• Your starter volume is too large to feed properly.

• The starter smells very sour or off.

• You want to refresh the culture with new flour and water.

  
  

Discarding is normal and necessary for a healthy starter.

Closing Thoughts

Learning how to properly feed your sourdough starter is one of the most important skills you’ll develop as a sourdough baker. At first, the timing, ratios, and signs of readiness can feel overwhelming. But once you begin observing your starter — watching how it rises, peaks, and falls — you’ll start to understand its rhythm. That’s when sourdough becomes less about strict rules and more about intuition.

A healthy starter doesn’t require perfection — it requires consistency, patience, and attention. The more you practice feeding and tracking its activity, the more confident you’ll feel planning your bakes. Before long, you won’t be guessing when it’s ready — you’ll know.

If you found this guide helpful, consider bookmarking it for future reference or sharing it with a fellow baker who’s just starting their sourdough journey.

Frequently Asked Questions (FAQs)

How do I know if my sourdough starter is strong enough to bake with?

Your starter is ready when it has doubled (or more) in size after feeding, has a bubbly and slightly domed surface, smells pleasantly tangy (not harsh or alcoholic), and reaches its peak within a predictable time frame. The float test can help, but it’s not required if you see strong rising activity.

What if my starter isn’t doubling within the expected time?

Several factors can slow fermentation:

• Your kitchen may be cooler than 78–80°F

• The feeding ratio may be too high (for example, 1:5:5 will take longer)

• Your starter may need a few consistent feedings to strengthen

Try feeding at a 1:1:1 ratio in a warm spot for a few days to boost activity.

Can I feed my starter before it falls?

Yes. While many bakers wait until the starter falls, you can feed at peak or slightly after peak if your schedule requires it. Just avoid letting it sit unfed for long periods once it becomes very acidic or develops hooch regularly.

What happens if I don’t discard before feeding?

If you don’t discard, your starter will grow too large to maintain and may become overly acidic because the yeast doesn’t have enough fresh food relative to its volume. Discarding keeps the culture balanced and manageable.

Can I switch feeding ratios depending on my schedule?

Absolutely. That’s one of the main benefits of understanding ratios.

• Need your starter ready quickly? Use 1:1:1.

• Want it to last overnight? Use 1:4:4 or 1:5:5.

Adjusting ratios gives you control over timing.

Does flour type affect how fast my starter rises?

Yes. Whole wheat and rye flour ferment faster because they contain more nutrients for the yeast and bacteria. White bread flour or all-purpose flour will ferment more slowly but still work beautifully.

What should my starter smell like?

A healthy starter smells mildly tangy, slightly sweet, or yeasty. If it smells very sharp, strongly alcoholic, or unpleasant, it likely needs feeding.

Can I refrigerate my starter instead of feeding daily?

Yes. If you bake less often, store your starter in the refrigerator and feed it about once a week. Before baking, take it out and feed it 1–2 times at room temperature to reactivate it.

If you ever feel unsure about your starter, remember: it’s resilient. With consistent feedings and attention to temperature and ratios, it almost always bounces back.

And if you still have questions, leave them in the comments — sourdough is easier to learn when we share what we’re seeing and experiencing.