Starting Your Sourdough Starter: A Beginner's Guide
If you've been reading along on this journey, you know I spent months researching sourdough before I ever mixed my first batch of dough. And one of the most intimidating parts? Growing a starter from scratch.
It felt like a science experiment. Would it work? Would I mess it up? How would I know if it was ready?
But here's the truth: growing a sourdough starter is one of the most forgiving processes in baking. You're just mixing flour and water and letting wild yeast do its thing. That's it.
If you're ready to start your own starter (yes, that's redundant, but it's also accurate), here's how to do it.
What You're Actually Making
A sourdough starter is a living culture made from flour and water. That's it. No commercial yeast required.
When you mix flour and water and let it sit, you're creating an environment where wild yeast and beneficial bacteria can grow. These microorganisms exist naturally in flour, in the air, on your hands. You're not adding them — you're just giving them the right conditions to thrive.
Over about 10 days (sometimes longer), you'll feed this mixture daily, and it will become a bubbly, active culture you can use to leaven bread, muffins, pancakes, cookies, and more.
Why Bother With This?
You could buy a starter. You could use commercial yeast. So why grow your own from scratch?
Because there's something deeply satisfying about cultivating a living culture in your own kitchen. About watching it bubble and grow. About knowing that the bread you're baking is leavened by wild yeast you captured yourself.
Plus, it's endlessly renewable. Feed it regularly, and it will last for years. Decades, even. Some bakers pass down their starters through generations.
And honestly? It's not as hard as it sounds.
What You Need
- A clean glass jar
- A spoon or whisk
- Unbleached all-purpose or bread flour
- Filtered or dechlorinated water (tap water with chlorine can slow down or kill the yeast)
- A kitchen scale
- Patience
That's it. No fancy equipment. No special ingredients.
The 10-Day Process
Your starter will likely take about 10 days to become fully active and ready to bake with. Some take longer — and that's completely normal. Environment, temperature, and flour type all play a role.
What matters most is consistency. Feed it daily, watch for signs of activity, and trust the process.
Day 1: The Beginning
Mix 25g flour + 25g water in your jar. Stir well. Cover loosely (a towel or loose lid works — you want airflow but not full exposure).
Let it sit at room temperature (70–75°F is ideal).
That's it. Nothing fancy. Just flour and water sitting on your counter.
Day 2: First Feeding
Stir the mixture. You might see tiny bubbles. You might not. Either is fine.
Discard half of the mixture (yes, really — this keeps the ratios right and prevents your jar from overflowing).
Add 25g flour + 25g water. Stir well. Cover loosely.
Days 3–4: Things Start Happening
Repeat the Day 2 process every 24 hours.
By now, your starter should smell tangy or fruity. You'll start seeing bubbles forming on the surface and sides. It might rise slightly after feeding.
This is good. It means the wild yeast is waking up.
Days 5–6: Increasing Activity
Now you're feeding twice a day — every 12 hours.
Each time, keep 25g of starter, discard the rest, and add 25g flour + 25g water.
Why twice a day? Because your starter is getting stronger and eating through its food faster. More frequent feedings keep it healthy and active.
Days 7–10: Almost There
By now, your starter should be doubling (or more) within 4–6 hours after feeding. It should smell pleasantly sour — like beer or yogurt, not rotten or nail polish remover.
It should be full of bubbles, airy, and elastic when you stir it.
If it's doing all of this consistently for three days in a row, it's ready to bake with.
If it's not quite there yet? Keep feeding. You haven't done anything wrong. Some starters just take longer.
What to Expect Along the Way
Sight:
- Days 1–2: Not much happening. Maybe a slight haze or separation.
- Days 3–4: Small bubbles on the surface and sides. Slight rise after feeding.
- Days 5–7: More visible activity — rising and falling after feedings.
- Days 8–10+: Consistent doubling within 4–6 hours.
Smell:
- Days 1–2: Mild and floury. Nothing exciting.
- Days 3–6: Tangy, fruity, sometimes slightly funky. This is normal.
- Days 7–10+: A distinct vinegary or yeasty smell, like beer. This is a good sign.
Activity:
- If things seem sluggish around Day 4, try moving your jar to a warmer spot (75–78°F is ideal).
- See liquid on top? That's called hooch. It just means your starter is hungry. Stir it in or pour it off, then feed.
How to Know It's Ready
Your starter is ready to bake with when it can:
- Double (or more) within 4–6 hours of feeding
- Do this consistently for at least three days in a row
- Pass the float test (drop a spoonful in water — if it floats, it's ready)
If it's not quite there yet, keep feeding. Some starters take 14 days. Some take longer. That's okay. Consistency is what matters, not speed.
Long-Term Maintenance
Once your starter is active and ready, you have two options:
If you're baking daily or multiple times a week: Keep it at room temperature and feed it once a day. I personally use a 1:5:5 ratio (1 part starter : 5 parts flour : 5 parts water). This keeps it strong without requiring constant feeding.
If you're baking weekly or less often: Store it in the fridge and feed it once a week. You can use a 1:3:3 ratio here. Feed it, let it sit at room temperature for 2–3 hours, then put it back in the fridge.
Important: Starter kept in the fridge is "discard" until you feed it and make it active again. Think of fridge storage as hibernation. It's alive, but not ready to bake with until you wake it up.
What About All That Discard?
Every time you feed your starter, you'll discard most of it. This feels wasteful at first, but it's necessary to keep the ratios right and prevent your jar from overflowing.
But here's the good news: you can use that discard. Pancakes, waffles, crackers, muffins, biscuits — all of these can be made with sourdough discard.
I'll save that for another post. For now, just know: you're not wasting it. You're creating opportunities.
Trust the Process
Growing a starter from scratch is a living process, not a perfect one.
Some days it will be bubbly and active. Some days it will seem sluggish. Some days you'll wonder if you're doing it wrong.
You're not. You're just learning to work with a living culture. And living things don't behave on a rigid schedule.
The more you feed it, the more you observe it, the more you'll understand what it needs. And eventually, you'll have a starter that's been with you for months. Years. Maybe even long enough to pass down.
That's the magic of sourdough. You're not just baking bread. You're cultivating something alive.
What was your first sourdough starter experience like? Did it take longer than 10 days, or did it surprise you by being ready early? I'd love to hear your story.
— Courtenay 💙
