Your First 30 Days with a Sourdough Starter: A Complete Guide

The first 30 days with a sourdough starter are the most disorienting. Information online disagrees, your starter does things that look alarming, and you have no baseline for what's normal. This guide is a day-by-day tour of what actually happens — and what each behaviour means — based on the first month of life of the 1,400+ starters we've shipped from our Somerset kitchen.

What follows is the timeline for a starter that arrives live and mature (like ours). If you're building one from scratch, the timeline is similar but adds 7–10 days at the start while wild yeast colonises the flour. We've covered that separately in how to make a sourdough starter from scratch.

Days 1–3: waking up

Your starter arrives dormant — concentrated, cool, slightly grey, with a strong vinegary smell. That smell is the bacteria that have continued working slowly during transit. The yeast is asleep but alive. Your job in days 1–3 is to wake the yeast up.

Day 1

Open the pouch, scrape the starter into a clean glass jar (a 500–750ml jar with a loose lid is ideal). Feed it 50g flour and 50g water at room temperature. Stir to a thick paste. Mark the level on the side of the jar with a rubber band. Cover loosely.

You'll see almost no rise on day 1, and that's normal. Maybe a few small bubbles around the edges by evening. The starter is rehydrating and the yeast is metabolising for the first time in days.

Day 2

Discard half (or use the discard for crumpets — see our discard crumpet recipe). Feed the remaining half with another 50g flour and 50g water. By the evening, you should see a clear rise — maybe 30%, maybe 50%. The rubber band marker tells you exactly.

The smell starts to shift from sharp vinegar towards yoghurt and bread dough. That's healthy yeast taking over from the bacteria that dominated transit.

Day 3

By day 3, your starter should rise visibly within 8 hours of a feed. Half discard, feed 50/50, watch what happens. The first proper double-in-volume usually arrives between day 3 and day 5.

Don't bake yet. The starter is awake but not strong.

Days 4–7: gaining strength

This is when the starter learns to perform consistently. Feed it once a day during this period (twice if your kitchen is over 24°C) and watch its behaviour through the side of the jar.

What you should see by the end of week 1:

• Reliable doubling within 4–8 hours of feeding.
• A domed top with bubbles visible all the way through the body, not just on top.
• A peak that holds for 30–60 minutes before it begins to dimple.
• A pleasant smell — yoghurt, mild beer, fresh bread dough.

By day 7 you can bake a first loaf, but it won't be your best loaf. The crumb might be tighter and the rise less dramatic than the loaves you'll bake at day 21.

Days 8–14: your first bakes

Week two is the right time to mix your first dough. The starter should now double in 4–6 hours reliably. Use it at peak (just before it begins to deflate) and start with a forgiving recipe — our 70% hydration classic is the easiest on a young starter.

Don't be discouraged if your first loaf is dense or under-risen. Even a perfectly behaved starter at 14 days is still developing the deeper, more complex yeast and bacteria population that makes a great loaf.

Things to watch for during week 2:

• Hooch: grey or amber liquid on top. Just means it's hungry — pour off, feed. Full hooch guide.
• Slowing down: if it suddenly takes 12+ hours to peak, your kitchen has cooled (UK autumn does this). Move it somewhere warmer.
• Stronger smell: normal as the bacterial population matures. Sharper tang doesn't mean problems.

Days 15–21: the rhythm sets in

By the end of week three your starter is fully mature. The rise pattern becomes clockwork-reliable: feed at 8am, peak at 1pm, fall by 6pm. This consistency is what lets you plan bakes around your schedule rather than chasing the starter's schedule.

Now is also when most home bakers realise they're carrying too much starter. You don't need 500g of starter on the counter — 100–150g is plenty. Discard down to 30–50g and feed 1:5:5. You'll waste less flour and your starter will be just as happy.

The fridge transition

If you bake once a week (or less), the fridge is a kindness for the starter. After day 21, do this:

1. Feed your starter as normal.
2. Wait 2 hours.
3. Lid on (still loose), into the fridge.
4. Take it out the night before your next bake, feed it, leave it on the counter overnight.
5. It'll be at peak by morning.

A fridge starter can sit between feeds for 7–14 days easily. We've revived month-old fridge starters with two days of room-temperature feeds. They're more robust than they look.

Days 22–30: long-term care

By day 22 the starter is fully your own — the wild yeast and bacteria from your specific kitchen have integrated into the original culture. From this point on, you're maintaining rather than developing.

Long-term care reduces to four habits:

• Feed weekly if it lives in the fridge. Take it out, feed, two hours, back in.
• Feed twice daily for two days before any bake.
• Watch the smell. Sweet/tangy/wheaty is healthy. Acetone or strong solvent smell means it's chronically underfed — increase your ratio.
• Don't fuss over it. A mature starter is patient. Skip a feed, no big deal. Forget it for two weeks in the fridge, also fine. It's tougher than the internet makes out.

Things you'll worry about that aren't actually problems

"It rose loads on day 3, then died for two days"

The early rise is bacteria — the leuconostoc population that boomed on the new flour. As the yeast catches up they outcompete the bacteria, and the starter goes quiet for a day or two while the population shifts. Normal. Keep feeding.

"It smells like nail polish remover"

Acetone smell = hungry yeast producing ethanol metabolites. Feed more frequently or with a bigger ratio. The smell goes away within a few feeds.

"There's a brown crust on top"

You've left the lid too loose or the kitchen is dry. Scrape it off, feed below, screw the lid on a fraction tighter (don't seal — it needs to breathe).

"It looks grey/dull"

Oxidation. Stir it. The colour returns within a few minutes.

"There are bubbles all over but it didn't rise much"

You've fed too thin a ratio (too much water, not enough flour) so the gas escapes faster than it builds. Use less water or more flour. Aim for thick-pancake-batter consistency.

Things that ARE problems

Pink, orange, or red streaks

Bacterial contamination. Bin and start again, this is uncommon and usually traced back to using a previously dirty jar.

Fuzzy mould (white, blue, green, black)

Bin and start again. Mould has roots — scraping doesn't help.

Slimy, ropy texture

Bacterial spoilage. Bin.

No activity at all for 5+ days despite warmth and feeding

Rare with a live shipped starter, more common with from-scratch starters. May need a different flour (try wholemeal or rye for a few feeds) or a true fresh start.

The schedule cheat sheet

Stage	Days	Feed frequency	Ratio	Where
Wake-up	1–3	Once a day	1:1:1	Counter, warm spot
Strengthening	4–7	Once a day	1:1:1 to 1:2:2	Counter
First bakes	8–14	Once a day	1:2:2	Counter
Maturity	15–21	Once a day or every other	1:5:5	Counter or fridge
Long term	22+	Weekly (fridge) or 2x daily before bake	1:5:5	Fridge between bakes

What you'll know by day 30

If you've been paying attention, by day 30 you can look at your starter and tell within 30 seconds whether it's ready, whether it needs feeding, whether your kitchen is too cool. You'll have baked 3–5 loaves, each better than the last. You'll have made discard crumpets at least once. You'll have stopped panicking when the starter does something unexpected, because you'll have seen most of the unexpected things already.

That intuition — knowing the starter the way you know a pet — is what 30 days gives you. It's the foundation of every loaf you'll bake from then on.

FAQ

How often should I feed in the first month?

Days 1–14: once a day. Days 15+: once a day on the counter, or weekly in the fridge. Twice a day for 1–2 days before any bake.

Can I bake on day 7?

You can but a day-7 loaf is rarely as good as a day-14 loaf. The starter is still developing strength.

What if I miss a feed?

One missed feed is fine. Two missed feeds — feed twice in succession over the next 24 hours and you're back. Three or more missed feeds with hooch — pour off, feed at 1:5:5, give it 2–3 days of attention.

Should I name my starter?

Up to you. Most bakers do — it's hard to throw away discard from a thing you've named.

Why does my starter smell different from my friend's?

Because every kitchen has a different microbial fingerprint. Yours integrates wild yeast from your air, your flour, your hands. Two starters from the same mother culture in two different kitchens taste subtly different after a month.

The kitchen kit you'll want by week 4

You don't need fancy gear, but a few small purchases save hours of frustration in the first month. Most home bakers we've taught end up buying these in roughly this order:

1. Digital kitchen scale (£10). Volume measurements are useless for sourdough. Buy one that reads to 1g and has a tare button.
2. Probe thermometer (£6). The single most underrated tool. Knowing your dough is at 23°C versus 19°C changes everything.
3. Glass jar with loose lid for the starter (£3). Wide-mouth, around 500ml. The jar that comes with our kit is exactly this.
4. Bench scraper (£5). Cheap metal one. Used a thousand times in your first month.
5. Banneton or mixing bowl + tea towel (£12 or free). For shaped final proof.
6. Dutch oven (£25–60). The single biggest leap in loaf quality. Worth it after your fifth bake.
7. Lame or sharp blade (£3). For scoring. A clean razor blade is fine.

Total starting kit, around £45 if you go thrifty. Can grow with you as you bake more.

What 'mature' means at the end of 30 days

People throw the word "mature" around without defining it. By month-end, your starter should pass all five readiness signs (doubling in 4–8 hours, float test, smell, full bubble structure, predictable rhythm) every single feed. It should produce hooch only after extended neglect, not regularly. It should bake reliable bread without you having to coddle it. And — perhaps most importantly — it should fade into the background of your kitchen routine. The constant attention of week 1 should be replaced by the muscle memory of week 4. That's maturity.