From Starter to First Loaf — What Happens Next
Your sourdough starter is mature. Here's the week between bake-ready starter and baker-ready you — the UK plan, equipment, and bake-day schedule.
Your sourdough starter is bubbling, doubling, and smells like yoghurt. That means it's mature — but it doesn't yet mean you should bake. Most first loaves fail because the starter was ready, but the baker wasn't. Here's what to do in the week between starter-mature and first-bake: the four bake-ready signs to trust, the equipment to gather, the working-week schedule that fits a UK kitchen, and the small honest mistakes most beginners make on day one.
The four signs your starter is bake-ready
Before you mix a single gram of dough, you want four things from your starter. Each one tells you a different thing, and the more of them you have, the more confident your first bake.
How do I know my sourdough starter is ready to bake?
A sourdough starter is ready to bake when it doubles in size within 4 to 12 hours of feeding, smells gently of yoghurt rather than vinegar, and behaves the same way for three feeds in a row. The classic float test — a teaspoon of starter floating on water — is a confirmation, not a replacement, for those three signs. Most UK starters are bakeable around day 10 to 14.
Sign 1 — predictable peak time (4–12 hours)
Feed your starter at the same time each day for three days. Mark the jar with a hair band at feed time, and watch how long it takes to double. In a UK kitchen at 18–22°C, anywhere between 4 and 12 hours is healthy. What matters more than the exact number is that the number is roughly the same three days running. A starter that peaks at 5 hours one day and 14 hours the next isn't yet predictable — and predictability is the whole point.
Sign 2 — a clean yoghurt aroma at peak
Lean in and smell the jar at peak. It should smell gently of natural yoghurt, with a fruity-sweet note in the background. If it smells of nail varnish, sharp vinegar, or wet socks, it's past peak, hungry, or imbalanced — feed it twice in a day for two days and recheck. (More on this in our complete guide to UK sourdough starters.)
Sign 3 — the float test (and why it's optional)
What is the float test for sourdough starter?
The float test for a sourdough starter is a quick check: drop a teaspoon of recently-fed starter into a glass of room-temperature water. If it floats, the starter is full of gas and likely ready to bake; if it sinks, it isn't at peak. The float test is useful but not definitive — a starter can fail the float test and still bake a strong loaf, and vice versa.
Sign 4 — three consecutive successful feeds
The most reliable single sign. Three feeds, three doublings, three days running, three matching aromas. If you've got that, you've got a starter you can bake with. (See our feeding rhythm guide if you're still settling into a routine.)
Why most people bake too soon (bake-ready vs baker-ready)
What do I do when my sourdough starter is mature?
When your sourdough starter is mature, you don't bake straight away — you spend a week building consistency. Feed it on a steady rhythm (we use 1:5:5 once a day), watch that the peak time and aroma are repeatable, then plan a bake date that fits your week. The starter is the ingredient; the bake-day plan is the recipe.
The starter is the ingredient — you are the cook
Here's the framing we want you to carry: a mature sourdough starter is an ingredient, like a really good butter or a properly seasoned cast-iron pan. Having the ingredient doesn't mean the meal is ready. The starter is bake-ready. You — your kitchen, your schedule, your equipment, your headspace — also need to be baker-ready.
The mistakes we made when we rushed
When Clara baked her first loaf in 2009, she fed the starter that morning and mixed dough that afternoon. The loaf was edible but flat. Looking back, she was bake-ready and not baker-ready — no banneton substitute prepared, no Dutch oven preheated long enough, no clear idea of bulk-ferment time. The starter took the blame. The starter wasn't the problem.
Your final preparation week — a Monday-to-Sunday plan
How long after my starter is ready can I bake?
Once your sourdough starter is mature, plan to bake within 3 to 7 days. That window gives you time to stabilise the feeds, gather equipment, and choose a bake day that suits your week. Baking sooner than three days often produces a flatter loaf because the starter's behaviour hasn't yet been observed long enough to predict.
This is the plan we'd give a friend who's just hit the four signs. Use the planner below to drop it onto your real week. The principle: stabilise the feeds, gather the kit, pick a bake day, and protect that day.
- Mon–Wed: stabilise the feeds. Feed once a day at the same time, 1:5:5 ratio (20 g starter, 100 g flour, 100 g water). The slower ratio gives a more predictable peak — usually 8–12 hours in a UK kitchen — and a cleaner aroma. Mark the jar. Note the peak time.
- Thu: shopping and last big feed. Buy your flour (we recommend a strong UK white bread flour like Wessex Mill, Marriage's, or Shipton Mill for a first bake — or supermarket Allinson's Strong White if those aren't to hand). Check your kit list. Feed the starter as usual.
- Fri evening: mix the dough. After dinner, mix the dough with the recipe you'll find in the first-loaf walkthrough we'll publish on 19 July. About 6–8 minutes of work. Cover and leave on the counter.
- Sat: bulk ferment + shape + cold retard. Saturday is the slow day: stretch-and-folds in the morning, bulk fermentation through the early afternoon, shape in the late afternoon, then into the fridge for an overnight cold retard. You're not chained to the kitchen — it's about 20 minutes of actual work spread across the day.
- Sun morning: bake day. Preheat the oven and Dutch oven for 45 minutes on full whack (250°C). Take the dough straight from fridge to hot pot. Score. Bake covered 20 minutes, uncovered 20–25. Cool for an hour before cutting. Coffee in the meantime.
When-to-Bake Planner
Drop the plan onto your actual week.
Plan your first bake
Set your starter-mature date above to generate your bake plan.
Equipment you'll actually need (with cheap UK alternatives)
The big lie of beginner sourdough is that you need £200 of gear. You don't. Here's what we'd actually buy from scratch, the cheap UK alternatives that work just as well, and the things you can skip entirely.
The "essential / nice / skip" matrix
| Item | Books say | Honest verdict | UK cheap alternative | UK price |
|---|---|---|---|---|
| Dutch oven | Le Creuset Round 24cm | Essential — but not the brand | Aldi Crofton cast-iron casserole 24cm | £15.99 |
| Banneton | 25cm round cane proofing basket | Nice to have | Kitchen colander + clean tea towel + rice flour | £0 (you own them) |
| Lame (scoring blade) | Wire-handled professional lame | Essential | A clean razor blade or sharp paring knife | £0–£3 |
| Dough scraper | Bench scraper + bowl scraper | Essential, both | Lidl Crivit silicone scraper + an old credit card for the bench | £1–£3 |
| Digital scales | 0.1 g jewellery scales | Essential (1 g resolution fine) | Lidl Silvercrest digital kitchen scales | £4.99 |
| Probe thermometer | Thermapen | Nice to have | Any £8 probe thermometer from Lakeland/Argos | £8–£12 |
| Proofing basket cover | Linen cloche | Skip | A second tea towel | £0 |
| Stand mixer | KitchenAid for autolyse | Skip — sourdough barely needs one | Your two hands and 6 minutes | £0 |
Aldi and Lidl as your Le Creuset alternative
The US sites will tell you to buy a Lodge Combo Cooker (£90) or a Le Creuset round oven (£280). Don't. Aldi's Crofton cast-iron casserole is currently £15.99 and bakes a beautiful loaf — Clara has used one for years for her "weekday" loaves. Lidl's Esmee equivalent is £19.99 and similar. Both have the two things that actually matter: thick cast iron and a tight-fitting lid. Get one. Use it for stews when you're not baking.
A tea towel and colander instead of a banneton
A banneton is a proofing basket. Lovely if you have one, totally optional if you don't. Line a kitchen colander with a clean tea towel, dust the towel generously with rice flour (rice flour is the trick — plain flour sticks), and proof the shaped loaf in there. We baked into the third year of The Sourdough Hub before we owned a proper banneton.
Schedule a bake date that fits a working week
The UK working-week framing — bake on Sunday morning
If you work Monday–Friday, the rhythm that fits best is: mix Friday evening, ferment and shape Saturday, cold-retard Saturday night, bake Sunday morning. The cold retard does most of the work while you sleep. You're never up before 7 a.m. on a workday for sourdough.
What changes if you work shifts or weekends
The plan rotates cleanly: a shift worker with Wednesday/Thursday off mixes Tuesday evening and bakes Thursday morning. Cold retard is forgiving — anywhere from 8 to 48 hours works, and longer retards give a tangier crumb. Pick the bake day that suits your week, then count backwards two days.
What to expect on your first loaf (and what's normal)
A flatter, denser loaf is normal — and still delicious
We want to set expectations honestly. Your first loaf will probably be flatter and denser than the cover-shot loaves on Instagram. The crumb might be tight rather than open and airy. The crust might be paler than the deep mahogany you've seen. None of this means it's failed. It means you've baked a first loaf — and so did every baker who eventually baked a great one.
The three things that will go right
The aroma — yeasty, faintly sweet, almost cake-like — will be right. The crust will crackle as it cools (this is called "the singing crust" and we promise it sings). And the inside, even if it's denser than you hoped, will taste like nothing you've bought from a supermarket. That's enough for loaf one.
What we'll cover next (the rest of Cluster C, previewed)
Eight upcoming guides, one line each:
- Complete UK Beginner's Guide to Baking Your First Sourdough Loaf — the recipe and full method, the article this whole bridge points to.
- Sourdough Hydration Explained (75% / 78% / 85%) — what those numbers mean and which to pick.
- Bulk Fermentation and Cold Retard — A UK Timing Guide — exact timings for UK kitchen temperatures.
- How to Score Sourdough Bread (With Patterns) — the lame, the angles, the simple patterns to start with.
- Why Is My Sourdough Flat, Dense or Gummy? — the troubleshooter you'll want after loaf one.
- Sourdough Proofing — How to Know Your Dough Is Ready — the poke test and the visual signs.
- Best Flour for Sourdough Bread in the UK — Wessex, Marriage's, Shipton Mill, Allinson's compared.
- Sourdough Without a Dutch Oven — UK Home Oven Methods That Work — for bakers without cast iron.
Frequently asked questions
My starter is doubling but I'm scared to bake. How long can I wait?
As long as you like, within reason. A mature starter can sit happily on the counter with daily feeds for weeks, or live in the fridge for one to two weeks between feeds. Don't let "I'm not ready" turn into "I never baked" — pick a bake date in the next 10 days, write it down, and aim at it.
Can I bake the same day my starter first doubled?
You can, but we'd ask you not to for a first bake. One doubling is one data point; three is a pattern. Give your starter (and yourself) three days of consistent peaks before betting flour and time on a loaf. The bake will be better for it.
Do I really need a Dutch oven, or can I bake on a tray?
A Dutch oven (or any heavy lidded cast-iron pot) genuinely matters — it traps steam, which gives oven-spring and crust. A flat baking tray won't do the same job. But you don't need a £200 one. The £15.99 Aldi cast-iron casserole bakes a beautiful loaf.
What if I miss my planned bake day?
Push it. If you'd planned Sunday and life got in the way, your shaped dough in the fridge is fine for another 24 hours (so bake Monday instead). If you hadn't shaped yet, just feed the starter on its usual schedule and move the whole plan one week along.
Should I do the float test before mixing?
Only as a confirmation. We do a float test on bake-day morning out of habit, but a starter that fails the float test and is at peak with a clean yoghurt aroma will almost always bake a good loaf. Treat the float test as a thumbs-up, not a gatekeeper.
Will my first loaf look like the pictures?
Honestly, probably not. First loaves are usually flatter, denser, and paler than the cover-shot loaves you've seen. That's fine — it's still a loaf you made, and it will taste better than supermarket bread. Loaf two will be better than loaf one. Loaf ten will be the one you photograph.
What's next
Once your starter has hit the four signs and you've planned your bake day, the next read is the first-loaf walkthrough — that pillar is publishing 19 July. In the meantime, how long it really takes covers the calibration calendar, and our complete guide to UK sourdough starters stays the pillar that ties everything together.
