Sourdough Starter 101: What to Know Before You Bake In Denver
So you brought home a little jar of dried sourdough starter from the office. First of all — welcome to the club. 🥖✨
Sourdough baking is equal parts science, patience, and “trust the process.” And if you’re baking here in Denver, altitude adds its own personality to the mix. Lilith is my at home starter that originated from King Arthur Starter and has survived a cross country move and a forgetful keeper.
This guide will walk you through:
How to rehydrate your dried starter
How to feed and maintain it
What to expect in the first few days
A beginner-friendly sourdough bread recipe adjusted for Denver altitude
Let’s get you on the way to successful bread!
Ready to rehydrate your starter?
Your dried starter is dormant — not dead. Think of it like it’s been in hibernation. This is a shelf-stable way to keep starter for our office and also in case you wanted to give it away in the future. Fed starter is dried by spreading it across parchment paper in a thin layer and allowing it to dry out overnight.
Day 1: Wake It Up
Place your dried starter in a clean glass jar. (The jar you bought it in from our office is perfect for this step!)
Add 4 tablespoons of warm (not hot) filtered water.
Let it sit for about 1 hour to soften or until it appears to have fully rehydrated.
Stir in 2 tablespoons bread flour.
Cover loosely (a lid resting on top or cloth with rubber band) and let sit at room temperature (68–75°F is ideal).
You may not see much activity yet. That’s normal. You would be lazy too after hibernation.
Feed Daily Until It Reliably Doubles
For the next 3–5 days:
Discard about half of the mixture.
Feed with:
1/4 cup bread flour
1/4 cup filtered warm water
Stir well and let it sit at room temperature. Repeat daily until you notice it doubles easily with lots of bubbles.
What You’re Looking For:
Bubbles forming throughout
A slightly tangy smell (pleasant, not harsh)
Doubling in size within 4–8 hours after feeding
Once it consistently doubles after feeding — it’s ready to bake with.
When to Toss It: Signs Your Starter Isn’t Safe
Sourdough starter is resilient — but it’s still a living culture. Occasionally, things can grow that aren’t part of the plan.
Here’s what to watch for:
🚫 Pink or Orange Streaks
If you see pink, orange, or salmon-colored growth, discard it immediately.
This is often a sign of unwanted bacterial contamination (sometimes called “pink mold” or Serratia bacteria). It is not safe to scrape off and keep using. The entire starter should be thrown away, and the jar thoroughly washed with hot soapy water.
When in doubt — throw it out.
🚫 Fuzzy Mold (Green, Black, Blue, or White and Fuzzy)
If you see fuzzy spots that look like bread mold:
Green
Black
Blue
White and fuzzy (not just bubbles — actual fuzz)
Discard the entire starter. Do not try to save a portion.
Healthy starter bubbles look glossy and wet — mold looks dry or hairy.
🚫 Strong Rotten or Putrid Smell
Healthy starter smells:
Tangy
Yeasty
Slightly sour
Sometimes like yogurt or beer
Unhealthy starter smells:
Rotten
Like gym socks in a bad way
Extremely harsh or putrid
If it smells aggressively foul (not just sour), discard and restart.
✅ What Is Normal (Even If It Looks Weird)
Don’t panic if you see:
Gray liquid on top (hooch — it’s just hungry)
hooch is an alcohol by product of the yeast that acts as a protective coating to prevent colonization by other microbes
Separation
A thin dry layer if it wasn’t covered tightly
Sluggish rising in colder weather
Most “weird” starter behavior is just hunger or temperature-related.
How to Prevent Contamination
A few simple habits go a long way:
Always use clean jars and utensils
Wash hands before feeding
Use filtered water (chlorine can disrupt fermentation)
Keep loosely covered, not sealed airtight
Don’t store near obvious mold sources (like fruit bowls going bad)
And if something goes wrong? It’s okay.
Sourdough is forgiving — and dried starter exists for a reason. You can always start again.
If you ever bring your starter in and say, “Is this supposed to look like this?” I promise I will not judge. I will absolutely nerd out with you about it.
How to Store Your Starter
Once your starter is active and reliably doubling, you have two easy storage options depending on how often you bake.
🏡 Option 1: Keep It on the Counter (Frequent Bakers)
If you bake multiple times per week:
Store your starter at room temperature.
Feed it every other day (or daily if your house runs warm).
Discard half before each feeding and refresh with a 1:1 flour and warm filtered water ratio.
This keeps it strong, active, and ready to use anytime.
❄️ Option 2: Store It in the Fridge (Infrequent Bakers)
If you bake occasionally (once a week or less):
Keep a small jar of starter in the refrigerator.
When you're ready to bake:
Remove it from the fridge.
Let it come to room temperature.
Feed it.
Allow 1–2 feedings (12–24 hours) until it’s bubbly and doubling again before baking.
Cold storage slows fermentation — it doesn’t kill it. Think of the fridge as “pause mode” and know that I keep Lilith in her small jar in the fridge for months at a time when I am not in the mood for baking.
High-Altitude Sourdough Bread (Denver-Friendly Recipe)
Baking at 5,280 feet changes things. Dough rises faster and can overproof easily. This recipe accounts for that.
Ingredients:
100g active sourdough starter (fed and bubbly)
350g warm filtered water
500g bread flour
10g salt
(Using grams is strongly recommended for consistency.)
Step 1: Mix
Mix water and starter until milky.
Add flour and salt.
Stir until shaggy dough forms.
Knead dough gently for about 1 minute to start forming some strength so your loaf isn’t a frisbee.
Cover and let rest 30 minutes (autolyse).
Step 2: Stretch & Folds (Instead of Aggressive Kneading)
Over the next 2 hours:
Every 30 minutes, do a set of stretch and folds (4 total rounds).
Keep dough covered between sets.
Step 3: Bulk Fermentation (Shorter in Denver)
Let dough rise at room temperature for 3–4 hours total.
Look for:
30–50% increase in size
Air bubbles along sides
Slight jiggle
Do not wait for doubling at altitude — it may overproof which leads to overly dense loaves.
Step 4: Shape
Turn dough onto lightly floured surface.
Shape into a tight round.
Place in floured proofing basket or bowl. I use a glass bowl so it plops out easier.
Step 5: Final Proof
Option A (Same Day):
Proof 45–75 minutes at room temp.
Option B (Better Flavor):
Refrigerate 8–12 hours overnight.
Step 6: Bake
Preheat Dutch oven to 475°F for 30 minutes.
Score top of dough.
Bake covered 20 minutes.
Reduce to 450°F and bake uncovered 20–25 minutes.
Internal temp should reach ~205–210°F.
Let cool on backing rack or other breathable surface completely before slicing (this part is hard but important).
A Few Denver-Specific Tips
Dough ferments faster here — watch the dough, not the clock.
In winter, your house may be drier. Slightly increase water if dough feels stiff.
In summer, shorten bulk fermentation slightly.
If your bread spreads instead of rises, it likely overproofed.
Why Sourdough?
Beyond being delicious, sourdough:
Is naturally fermented
May be easier to digest
Has a lower glycemic impact than conventional bread
Encourages slow, mindful cooking
There’s something deeply regulating about mixing, folding, waiting, and creating something alive in your kitchen. Starter is basically a Tamagatchi and the dough has PlayDough vibes so consider it inner child work!
