How to Freeze Sourdough Bread (and Why We Recommend It)

You brought home a fresh loaf of sourdough, but you know you aren't going to finish the whole thing before it starts getting stale. Don't let it go to waste—freeze it.

Sourdough freezes incredibly well when it's stored and thawed properly. Freezing can help you keep fresh bread on hand for weeks, and there are also some interesting changes that happen to the starch in bread as it's cooled, frozen and reheated.

Here's how we recommend freezing the sourdough you pick up from our farm stand.

Can You Freeze Sourdough Bread?

Yes! Sourdough bread freezes very well.

Freezing slows the processes that cause bread to spoil and become stale, which means you don't have to rush through an entire loaf in a few days. It's especially convenient when you buy fresh, preservative-free bread and want to keep it around longer.

For the best quality, we recommend enjoying frozen sourdough within 1–2 months.

How to Freeze Sourdough Bread

Our sourdough loaves are already sliced, which makes this easy.

Keep the sliced loaf inside its paper bread bag and gently press out any excess air.

Place the entire paper bag inside a zip-top freezer bag. Press as much air as possible out of the freezer bag before sealing it.

Then place the loaf in your freezer.

If your sourdough isn't already sliced, we recommend slicing it before freezing. This also gives you the option of taking out individual slices when you need them.

How to Thaw Frozen Sourdough Bread

How you thaw your bread matters.

When you're ready for your loaf, take it out of the freezer but leave it sealed inside the zip-top bag while it defrosts.

As frozen bread warms up, you may notice moisture or condensation developing inside the bag. Don't open it right away.

Allow the loaf to fully defrost inside the sealed bag. As it comes back to room temperature, much of that moisture can redistribute rather than immediately escaping into the room.

Once the bread is completely thawed, open the bag and enjoy.

For an individual frozen slice, you can also take out what you need and toast it.

Why Long-Fermented Sourdough Is Different

Traditional sourdough is made using a living starter containing yeasts and lactic-acid bacteria.

During a long fermentation, microorganisms and naturally occurring enzymes have more time to act on the flour. The dough becomes more acidic, carbohydrates are fermented, and some components of the grain—including some proteins—are partially broken down.

Our bakery selection includes sourdough that has been fermented for 48 hours, which is one of the reasons we're excited to offer it at the farm.

Some people find traditionally fermented sourdough easier to digest than quickly produced breads. However, traditional wheat sourdough still contains gluten. Long fermentation does not make regular sourdough gluten-free, and wheat sourdough should not be considered safe for someone with celiac disease unless it is specifically made and certified as gluten-free.

What Happens to Sourdough When You Freeze It?

There's another interesting reason researchers have looked at cooling and freezing bread: resistant starch.

When bread is baked, starch absorbs water and changes structure. As cooked starch subsequently cools, some of those starch molecules can reorganize into structures that are harder for our digestive enzymes to break down. This process is known as starch retrogradation, and some of the resulting starch can behave as resistant starch.

Resistant starch isn't digested as rapidly as ordinary digestible starch.

Research on bread has found that freezing, thawing and reheating can change the blood-glucose response to breadunder certain conditions. That doesn't mean frozen sourdough suddenly becomes a low-carb food or a treatment for diabetes. The amount and effect can vary considerably depending on the bread, the person, portion size and how the bread is prepared.

But it is a fascinating example of how the way we prepare and store food can affect more than simply how long it lasts.

Is Frozen Sourdough Better for Blood Sugar?

Possibly in some circumstances—but we don't want to oversell it.

Sourdough fermentation itself can influence how bread is digested, and cooling or freezing bread may change some of its starch structure. Studies have also found differences in post-meal blood-glucose responses depending on how bread has been stored and reheated.

That doesn't make sourdough a "diabetic food," and anyone managing diabetes should consider the total carbohydrates and their individual response.

We simply think it's another interesting reason to freeze the bread you're not going to eat right away instead of letting it go stale.

Can You Refreeze Sourdough Bread?

If you've thawed your loaf and realize you aren't going to finish it within the next few days, you can freeze it again, provided it has been handled and stored safely.

Place the bread back into its paper bag, put that inside the zip-top freezer bag, press out as much air as possible, seal it and return it to the freezer.

Repeated freezing and thawing can eventually affect texture and quality, so freezing individual slices or smaller portions is another good option if you regularly use only a little at a time.

The Easy Version

Freeze:
Keep your sliced sourdough in its paper bag → place it inside a zip-top freezer bag → press out the air → freeze.

Thaw:
Remove it from the freezer → keep the zip-top bag sealed → allow the loaf to completely defrost → open and enjoy.

Didn't finish it?
Seal it back up and return it to the freezer.

It's an easy way to waste less bread and keep fresh sourdough available whenever you want it.

Fresh Sourdough in Vista, California

Looking for fresh sourdough in North County San Diego?

We carry locally baked sourdough at Sand n' Straw Community Farm in Vista, California, along with seasonal produce and other locally made farm-store favorites.

Our bakery selection changes throughout the week and may include classic sourdough, rustic artisan loaves, cheddar jalapeño sourdough, English muffins, cookies, banana bread and seasonal baked goods.

Because our bread can sell quickly, you can also order select breads and farm-store items ahead for pickup and we'll have your order reserved for you.

Come visit the farm, stock up on fresh bread—and if you can't finish the loaf, now you know exactly what to do with it.