Fresh yeast doesn’t last long. If you’re not using it daily, most of each package you buy goes to waste. What if you could freeze fresh yeast?
If you’re a home baker who prefers fresh yeast (or baker’s yeast) over the dry variety, you know how it goes.
You buy a package of yeast, bake some cookies or bread, and put the rest in the fridge. If you’re lucky, you use another small chunk in a different baking project within a couple of days. Then the rest stays in the refrigerator, turns brown, and spoils within a week or so.
Incredibly wasteful, isn’t it?
That’s why I decided to test freezing leftover fresh yeast. This way, if it works out, I no longer need to line up a bunch of yeast-based recipes to use the whole block or throw out the leftovers. And both you and I know those “leftovers” are usually more than half of the package.
Can You Freeze Fresh Yeast?
Before pulling the trigger, I did some research.
I found that there are roughly as many people who say freezing fresh yeast is okay as there people saying it’s either impossible or that the results aren’t consistent. That didn’t help much.
That’s why I decided to put that to a test. If I can’t get consistent results, meaning the baked goods don’t always rise the way they should, freezing the fungus is pointless.
Basically, I want to make sure that when I gather the ingredients, the whole thing won’t fail in its tracks due to the yeast not doing its part.
I described the test I run in the Freezing Fresh Yeast Experiment section at the end of the article. Read for more details and some pictures of what I baked.
Long story short, I confirmed that freezing fresh yeast works just fine, and is a good option if you want to store it for the long term.
How To Freeze Fresh Yeast
This whole procedure is super simple and takes only a couple of minutes.
Before you start, think about how you’re going to use the yeast after thawing, so you know how large your portions should be.
If you use fresh yeast in only a single recipe, it’s easy. But if you have a bunch to choose from, things get complicated. You can decide in advance exactly what you’re going to use those portions for. Or do as I do, and go for same-size chunks that are large enough for most of the baked goods I make.
Once you know your portions, you’re ready to go. Here’s what you should do:
- Unwrap the block and cut it into portions.
- Wrap each chunk in aluminum foil or cling wrap. Make sure they’re wrapped tightly, so the yeast doesn’t dry out. If you didn’t go with same-weight parts as I did, label each one, so you know which is which when it comes time for thawing.
- Put all wrapped slices in a freezer bag or airtight container. If you’re using a bag, squeeze out the air before sealing it.
- Freeze. Stick the bag or container into the freezer.
That’s it. You can leave it there for at least a couple of weeks (I’m still testing how long). See my experiment at the bottom of the article for more details.
How To Defrost Fresh Yeast
To get consistent results, you should always defrost the fresh yeast the same way. I found success with the following method:
- Defrost the portion in the fridge for about 12 hours. That’s enough time for the segment to fully defrost. If your blocks are much bigger than mine (which are about 20 grams each), you might need more time. If they’re smaller, they’ll defrost faster. I usually stick the package in the fridge the night before I need it.
- (optional) Warm the piece up at room temperature for 30 minutes. To help bring the yeast to room temperature, you can give it an additional half an hour before using it. It’s okay if you skip this step if you need to start working on your baking project right away.
- Use. Now the yeast is ready to use in whatever recipe you need it for.
If you forgot to start thawing the chunk yesterday and need it right now, you could try crumbling it onto a plate and leaving at room temperature for 30 minutes. Many people advocate this method, but I haven’t tested it yet. Do it at your own risk.
Using Frozen and Thawed Fresh Yeast
If this is your first time using baker’s yeast after freezing and defrosting it, you might be worried that things won’t work out. That all of the ingredients you prepared will go to waste, and the whole endeavor will become a disaster. I get it.
Fortunately, there’s a process to test yeast’s effectiveness without going all in. It’s called proofing, and I wrote about it in detail in the article about yeast’s shelf life and storage. All you need is some warm water or milk, sugar, yeast, and 10 minutes to see if yeast is still active.
If you’re unsure the thawed yeast will still be effective, proof it. This way, you know for certain if yours will do its job as a leavening agent. Or to put it another way, that your freshly mixed dough will go from this:
Freezing Fresh Yeast Experiment
Here’s a detailed log of what I did as part of the freezing yeast experiment.
May 16, 2020
That’s the day I froze the fresh yeast and started the experiment. Many of the photos in the article are from that day. You can see the way I froze the blocks in the video added to this article.
May 20, 2020 (4 days after freezing)
Today was the first time I tried using frozen and thawed yeast. I did it only four days after freezing the blocks to test as quickly as I could if the process works.
Yesterday, I transferred one block into the fridge, so it was ready in the morning for another batch of bread rolls (or hamburger buns in this case).
The defrosted yeast worked perfectly fine. See for yourself:
This time around I opted for four bigger buns instead of six smaller ones you can see in pictures earlier. Here they are:
My plan is to use another frozen segment within 7 to 14 days of the initial freezing. That means between May 23 and May 30. Check back for updates if you’re interested.