Fermentis SafAle US-05 Dry Brewing Yeast - 500 g Review (2026)

The strain behind the pack

SafAle US-05 is Fermentis's dry American ale yeast, and according to the manufacturer's own technical data sheet it ferments in a range of about 64 to 79 degrees Fahrenheit with 78 to 82 percent apparent attenuation and 9 to 11 percent alcohol tolerance. Fermentis describes it as having low ester production and medium flocculation, which is why it shows up in such a wide range of American ale styles, from pale ales and IPAs to blondes and browns, where brewers want the hops and malt to lead rather than fruity or spicy yeast character. This 500 g size is simply a bulk format of the same strain sold in smaller 11.5 g sachets, not a different yeast.

Why buy it in 500 g

A single 5 gallon batch typically needs only one small sachet of dry yeast, so a 500 g brick represents dozens of pitches from one purchase. That makes it a practical option for brewers who ferment large batches, brew very frequently, run a small commercial nano setup, or want to split the yeast into vacuum sealed sub packages for friends or future brews. Buying in this format usually works out cheaper per gram than repeatedly buying small sachets, which is the main appeal for anyone whose brewing volume justifies it. For someone who brews a handful of batches a year, however, this quantity is far beyond what a single fridge shelf of homebrew needs.

Pitching and rehydration

Fermentis's technical sheet gives a recommended dosage of 50 to 80 grams per hectoliter, and the yeast can either be pitched directly into wort above 68 degrees Fahrenheit or rehydrated first in at least ten times its weight of sterile water or wort at 77 to 84 degrees Fahrenheit for 15 to 30 minutes before pitching. Direct pitching is simpler and common among homebrewers, while rehydration is generally considered gentler on cell viability. Because this is a bulk brick rather than a pre-measured sachet, brewers need their own accurate scale to weigh out the right dose for each batch, which is an extra step compared with tearing open a single-use packet.

Storage after opening

The manufacturer states the sealed product has a shelf life of 36 months from production when stored below 24 degrees Celsius for shorter periods, or below 15 degrees Celsius for longer term storage. Once the brick is opened, though, the exposed yeast is vulnerable to moisture and oxygen, so it needs to be resealed carefully, ideally vacuum sealed in smaller portions, and kept refrigerated or frozen to preserve viability for future batches. Skipping this step and leaving an opened brick loosely closed in a cupboard will noticeably shorten how long the remaining yeast stays viable, undermining much of the value of buying in bulk.

Who this size suits

This 500 g SafAle US-05 brick fits brewers who already know they like the strain and go through enough of it to use up a bulk pack before it ages out, whether that is from batch frequency, batch size, or splitting portions with other brewers. It is not the right choice for someone brewing their first batch or trying the strain for the first time, since a small 11.5 g sachet is cheaper up front and removes any guesswork around weighing doses or long term storage. For its target audience of high volume or cost conscious brewers, it delivers the same reliable, clean American ale fermentation that has made US-05 one of the most common dry yeasts in homebrewing.

Frequently asked questions