Step Mashing Explained: Rest Temperatures, Schedules and When to Use It

The short answer: step mashing holds the mash at two or more temperatures instead of one. Each rest favours a different enzyme, so you can shape how fermentable the wort is, deal with sticky grains like oats and rye, or bring out the clove in a hefeweizen. With modern, well-modified malt, a single rest at about 152°F (67°C) works for most beers. A simple two-step schedule, 145°F (63°C) then 162°F (72°C), is the one worth learning first.

Step mash rest temperatures

Rest	Temperature	Time	What it does	Use it when
Beta-glucan rest	95–113°F (35–45°C)	15–20 min	Breaks down gummy beta-glucans	Over about 20% oats, rye or unmalted wheat; stuck sparges
Ferulic acid rest	104–113°F (40–45°C)	10–15 min	Frees ferulic acid, which wheat yeast turn into clove flavour	Hefeweizen and other German wheat beers
Protein rest	113–131°F (45–55°C)	10–20 min	Breaks down proteins	Undermodified malt or lots of raw grain. Skip it with modern base malts: a long one can flatten head retention
Beta-amylase rest	140–149°F (60–65°C)	20–45 min	Makes maltose: a fermentable, dry wort	Crisp lagers, saisons, dry beers
Alpha-amylase rest	158–162°F (70–72°C)	15–30 min	Finishes starch conversion, leaves dextrins for body and foam	Almost every step mash, as the last rest
Mash-out	168–170°F (76–77°C)	10 min	Stops the enzymes and thins the wort for lautering	Any beer, especially fly sparging

The two amylase rests are the heart of it. How long you spend in the beta-amylase range decides how dry the beer finishes; the alpha-amylase rest makes sure all the starch is converted. For how single-rest temperatures change body, see our mash temperature chart.

Do you need to step mash?

Most homebrew malt today is fully modified: the maltster has already broken down most of the proteins and cell walls. That is why a single infusion at 150 to 154°F works so well. Step mashing earns its place when you want:

• More control over dryness and body than one temperature gives you, for example a very dry lager that still holds a good head.
• A smoother lauter with a lot of oats, rye or flaked wheat.
• More clove in a hefeweizen.
• Better results from undermodified or floor-malted grain, or a high share of unmalted adjuncts.

If none of those apply, a single rest is simpler and gives the same beer.

Step mash schedules by style

Beer	Schedule
German lagers, pilsner, helles (the "Hochkurz" mash)	145°F (63°C) for 30–40 min → 162°F (72°C) for 20–30 min → 168°F (76°C) for 10 min
Very dry beers (saison, brut IPA, light lager)	145°F (63°C) for 45–60 min → 162°F (72°C) for 15 min → mash-out
Hefeweizen	111°F (44°C) for 15 min → 145°F (63°C) for 30 min → 162°F (72°C) for 20 min → mash-out
Oatmeal stout, rye beers, NEIPA with lots of oats	104°F (40°C) for 15 min → 152–156°F (67–69°C) for 45 min → mash-out
Belgian tripel or golden strong	145°F (63°C) for 40 min → 162°F (72°C) for 20 min → mash-out

For a full lager walkthrough, see our pilsner brewing guide.

How to step mash

With direct heat and recirculation (easiest)

An electric system with a pump does step mashing for you: set the controller to the first rest, then raise the setpoint when the rest is done. The pump keeps wort moving through the grain bed so the whole mash climbs together instead of scorching at the bottom. Raise the temperature steadily, and give the mash a stir at each step if your system allows it.

The Unibräu steps in a single vessel, and the BräuPro and HERMS system hold every rest with a separate mash tun. A mash-out is just one more setpoint change.

With hot water infusions

In a cooler mash tun, you raise the temperature by adding boiling water. The standard formula, in US units:

Boiling water to add (quarts) = (T2 − T1) × (0.2 × G + Wm) ÷ (Tw − T2)

T1 is the current mash temperature, T2 the target, G the grain weight in pounds, Wm the quarts of water already in the mash, and Tw the temperature of the water you add (about 210°F for boiling water). Example: 10 lb of grain in 15 quarts, going from 145°F to 158°F, needs (13 × 17) ÷ 52 = about 4.3 quarts of boiling water.

Start thick (about 1.25 qt/lb) so there is room in the tun for the additions, and plan no more than two steps: each one thins the mash.

With a decoction

The traditional German method: pull out about a third of the thick mash, bring it to a boil, and stir it back in to raise the whole mash to the next rest. It takes longer and adds some malty, bready depth. With modern malt it is optional, but many lager brewers still like it.

Common step mashing mistakes

Problem	Likely cause	Fix
Thin beer, poor head	A long protein rest with modern malt	Skip the protein rest, or keep it under 15 minutes
Beer finished too sweet	Too little time in the 140–149°F range	Lengthen the beta-amylase rest
Overshot the next rest	Heating too fast without recirculation, or too much infusion water	Recirculate or stir while heating; recalculate infusions for the current water volume
Scorched wort or burnt taste	Direct heat under a still mash	Keep the wort moving while the element or burner is on
Stuck sparge with oats or rye	No beta-glucan rest, cold grain bed	Add a beta-glucan rest and rice hulls; mash out at 168°F

Keep an eye on mash pH too: aim for 5.2 to 5.6 at room temperature for every rest.

Frequently asked questions

What is step mashing?

Holding the mash at two or more temperatures in a row, each chosen to favour a particular enzyme, instead of one single temperature.

Is step mashing worth it?

For crisp lagers, very dry beers, hefeweizens and grain bills heavy in oats or rye, yes. For most ales made with modern base malt, a single rest at about 152°F gives the same result with less work.

What is a good simple step mash?

145°F (63°C) for 30 to 40 minutes, then 162°F (72°C) for 20 to 30 minutes, then a 10-minute mash-out at 168°F (76°C).

Do I need a protein rest?

Rarely. Modern base malts are already well modified, and a long protein rest can reduce body and head retention. Use one only with undermodified malt or a lot of unmalted grain.

How long should each rest be?

Most rests take 10 to 30 minutes. The beta-amylase rest can run 45 to 60 minutes for a very dry beer.

Can I step mash in a cooler?

Yes, with boiling water infusions. Start with a thick mash, use the infusion formula above, and limit yourself to one or two steps.