Most brewing yeast is pampered. It is grown in labs, pitched in carefully counted doses and kept at a polite 18–20 °C. Then there is kveik: a family of Norwegian farmhouse yeasts that has been passed from farm to farm for generations, dried on wooden sticks, pitched at “milk-warm” temperatures and expected to finish a batch of beer in a couple of days. When it reached the wider brewing world in the 2010s, it rewrote a few rules.
What Is Kveik?
In the dialect of western Norway, kveik simply means yeast. Writer and researcher Lars Marius Garshol, who began documenting these farmhouse traditions in the 2010s, stresses that kveik is a type of yeast rather than one strain. Each farm culture is traditionally a blend of several related strains, named after the farm, family or district that kept it — Voss, Hornindal, Sigmund and many more.
These cultures survived in isolated valleys where home brewing stayed a household skill long after most of Europe had switched to commercial yeast.
What the Science Says
In 2018, Richard Preiss, Garshol and colleagues published the first detailed genetic study of kveik in Frontiers in Microbiology. Their key findings:
- Kveik forms its own distinct group within the domesticated “Beer 1” family of brewing yeasts, with signs of a mixed ancestry
- Most of the strains tested could grow at 40 °C, and many at 42 °C
- Many tolerated high alcohol levels in the lab
- The main kveik group was POF-negative, meaning it does not make the clove-like phenols of German wheat or Belgian yeasts
- The authors note that kveik has traditionally been stored dry for a year or more between brews
Farmhouse Traditions
Garshol’s writing for Craft Beer & Brewing describes kornøl, the raw ale of the Hornindal area. Brewers steep juniper branches in hot water, mash with that infusion, and often run the wort straight into the fermenter without a boil. Once it cools to roughly body temperature, the kveik goes in — traditionally accompanied by a loud shout, the gjærkauk, said to scare off any spirits that might spoil the beer. Fermentation can be done in about two days.
Between brews, yeast was dried on carved wooden sticks, logs or twisted rings and hung up until the next brew day.
Kveik vs Regular Ale Yeast
| Typical Ale Yeast | Kveik | |
|---|---|---|
| Fermentation temperature | ~18–22 °C | ~30–40 °C, strain-dependent |
| Pitch rate | Carefully measured, generous | Tiny — a teaspoon of slurry per ~25 L |
| Time to finish | 1–2 weeks | Often 2–3 days |
| Temperature control | Usually essential | Keep it warm, not cool |
| Phenols (clove) | Varies | Main group POF-negative |
| Typical aromas | Clean to fruity | Orange peel, tropical fruit, caramel, varies by culture |
Brewing with Kveik at Home
Garshol’s practical advice on his blog runs against a lot of modern habits:
- Pitch warm. Many cultures do best in the low-to-mid 30s °C; check the specific strain’s recommendation.
- Underpitch. He suggests about a teaspoon of slurry for 25 litres; small pitches tend to give more flavour.
- Aerate simply. Pouring the cooled wort with a good splash is usually enough.
- Keep it cosy. Wrap the fermenter or place it somewhere warm so it doesn’t cool too much.
- Expect speed. Activity can start within an hour, and a finished fermentation inside about 36 hours is normal.
- Check before you package. Fast doesn’t mean guaranteed finished — confirm stable gravity readings before bottling.
Kveik is a gift for summer brewing and for anyone without temperature control. Dried cultures can also be stored for long periods, which is how the farm cultures survived in the first place.
Farmhouse Yeasts Beyond Norway
Kveik is the famous one, but it isn’t alone:
- Lithuania — farmhouse brewers make raw ales (kaimiškas) and oven-baked-mash beers (keptinis) with their own house yeasts
- Latvia and Russia — Garshol’s sampling found living farmhouse cultures in rural Latvia and in the Chuvash region of Russia, and they turned out to be genetically diverse
- Finland — sahti, the Finnish rye-and-juniper farmhouse ale, is widely fermented with baker’s yeast today
- Belgium and France — “saison” and farmhouse ale yeasts come from a separate tradition; today they are sold commercially and prized for bone-dry finishes
A Warning About Some Saison Yeasts
Some saison and Belgian strains carry the STA1 gene, which lets them make an enzyme that breaks down dextrins and even starch — sugars ordinary yeast leaves alone. Wyeast lists several of its Belgian and saison strains as STA1-positive, and notes that those with a fully functional version of the gene reach especially high attenuation.
Why it matters for homebrewers:
- These “diastatic” strains can keep fermenting in the bottle, creating over-carbonation and bottle bombs
- They can linger on equipment and turn your next batch drier and fizzier than intended
- Wait for truly stable gravity, use sturdy bottles, clean thoroughly, and consider dedicated plastic parts
Safety and Legal Notes
Warm, fast fermentations are still fermentations: sanitise everything after the boil, and don’t seal bottles until the beer is finished. Check your local homebrewing laws, and remember — never distill at home.
Key Takeaways
- Kveik is a family of Norwegian farmhouse yeasts, not a single strain
- It ferments hot and fast, with small pitches and little fuss
- Farmhouse yeast traditions also survive in the Baltics, Russia and Finland
- Some saison yeasts are diastatic — great for dryness, risky for bottle pressure