The Malting Process
Malting is a series of five interconnected stages that transform raw grain into finished malt. Each stage has a specific purpose, and each stage leaves a mark on the malt that cannot be undone in later steps. Getting the process right means making good decisions at every point — from the moment grain enters the steep tank to the moment finished malt is loaded for shipping.
For Bard's, this process was performed by Missouri Malting & Food in Salina, Kansas under an exclusive toll malting agreement. Bard's supplied grain sorghum; Missouri Malting performed the malting under a confidential and proprietary procedure, then shipped the finished malt to Left Hand Brewing in Colorado for production. The separation between grain sourcing, malting, and brewing was a deliberate supply chain structure.
The Five Stages
| Stage | Duration | Goal | Key Variable |
|---|---|---|---|
| Steeping | 16–24 hours | Raise grain moisture to 42–45% | Temperature, timing |
| Germination | 4–6 days | Develop enzymes, modify endosperm | Temperature (30°C), duration |
| Kilning | 16–24 hours | Stop germination, dry to ≤5% moisture | Temp vs flavor/enzyme tradeoff |
| Roasting (optional) | Variable | Develop color and specialty flavor | High heat, target color (EBC) |
| Cooling & Stabilization | Hours | Equilibrate moisture, stabilize for storage | Moisture uniformity |
Steeping — Dry grain is hydrated over approximately 16-24 hours to raise moisture from around 12-14% to approximately 42-45%. This triggers germination. Everything that follows depends on the grain being properly steeped.
Germination — The hydrated grain is held at controlled temperature (25-30°C) for 4-6 days while enzymes develop. Alpha-amylase and beta-amylase are built up during this phase. The grain sprouts visibly — rootlets and the acrospire (the emerging shoot) grow during germination.
Kilning — Green malt (germinated but undried) is dried in a kiln to stop germination and reduce moisture to storage levels (≤5%). Temperature and time determine how much enzymatic activity is preserved and what flavor character the malt develops.
Roasting — An optional additional processing step. High-temperature kiln treatment produces colored specialty malt for use in limited-release or specialty products. Maillard reactions and caramelization create color and flavor compounds not achievable through standard kilning. For Bard's, roasting was an exclusive capability of Missouri Malting under contract.
Cooling and Stabilization — After kilning or roasting, malt is cooled to ambient temperature and equilibrated to a stable moisture level before storage or shipping. Premature storage of hot or uncooled malt causes condensation, moisture uptake, and quality degradation.
What This Section Covers
- Steeping — hydration, timing, sorghum-specific challenges, grain quality prerequisites
- Germination — enzyme development, temperature and duration parameters, batch efficiency
- Kilning — drying, flavor development, enzyme preservation decisions
- Roasting — specialty malt production, how roasting differs from kilning
- Cooling and Stabilization — post-processing handling, moisture targets, storage readiness
Core Principle
A decision made at steeping cannot be corrected at germination. A decision made at kilning cannot be corrected in the mash tun. The malting process is sequential and non-reversible. Quality is built in order — or it is not built at all.