Stop fermentation in mead by cold crashing, sulfiting, or stabilizing with potassium sorbate.
Stopping fermentation in mead involves controlling yeast activity to preserve sweetness or prevent over-carbonation. Cold crashing drops temperature to near-freezing, forcing yeast into dormancy. Potassium sorbate inhibits yeast reproduction when added before bottling. Campden tablets (potassium metabisulfite) kill or stun yeast cells. Back-sweetening with honey after stabilization maintains desired sweetness. Each method requires careful timing and sanitation to avoid bottle bombs or spoilage.
Methods to stop fermentation
- Cold crashing: Chill mead to 28-32°F (-2 to 0°C) for 3-7 days to force yeast dormancy
- Potassium sorbate: Add 1/2 tsp per gallon before bottling to prevent yeast reproduction
- Campden tablets: Use 1 tablet per gallon to stun or kill yeast cells
- Filtering: Remove yeast physically using 0.5-1 micron filters
Comparison of stopping methods
| Method | Cost | Duration | Effectiveness |
|---|---|---|---|
| Cold crashing | Low (requires refrigeration) | 3-7 days | Moderate (yeast may restart if warmed) |
| Potassium sorbate | Low ($2-5 per batch) | Immediate | High (prevents reproduction) |
| Campden tablets | Very low ($1-3 per batch) | 24-48 hours | High (kills yeast) |
| Filtering | High (filter equipment needed) | 1-2 hours | Very high (removes yeast) |
Back-sweetening after stabilization
Once fermentation stops, add honey to reach desired sweetness. Use a hydrometer to monitor specific gravity. For a semi-sweet mead, target 1.010-1.015 SG. Add honey in small increments, stirring thoroughly and tasting between additions. Wait 24 hours after stabilization before back-sweetening to ensure potassium sorbate effectiveness.
Preventing bottle bombs
Always confirm fermentation has stopped before bottling. Use a hydrometer to verify stable specific gravity over 3-5 days. If using cold crashing alone, store bottles at serving temperature to prevent dormant yeast from reactivating. For added safety, use pressure-resistant bottles and monitor carbonation levels during bottle conditioning.