What temperature do MELT Calcium Chloride Crystals melt to? Your MELT Calcium Chloride Crystals are effective to -25°F (-31°C). Related articles Snow Joe MELT20PET Pet-Safer Blend Premium Ice Melt | 20-Lbs. Are there safety warnings for using this product? What are the active ingredients in MELT Calcium Chloride Crystals? Snow Joe MELT40ESB Calcium Chloride Blend Ice Melt | 40-Lbs. | Works to -15°F 24VBAT-XR8 and 24VBAT-XR12 Charger Compatibility