A yukkuri whose temperature is below normal. They can die from their pastes freezing over.
Non-domesticated yukkuris without a home can get exposed to cold winds during nighttimes, though generally only koyukkuris are weak enough to freeze from cold winds alone. Adult yukkuris generally don't freeze outside of winters
Naturally, yukkuris with cold fillings such as cirno or letty are immune to freezing