Ice crystal formation

Ice crystal formation is how water in a frozen dessert freezes into crystals, and their size decides whether it feels smooth or icy.

Ice crystal formation: A scoop of smooth vanilla ice cream beside a scoop of coarse, icy frozen dessert showing larger crystals
  • Food science and baking chemistry

In frozen desserts, water freezes into ice crystals as the mix gets cold. A large number of small ice crystals gives ice cream its smooth texture.

The crystals do not stay small on their own. They grow larger during storage through recrystallization, which makes the product coarse and icy. Temperature swings, for example from opening the freezer often, speed this up.

Cooks keep the crystals small by freezing the mix quickly while stirring or churning, and by using ingredients that get in the way of crystal growth. Sugar helps prevent grainy crystals in ice cream. Water loss from a frozen dessert can also show up as ice crystals on the surface.

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Sources

Written by VanillaGoods in our own words from these sources. Last reviewed October 15, 2026.

  1. 1.3: Crystallization, LibreTexts Workforce (Modern Pastry and Plated Dessert Techniques)