Find a location with deep, packable snow and safe conditions
Gather tools such as a snow saw, shovel, and gloves
Pack the snow into a firm mound or use existing hard snow
Shape the mound into a dome or oval
Cut snow blocks if the snow is suitable
Build the walls in a spiral pattern, angling blocks slightly inward
Fill gaps between blocks with loose snow
Carve a small entrance lower than the main floor
Cut a doorway and leave a short tunnel if possible
Make a vent hole near the top for airflow
Smooth the inside walls carefully
Reinforce weak spots with extra snow
Let the structure settle and harden before use
Keep the entrance partially blocked to retain warmth
Avoid making the igloo too large without support
Check for cracks and repair them with packed snow