What type of cloud produces freezing rain?

Answer 1

Freezing rain can come from Cumulonimbus and Nimbostratus clouds, but the clouds are not responsible for the freezing rain.

If the precipitation falls from the clouds as snow it must pass through a warm layer of air to melt the snow flakes into rain drops.

Then the raindrops must pass through a frigid layer of air that super-cools them.

Finally, the rain instantly turns to ice if it lands on a surface that has a temperature below freezing.

Then you know you have freezing rain.

(see Related Link below for more detail on freezing rain.)

Answer 2

Stratus clouds are commonly associated with freezing rain. When warm air aloft overrides a layer of cold air near the surface, precipitation falls as rain but freezes upon contact with the surface, leading to freezing rain.