Question Seasonal changes like snow on terrain

Hey everyone!

At the moment, I'm working on a seasonal system that changes the world around the player.
However, I'm having trouble with the terrain itself..
Snow can already form on assets, I made a shadergraph for this.

The terrain in unity itself is a bit more difficult since it already has a shader, and I'm not sure how I would go about this.

Would it be better to just create a terrain in blender/Maya so I can make shaders for it?

Would love to know what you all think about this or have different opinions!