This is a paid asset, but now you can download WinterZone-Mountains Free.
Detail this asset from Unity Store: Original Link
WinterZone-Mountains v1.0
Pack contains 48 prefabs:
6 far mountains as mesh – 8k, 16k, 32k, 64k (tris) versions for each,
6 mountains as Unity Terrains – 2k and 4k heightmaps and splatmaps for each,
6 Unity Terrains – 2k and 4k heightmaps and splatmaps for each,
2k textures snow, rock and ice,
10 demo scenes
Details:
6 Mesh Mountains (fbx) (200m x 200m) 8k, 16k, 32k, 64k (tris) versions for each
– diffuse textures 4096×4096
– normalmaps 4096×4096
6 Mountains based on Unity Terrains (500m x 500m)
– 6 heightmaps 2049×2049 and 4097×4097
– 6 splatmaps 2049×2049 and 4097×4097
6 Unity Terrains (500m x 500m)
– 6 heightmaps 2049×2049 and 4097×4097
– 6 splatmaps 2049×2049 and 4097×4097
2k textures
– 8 rock textures,
– 4 snow textures,
– 2 ice textures
10 demo scenes
Blizzard effects, wind sounds, footsteps and more can be found for free here:
Winter Zone Mini