Talk:Mods 2.0/@comment-8140201-20130413041427/@comment-7700557-20130413081158

According to the info here, Frost damage mods are dropped more often by Infested. I'd suggest an infested Defense mission, since you'll get a lot of enemies and you won't even have to go looking for them. Since Chilling Grasp is uncommon, I'd suggest a mid- to high-level mission to heighten the chances of it dropping.

Happy hunting!