How does Shatter proc?

I recently started a mage and I was wondering about shatter procs. Say a target is frozen and I use frostbolt on him, does the proc count if the target is frozen when the spell hits, when the spell is cast, when the spell is launched or a mix of those?
damage is calculated when it leaves the player character. so if you frostbolt a frozen target and immediately follow it up with an ice lance the ice lance will get the frozen bonus assuming that the frostbolt is still in mid air and hasn't broke the nova

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