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For the BTD5 counterpart, see Deep Freeze (BTD5).
Freezes through 2 layers of Bloon.
~ In-game Description

Deep Freeze is the second upgrade of Path 2 for the Ice Monkey in BTD6. Deep Freeze can now freeze up to 2 layers instead of 1. It still deals 1 damage, but the freeze effect can penetrate up to 2 bloon layers. Note that freezing is applied after damage.

It costs $295 on Easy, $350 on Medium, $380 on Hard, and $420 on Impoppable.



Deep Freeze is limited in its practical role, as most of the time when this upgrade is needed is when there are other attacks that would naturally defrost the ice too soon. This is especially the case when paired with Mortar Monkeys and Bomb Shooters, especially Mortar's Burny Stuff.


  • 0-2-2 Ice Monkeys (Deep Freeze + Refreeze) nearby each other can be used to continuously pop down masses of bloons. However, its previous Enhanced Freeze upgrade is sufficient for this purpose unless when paired with other towers.
  • Pair this with an explosive tower such as Mortar Monkey or Bomb Shooter to make the most of this upgrade.
  • Unless there are other non-Ice towers around, Deep Freeze is useless.
  • There appears to be more value with adding Deep Freeze to Ice Shards, as it apparently allows shard generation to pass onto bloon offspring too.


Official artwork[]


  • Deep Freeze adds a red beanie to the Ice Monkey.
  • Path 2 upgrade portraits all have clothing that humans would need to combat the cold, which is ironic for the Ice Monkey who is all about the cold.