Board Thread:Dragon City Questions and Answers/@comment-41.37.29.137-20130427121610/@comment-93.109.162.10-20130502180909

You can't breed fire-ice directly,so at least one has to be a hybrid. Basically what I think is best is to breed fire hybrid with normal ice (or normal fire with hybrid ice). This gives you higher chances of getting the Coolfire.

EG:

Ice Dragon + Medieval / Flaming Rock / Dark Fire / Hot Metal / Laser

or

Fire Dragon + Ice Cream / Alpine / Fluorescent

What I have right now in the breeding area is Hot Metal dragon (fire/electric) with a normal Ice dragon. This will give me either a fire-ice hybrid (Coolfire or Blizzard) or an electric/ice hybrid.