From WoWWiki
Arctic Reach is a mage talent that increases the range of Frost spells by 10% per rank, up to 20% at max rank 2. This affects the spells Frostbolt, Blizzard, Cone of Cold, Frost Nova, Ice Lance and Deep Freeze. For the direct damage, single target spells Frostbolt and Ice Lance, the projectile range is increased. For the point-blank area of effect spells Frost Nova and Cone of Cold, the radius of the area of effect is extended. For Blizzard, which is ground-targeted area of effect, the radius is not effected, instead the range at which the mage can target a ground area is extended. This talent is useful in nearly every Frost spec that uses these spells frequently.
