Thank you for your question and pictures. It looks like your Colorado blue spruce is suffering from spruce needle rust. It is caused by a fungus and affects new growth, which turn a yellow, pink color. Here is information about it from Extension:

Spruce needle rust | UMN Extension

From your picture of the entire tree, it looks like your spruce may have Rhizosphaera needle cast disease. This is common in spruce trees as they grow, with the inside needles of trees drop. Unfortunately, this is a tough disease to treat, so many homeowners prune the lower branches of their spruce. 

Rhizosphaera needle cast | UMN Extension