Txs in advance.

Probably. Colorado spruce can be plagued by numerous different tip blights or needlecasts, all fungal in origin. These tend to be more prevalent in locations that are very mild or wet or summer humid. Colorado spruces prefer it hot and dry in summer and cold and snowy in winter. The best control is cultural control but that will be hard to accomplish in an unsuitable climate. You can also prune out the affected tip tissue and there are fungicides registered for these pathogens but they may also discolor the tree or cause it to be more green than blue.

LOL that this plant has managed to captivate people in ANOTHER inappropriate climate for it. (most of populated Japan anyhow...suppose they could do well in Hokkaido, or at high elevation elsewhere) Blue forms of China Fir would be soooo much more satisfying and healthy in Asia...but oh well.