Sites like http://www.knifeup.com/colorado-knife-law/ and others list colorado law pertaining to concealed knives as such:
These knives are illegal to carry concealed:
All knives less than 3.5 inches are legal.
All fishing and hunting knives of any length are legal.
All knives over 3.5 inches are illegal.
So, can I carry a concealed 6 inch filet knife in Colorado? Any help would be appreciated.