Today I’m in Colorado where carrying a 3.50” pocket knife will get you a state felony. We think that’s a small knife in TX.

(However, the scenery is pretty fine here and if you don’t tell ‘em you’re from TX they’re very nice folks!)
So I’m carrying my Chaves 3.25” Liberation.
You made me look this up just now. It's only a class 6 felony if >3.5 inches and carried on school grounds K-12, and universities (private or public).
A “Knife” as defined by
§ 18-12-101 is:
any dagger, dirk, knife, or stiletto with a blade over three and one-half inches in length, or any other dangerous instrument capable of inflicting cutting, stabbing, or tearing wounds, but does not include a hunting or fishing knife carried for sports use. The issue that a knife is a hunting or fishing knife must be raised as an affirmative defense.
Otherwise, it's a class 2 misdemeanor punishable by 3-12 months and/or a fine of $250-1000 if the blade is "over 3.5" AND concealed such that it is not obvious that you are carrying a knife; with the pocket clip showing by itself being up to a jury as to whether it was enough to avoid being concealed (so not recommended).
From AKTI: "concealed” for purposes of section 18-12-105(1)(b) means placed out of sight so as not to be discernible or apparent by ordinary observation."
"Whether a knife is concealed is typically an issue for the jury. This would include a pocket clip carry of a knife with a blade longer than 3 ½ inches. We do not recommend that one rely on [visible] pocket clip carry as being compliant with a concealed carry restriction."
"Additional exceptions which allow concealed carry include at one’s place of business, in a private vehicle, and while hunting or fishing." Hunting or Fishing is an affirmative defense if carried concealed and greater than 3.5" blade.
Basically over 3.5" becomes a "deadly weapon"
Deadly Weapon Defined
“Deadly weapon” is defined by
§ 18-1-901. Definitions as follows:
“Deadly weapon” means:
(I) A firearm, whether loaded or unloaded; or
(II) A knife, bludgeon, or any other weapon, device, instrument, material, or substance, whether animate or inanimate, that, in the manner it is used or intended to be used, is capable of producing death or serious bodily injury.
Denver and Boulder may have additional ordinance restrictions that I didn't find details in my first search. But even in areas with an ordinance against certain deadly weapons, they can be carried in your vehicle while traveling.
"Colorado law, § 18-12-105.6. Limitation on local ordinances regarding firearms in private vehicles provides that a weapon used for hunting or lawful protection may be carried in a vehicle statewide without violating inconsistent local ordinances. “Stops” are permitted."
But if carried on school grounds, then a blade greater than 3.5" becomes a class 6 felony to "carry" it, whether carried openly or concealed (12-18 mo sentence), unless it remains in a locked vehicle, or one is a law enforcement officer or school resource officer.
Typically, for us living here, the police are not pocket checking people for blade length, unless the person is doing or has some something else nefarious, where they are charged with another offense in addition to the knife.
I also have not heard of an instance where a person with a "concealed firearm permit" has been charged for concealing a blade longer than 3.5", even though the permit is not named a "concealed weapon permit" which would be more all-encompassing.
Note -
possession of a ballistic knife is a class 5 felony, conceled or not.