Actually, Colorado does not allow any non-zoo-or-rescue-type place to keep hots. There was a big issue earlier this year when some lady was found with about 25 different venomous snakes...
The exception to this is gila monsters and beaded lizards. They're perfectly legal as far as I can tell.
The other thing which isn't allowed in Colorado: buying/selling native species (though there are actually permits for this that you can get, I'm told), even captive-bred non-wildtype versions. There's concern about them escaping and contaminating the wild populations with disease, so they keep a closer eye on it.
Beyond that, if you live in the county, you can keep just about any nonvenomous snake, and pretty much any lizard. (I never checked to see if komodo dragons were on the 'no' list, though...)
Here's the section pertaining to reptiles for Colorado Springs (and the rest of El Paso County):
5. Any other domesticated animal kept as a pet (i.e., for pleasure rather than utility, sale or food) may be allowed on residential property, provided:
a. No more than two (2) of any such animals (other than fish, small reptiles or amphibians, small rodents or small birds kept in the dwelling) are located on any property;
b. The animal does not exceed one hundred (100) pounds in weight;
c. The animal is thoroughly secured on the property;
d. The animal produces no sounds or smell that may be reasonably regarded as offensive;
e. The animal is not exotic, wild or ordinarily considered dangerous; and
f. The animal is properly maintained to remain healthy and to prevent the accumulation of wastes.
Aaanyway... if you're dealing with larger reptiles that don't reach 100lbs, I'm pretty sure you can keep/breed those in areas zoned for 'hobby farms' as best I can tell. Anyone that wants to dig through it can read the zoning restrictions here:
Zoning Regulations for Colorado Springs and El Paso County
For regulations on the entire state, you need to check out the Colorado Department of Wildlife's webpage... somewhere they have a PDF which states what reptile species are allowed.
-Kat Hall