Colorado teacher license renewal requirements in plain numbers
Colorado runs a 7-year cycle for the professional teacher license. Over those 7 years you need 6 semester hours or 90 clock hours of professional development. You can mix them: 3 semester hours plus 45 clock hours meets the rule, because CDE converts 1 semester hour to 15 clock hours.
The law behind the number is C.R.S. 22-60.5-110. It also limits what the state may ask: no more than six credit hours or ninety clock hours per license term. If a page or a provider tells you that you need more than that for a standard professional renewal, check with CDE.
CDE also lists English learner professional learning for teachers who hold an elementary, English, math, science or social studies endorsement. Check your own license record in COOL, the CDE online licensing system, to see whether that applies to you before you plan your hours.