So, the short answer is 15 if you take (and pass) driver's ed, or 16 if you do not take driver's ed.
Regardless of your age or the type of instruction permit you have, you must always have a licensed Colorado driver who's at least 21 years old seated next to you whenever you drive.
NOTE: If you are at least 16 but younger than 16½, in addition to the above, you must also complete behind-the-wheel training before obtaining your minor driver license (this is in addition to the 50 hours of driving practice you are required to complete with the person who signed your DR2460 form). This behind-the-wheel training must consist of six (6) hours behind-the-wheel training with an approved driver education instructor. If there is no driver training school within 30 miles of where you live, this training may be completed by spending an additional twelve (12) hours of driving practice time with the person who signed your DR2460 form (for a total of 62 hours of driving practice time).
If you are under the age of 16½, you must also complete an additional six (6) hours of behind-the-wheel training with an approved driver education instructor. If there is no approved driving school located within 30 miles of where you live, you may satisfy this requirement by increasing your required 50-hour driving practice by 12 hours (for a total of 62 driving practice hours).
If you live more than 30 miles from the nearest Colorado driving school, you may elect to fulfill your behind-the-wheel training requirement by adding an additional twelve (12) hours of supervised driving with the person who signed your Affidavit of Liability (Form DR2460), for a total of 62 hours of driving practice.
If you are under 18 and hold a minor driver's license, you may not drive with any non-family passenger under the age of 21 during the first six (6) months after you receive your minor drivers license. During the second six (6) months you may only carry no more than one (1) non-family passenger who's under 21. The exception to the passenger restrictions would be if an adult who's at least 21 years old and has held a valid driver's license for at least one (1) year is seated in the front passenger seat next to you.
These passenger restrictions are lifted starting with the second (2nd) year of having your minor driver license.
After you receive your minor driver's license, if you are under 18 you are not allowed to drive between the hours of 12:00am and 5:00am until you have had your Colorado drivers license for one (1) full year. Exceptions include if your parent/guardian or a licensed adult driver who's at least 21 and has held a driver's license for at least one (1) year is riding with you, or if you are driving to school (and school does not provide transporation) or work. If so,you must carry a written letter signed by your school principal or your employer while you drive.
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