Yes. Although Colorado normally charges DUI or DWAI as a misdemeanor, a fourth offense DUI or DWAI is a class 4 felony. Unlike many other states, Colorado does not apply a “lookback period” to determine how many offenses you have committed. The court will even count a 50-year-old conviction against you. Colorado can also charge you with a felony, even for a first-offense DUI or DWAI, if you cause an accident that kills someone else or causes them serious bodily injury. Penalties for a felony DUI can include years in state prison as well as other punishments. The more serious your charge, the more critical it is that you use the help of an experienced Denver DUI lawyer who is committed to protecting your rights.