Four systems, and Colorado sits in the stricter half of the middle
American fault law splits into four real categories: pure comparative negligence, modified comparative negligence with a 50% bar, modified comparative negligence with a 51% bar, and pure contributory negligence. Colorado uses the 50% bar version — genuinely stricter than the more common 51% bar many other modified comparative states use, though far more forgiving than the five contributory negligence jurisdictions at the opposite extreme.
A genuinely early adopter
What sets Colorado apart from most of its peer states isn't just the threshold — it's the timing. Under C.R.S. § 13-21-111, Colorado codified comparative negligence in 1971, years before most other states moved away from strict contributory negligence, whether by their own statute or by judicial decision. Colorado's approach was already settled law well before California adopted its own pure comparative rule judicially in 1975, for comparison.
Colorado's rule: barred at equal fault
Under Colorado's statute, a claimant recovers nothing once their negligence is equal to or greater than the negligence of the party they're suing. That precise wording means a 50-50 split in fault results in zero recovery under Colorado law, not a reduced one.
The more common alternative: a 51% bar
Many other modified comparative states phrase the same basic threshold slightly differently: recovery is barred only once the claimant's fault exceeds 50%. Under that more common "51% bar" approach, a claimant found exactly 50% at fault can still recover something. Colorado's rule, by denying recovery at fault merely equal to the other party's, sets the bar one point lower and meaningfully stricter.
Pure comparative negligence: the more forgiving alternative
At the more forgiving end of the spectrum, pure comparative negligence states — including nearby Arizona and California — never bar recovery for ordinary fault at all, no matter how high the claimant's percentage climbs. Colorado's approach produces a very different outcome the moment fault reaches the 50% mark.
Contributory negligence: the strictest extreme
At the far other end sit the five contributory negligence jurisdictions — Alabama, Maryland, North Carolina, Virginia, and the District of Columbia — where any fault at all on the claimant's part, even 1%, bars recovery entirely. See our guide to the other states using a 50% bar for Colorado's closest peer group nationally.