When Someone Else's Negligence, a Landowner or a Defective Machine May Be Responsible Under Colorado Law
If someone else was driving, what a court will look at is whether that person owed you a duty of care, whether they breached it, whether the breach caused your injury, and whether you suffered damages as a result. A driver who carries a passenger, or an owner who lends a machine to a teenager, may owe a duty, but whether it was breached and whether that caused the injury depends on the facts.
If the crash happened on someone else's land, Colorado's recreational-use statute often comes first. Under section 33-41-103 of the Colorado Revised Statutes, and subject to section 33-41-105, an owner who "invites or permits, without charge, any person to use such property for recreational purposes" does not thereby confer "the legal status of an invitee or licensee to whom a duty of care is owed." Section 33-41-104 sets out situations where that protection does not apply, including a "willful or malicious failure to guard or warn against a known dangerous condition," and cases where the owner charges the person for recreational use. Under that same section, money an owner receives for leasing land to a public entity, or from a federal agency for admitting people, is not treated as a charge. So whether your ride on ranch land was free, paid or arranged through a lease can change the analysis.
If the vehicle itself is in question, the claim runs against a manufacturer or seller. What a court will look at is whether the machine had a defect, in its manufacture, its design, or its warnings and instructions, and whether that defect caused your injury. A crash alone does not establish either. The site's page on the CPSC ATV safety standard explains the federal rules that apply to ATVs.
What this means for you: who may be responsible turns on who drove, who owned the land and whether anything was paid, and what the vehicle did. Questions worth asking early include whether a fee or rental agreement existed, and whether the vehicle has been kept as it was after the crash.