Colorado Allows You to Decline Uninsured Motorist Coverage
You are adding a second or third vehicle to your Colorado auto policy and the carrier asks whether you want uninsured motorist coverage. You assumed it was mandatory — liability is required, so UM must be too. It is not. Colorado law requires only $25,000 per person and $50,000 per accident in bodily injury liability, plus $15,000 in property damage liability. Uninsured motorist coverage is optional, and carriers must offer it, but you can decline it in writing.
That optionality creates a structural decision most multi-car households do not anticipate: accepting or rejecting UM coverage applies to every vehicle on the policy, not vehicle by vehicle. If you decline UM when adding the third car, you decline it for all three. If you accepted it when you bought the first car and now reject it on the second, the rejection overrides the earlier acceptance. The policy-level nature of UM is the structural reality this article clarifies.
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Get Your Free QuoteColorado Uninsured Motorist Rate
19.7%
Nearly one in five Colorado drivers operates without insurance. That rate is among the highest in the region and means a household insuring multiple vehicles faces material collision risk from drivers who cannot pay a claim.
Insurance Research Council, 2023
Uninsured Motorist Coverage Pays When the At-Fault Driver Cannot
Uninsured motorist coverage steps in when another driver causes an accident and either carries no insurance or carries limits too low to cover your damages. Colorado's minimum liability limits are $25,000 per person for bodily injury — a single emergency-room visit after a serious collision can exceed that. Without UM coverage on your own policy, you pay the remaining $15,000 out of pocket.
UM coverage has two components: uninsured motorist bodily injury (UMBI) and uninsured motorist property damage (UMPD). UMBI covers medical expenses, lost wages, and pain and suffering when the at-fault driver is uninsured or underinsured. UMPD covers vehicle repair costs under the same conditions. Colorado carriers typically offer both, but you can decline one or both. The decision you make applies to every vehicle on your policy.
Underinsured motorist coverage (UIM) is bundled with UM in most Colorado policies. UIM activates when the at-fault driver carries insurance but their limits fall short of your damages. Declining UM typically means declining UIM as well.
Declining UM on one vehicle declines it for every car on the policy. You cannot mix UM and non-UM vehicles on the same policy.
How UM Coverage Works Across Multiple Vehicles
The first claim might exhaust the limit entirely, leaving nothing for the second.
This structure is identical to how liability coverage works: the limit is per occurrence, not per vehicle. The multi-car discount reduces your premium, but it does not multiply your UM limits. Households that assume each car carries its own UM envelope discover the policy-level cap only at claim time. Carriers do not automatically increase UM limits when you add a vehicle — you must request higher limits if the household's exposure has grown.
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Rejecting UM Coverage Requires a Signed Waiver
Colorado law requires carriers to offer UM coverage at limits equal to your liability limits unless you reject it in writing. You can select lower UM limits, but the carrier cannot sell you a policy without UM unless you sign a rejection form. That form is binding: once signed, UM coverage is removed from the entire policy.
When you add a vehicle mid-term, the carrier will ask whether you want to maintain your existing UM election or change it. If you originally accepted UM and now decline it, the declination applies retroactively to every vehicle on the policy from the date you sign the waiver. If you accepted UM on the first car and the second car is added without revisiting the question, your existing UM coverage extends to the second car automatically at the same limits.
Changing your UM election mid-term re-rates the policy. Adding UM coverage increases the premium; removing it decreases the premium. The adjustment is prorated to the remaining term. If you add UM coverage three months into a six-month term, you pay half the annual UM premium increase at the next billing cycle. Removing UM mid-term generates a prorated refund, but that refund is often applied as a credit to the next renewal rather than issued immediately.
Colorado Minimum Liability Limits
$25,000 / $50,000
Colorado requires $25,000 per person and $50,000 per accident in bodily injury liability. A driver carrying only the minimum leaves a household with serious injuries exposed to five-figure out-of-pocket costs if UM coverage is absent.
Colorado Revised Statutes 10-4-620
Stacking UM Limits Across Vehicles
Colorado allows UM stacking in limited circumstances. Stacking means combining the UM limits from multiple vehicles on the same policy to cover a single accident. Colorado law permits stacking only if the policy explicitly includes a stacking provision — it is not automatic.
Most Colorado carriers do not offer stacking by default. Policies are written with a single per-occurrence UM limit that applies regardless of how many vehicles are insured. If you want stacking, you must request it at the time you bind the policy or add it by endorsement. Stacking increases the premium because it increases the carrier's maximum exposure per claim. Not all carriers offer stacking at any price — some exclude it entirely in their Colorado filings.
If your household owns multiple vehicles and you want stacking, confirm the policy includes it in writing before you bind. The declarations page should state whether UM limits are stacked or non-stacked. If the policy is silent, assume non-stacked. Discovering a non-stacked policy at claim time means you cannot access the combined limits you assumed you had.
Comparing Carriers That Write UM Coverage in Colorado
Every carrier licensed to write auto insurance in Colorado must offer UM coverage, but the terms, limits, and stacking options vary. Not all offer stacking. Progressive and Geico typically exclude stacking in their standard policies; State Farm and USAA offer it by endorsement in most cases. Confirm stacking availability with the carrier before binding if your household needs it.
UM premium varies by carrier, vehicle count, and the limits you select. The UM premium is a separate line item on the declarations page. Compare it across carriers when quoting multi-vehicle policies — the UM cost difference can exceed the base premium difference.
Decide Whether Your Household Needs UM Coverage
A household insuring multiple vehicles in Colorado faces higher collision exposure than a single-car household simply because more vehicles are on the road more hours per day. If one in five Colorado drivers is uninsured, the probability that one of your household's vehicles is hit by an uninsured driver over a five-year period is material. UM coverage converts that risk into a known premium cost.
Declining UM coverage makes sense when every household member carries health insurance that covers auto-accident injuries with low out-of-pocket maximums, the household has sufficient liquid assets to self-insure a $50,000 injury, and the vehicles are older with low replacement value. Accepting UM coverage makes sense when medical coverage has high deductibles, the household cannot absorb a five-figure uninsured-driver loss, or the vehicles are financed and the lender requires UM as a condition of the loan. Compare UM premium quotes from carriers writing your household's vehicles and decide whether the annual cost justifies the protection.