Colorado Overdose Deaths Climbed to 1,554 in 2025 as U.S. Rate Fell

Colorado recorded 1,554 unintentional drug overdose deaths in 2025, up from 1,409 the year before and nearly double the 884 deaths logged in 2019, according to annual mortality data released by state health officials this week. The increase came as the nation's age-adjusted death rate fell to an all-time low, making Colorado a conspicuous outlier in the country's improving public health picture.

The state Department of Public Health and Environment data, reported by The Denver Post, shows that while Colorado's overall death rate improved after adjusting for population growth and aging, it remains above pre-pandemic levels — driven by three persistent threats: fatal drug overdoses among working-age adults, traffic deaths among the young, and a striking rise in malnutrition deaths among the very old.

Working-age adults bear the overdose burden

Roughly 86 percent of last year's unintentional overdose deaths involved adults of working age, and overdoses were the leading cause of death for Coloradans between 25 and 44. About three-quarters of all fatal overdoses involved fentanyl, and more than half involved methamphetamine or other stimulants — in some cases taken together deliberately, in others consumed unknowingly in contaminated doses.

The pattern diverges sharply from national trends. Fatal overdoses dropped across the United States in 2024, but Colorado and several neighboring Southwestern states saw a partial rebound last year. For three months in spring 2025, Denver alone averaged two overdose deaths per day.

Public health officials in Denver have pointed to a shift in the drug supply as a possible driver, with fentanyl powder displacing the counterfeit pills that had dominated the market in prior years. Harm reduction advocates raised a separate concern: that enforcement actions may have pushed people toward unfamiliar suppliers at precisely the moment the supply was changing.

The supply has become impossible to read

Lisa Raville, executive director of the Harm Reduction Action Center in Denver, said the unpredictability of street drugs has outpaced people's ability to protect themselves. She cited a Los Angeles study that found a single one-gram dose could contain anywhere from one milligram to 650 milligrams of fentanyl — a range that makes any estimate of a tolerable amount meaningless.

"It's really the supply and using alone," Raville said of what is killing people.

There are tentative signs of stabilization. Denver is reporting roughly 40 overdoses per month so far this year, in line with trends since 2021. Raville expressed hope that newly deployed drug-checking machines at Denver harm reduction organizations, which can flag unexpected chemicals in a sample, will help push deaths down again — though she cautioned that such tools have limits when potency varies so wildly.

The persistence of fentanyl in Colorado's supply extends a pattern the state has struggled to break. Colorado's fentanyl deaths rose about 10 percent even as national overdoses declined, a divergence documented earlier this year when DEA seizure data showed the state's unique exposure as a Mountain West distribution hub.

A rare bright spot among the young

One demographic defied the trend: overdose deaths among teens and young adults stayed flat, with 74 people between 15 and 24 dying of accidental overdoses in both 2019 and 2025. Raville credited years of awareness campaigns about counterfeit pills, school-based education on overdose response, and parents who now pack naloxone kits for college-bound children.

"Folks are doing a much better job raising awareness," she said.

Surveys suggest the average teenager is also trying substances later than previous generations did. But the same protective measures have not reached working-age adults, who Raville noted are more likely to use illicit drugs to manage pain or stave off withdrawal than to experiment — and who often carry health conditions that compound the cardiac strain of drug effects and summer heat.

Overdose deaths also rose among older Coloradans, though in small numbers: 21 people between 75 and 84 died of overdoses last year, up from just three in 2019.

Broader mortality picture remains uneven

Colorado's adjusted death rate has fallen since 2019 for seven of the ten leading causes of death, including cancer, heart disease, stroke, Alzheimer's disease, suicide and diabetes. The exceptions — overdoses, other accidents and liver disease — kept the state's overall mortality elevated even as the nation as a whole, per provisional CDC data, recorded its lowest age-adjusted death rate on record in 2025.

Traffic deaths told their own troubling story, with 161 people under 25 killed in vehicle accidents last year, up from 129 in 2019. And deaths from malnutrition among residents 85 and older rose more than 50 percent from pre-pandemic levels, making it the seventh-leading cause of death in that age group.

Whether 2026 brings relief will depend in part on forces beyond any single agency's control — the composition of the illicit supply, the reach of harm reduction services, and the pace at which people at risk connect with treatment. For now, the new data offers a reminder that the national recovery from the overdose crisis is arriving unevenly, and that in states like Colorado, the deadliest years are not yet fully in the past.