Associated Press

When a 91-pound mountain lion exploded from its crouched position under a trailer and launched at Larimer County sheriff's deputy Michelle Ross, she had a split second to fire a shot before the animal ripped into her right arm and tackled her to the ground.

Prosecutors will not pursue the death penalty against the older of the two teens charged in a shooting at a suburban Denver school that killed a student.

In a court filing on Thursday, 18th Judicial District Attorney George Brauchler did not explain the decision not to seek capital punishment for the 19-year-old defendant. Brauchler said that the parents of Kendrick Castillo, who was killed in the May 7, 2019, shooting, supported capital punishment.

Senate leaders and the Trump administration have reached an election-year deal to double spending on a popular conservation program and devote more than a $1 billion a year to clear a growing maintenance backlog at national parks.

The number of skiers and subsequent crowds at Arapahoe Basin Ski Area in Colorado has declined since last ski season, a report said.

Chief Operating Officer Alan Henceroth said the ski area had plans to decrease crowds after leaving its partnership with Epic Pass at the end of the 2018-2019 season, Summit Daily News reported Tuesday.

The Durango & Silverton Narrow Gauge Railroad has debuted its first locomotive that runs on oil, a more environmentally friendly fuel source that holds less fire risk than a traditional coal-burning engine.

For the past two years, the D&SNG's crews have worked to convert the No. 493, an early 1900s coal-burning locomotive, to be able to run off oil. It's the first of what's expected to be several conversions from coal-fired to oil-burning engines, as the city's top tourist attraction braces itself for the future.

Thousands of 17-year-olds are eligible to vote in Colorado's upcoming presidential primary for the first time under a new state law.

The law allows 17-year-olds to cast ballots in spring primaries if they turn 18 before November's general election. At least seven states and Washington, D.C., have similar laws.

An elections clerk in a western Colorado county found nearly 600 ballots for the November 2019 election that went uncollected — and uncounted, she reported this week.

"This is a very serious offense and I wanted to let people know," Mesa County Clerk and Recorder Tina Peters told The Daily Sentinel.

President Donald Trump said Tuesday that he's ready to use his "big voice" to bolster Republicans' 2020 campaign hopes as he heads west for a four-day visit mixing policy and politics.

Portions of Interstate 70 through Colorado's mountains were shut down Friday because of heavy snow and avalanche control work as a winter storm hit the Rockies.

A stretch of I-70 from the Denver area to the Eisenhower Tunnel was closed, cutting off access to the mountains. Despite all the fresh powder, Loveland Ski Area closed for the day because strong winds.

Harmful emissions from the agriculture sector are increasingly scrutinized as the climate changes. Now, energy companies want to help dairy farmers reduce emissions.

Virginia-based Dominion Energy and Vanguard Renewables Ag of Massachusetts have announced a $200 million partnership to convert methane from cow manure into renewable natural gas.