The Latest Breaking News from Boulder

In the waning days of 2021, a grass fire broke out in Boulder County, Colorado. Fueled by extreme drought and high winds, the fire swept through the communities of Superior and Louisville. Within hours, it had destroyed more than a thousand structures — making the Marshall fire the most destructive…

DENVER — When Boulder psychiatrist Will Van Derveer first heard about people treating severe mental health issues with MDMA — popularly known as the party drug ecstasy, or molly — he was extremely skeptical.

BOULDER, Colorado - El doctor Warren Hern no tiene que imaginar lo que pudiera ocurrir a muchas mujeres en Estados Unidos si la Corte Suprema anula el caso Roe contra Wade.

BOULDER, Colo. — Dr. Warren Hern doesn't have to imagine what could befall many women in America if the Supreme Court strikes down Roe v. Wade.

The city of Boulder has had 18 puma reports in the last six weeks. In winter, the predator follows its prey to lower elevations.  

US scientists have measured Albert Einstein's theory of general relativity -- which holds that gravity slows time down -- at the smallest scale ever, demonstrating that clocks tick at different rates when separated by fractions of a millimeter. Jun Ye, of the National Institute of Standards and Technology (NIST) and…

Nearly a year after 10 people were shot and killed at a supermarket in Colorado, the redesigned store in the college town of Boulder is reopening Wednesday

LOS ANGELES — Federal prosecutors have charged a former UCLA lecturer with making criminal threats across state lines in connection with a video he sent students and faculty referencing a mass shooting, which in turn prompted a campus shutdown.

LOS ANGELES — To his students at UCLA, the warning signs about lecturer Matthew C. Harris seemed abundant and longstanding.