Coroner’s Report on 6 Deaths at Colorado Dairy Points to Toxic Gas Exposure

A sign stands at Prospect Ranch outside of Prospect Valley Dairy east of Keenesburg, Colo., on Aug. 21, 2025. Chris Bolin/Denver Post via AP

Six people who died at a Colorado dairy farm this summer were exposed to hydrogen sulfide gas, authorities said Thursday.

The Weld County coroner’s office drew its conclusions from autopsies and toxicology tests.