Snow blankets south of Castle Rock, Monument Hill roads turn sloppy

Snow loaded the higher terrain south of Castle Rock and turned Monument Hill sloppy, with the heaviest accumulation falling well away from the Denver metro core. The National Weather Service logged 6.0 inches at a CoCoRaHS station 2.6 miles west of Roxborough Park in Douglas County, while nearby foothill locations picked up 5.2 inches at Conifer and 5.0 inches at Evergreen.

That placement mattered for drivers. The snow fell where many Douglas County commuters and regional travelers hit steeper grades and faster-moving traffic, including the I-25 corridor between Castle Rock and Monument. On a day when grass and trees were blanketed south of Castle Rock, pavement on Monument Hill became the part of the route most likely to slow school runs, work commutes and trips across the county line.

The metro area saw a lighter hit. BoulderCAST’s storm summary showed 3.4 inches in Denver and 1.7 inches in Boulder from the April 17 storm, and its seasonal tracker put Denver at 27.3 inches and Boulder at 30.1 inches as of April 18. Denver International Airport recorded only half an inch, a sharp contrast with the foothills south and west of Castle Rock, where late-season snow built up fast enough to make the road surface sloppy.

Denver7 described the event as one where April showers came in the form of snow after one of the warmest, driest winters on record, with some parts of Colorado seeing up to six inches. That kind of spring swing is part of what makes Douglas County travel so vulnerable: a light-looking storm in the metro can still leave Monument Hill and the surrounding foothills with winter driving conditions. Denver7 has also pointed to an April 2019 blizzard that produced winter driving conditions on I-25 between Castle Rock and Monument, a reminder that late April can still hit the Front Range with road-closing weather when it matters most.