DENVER, Colo. – The sun will rise over a crisp Front Range sky this morning, signaling a change on the horizon. What feels like a mild fall day Sunday will turn brisk within 48 hours, as cold, dry air sweeps into eastern Colorado early this week. The transition comes just in time for Halloween preparations, with temperatures tumbling toward freezing by Tuesday morning.
According to the National Weather Service in Boulder, highs near 70°F today will give way to the mid-50s by Tuesday. Monday stays sunny but breezy, with south winds gusting up to 25 mph ahead of a colder push from the north. By early Tuesday, lows will dip near 28°F across Denver, Aurora, and Lakewood — enough to bring the season’s first widespread frost. Gardeners and homeowners should cover tender plants and disconnect outdoor hoses.
Travel conditions along I-25 and I-70 will remain clear, though patchy frost could form on windshields before sunrise Tuesday. Rural valleys west of Golden and north toward Fort Collins may see the first subfreezing readings of the season. Halloween night currently looks dry and calm but cool, with temperatures slipping into the 40s during trick-or-treat hours.
For now, skies stay bright and crisp through Thursday, perfect for outdoor cleanup or early decorating before the next front later in the weekend. Early models hint that November may open with a colder pattern and a slight chance for flurries in the foothills — the first sign that winter’s edge is getting close.
Five-Day Forecast for Denver, CO:
Sun: 71/43 – Mostly sunny; light east breeze.
Mon: 67/32 – Breezy south winds; turning cooler.
Tue: 52/28 – Sunny, crisp; first frost possible.
Wed: 58/33 – Bright skies; cold morning start.
Thu: 60/34 – Sunny and mild; calm afternoon.
