Denver - Hurricane-force winds swept across Colorado on Monday, tipping over tractor-trailers ahead of a cold front expected to bring bone-chilling temperatures.

A wind gust in Golden, just west of Denver, reached 98 mph, while an 88-mph gust was reported outside Boulder. Temperatures plummeted across the northern Rockies. It was 1 degree in Havre, Montana.

At least 10 tractor-trailers were blown over between Fort Collins and Cheyenne, Wyoming, said Stacey Stegman, spokeswoman for the Colorado Department of Transportation.

One rig was knocked over on Interstate 25 in Pueblo and another one at a busy interchange near Denver. No injuries were reported.

The state Highway Department warned vehicles likely to be affected by wind not to use I-25 or U.S. 287 in northern Colorado, where winds of 65 mph were reported.

The wind picked up before dawn and by the morning rush hour was blowing garbage cans down the streets of Denver.

A roofer working in Broomfield, south of Boulder, said he received several phone calls from homeowners returning from work to discover roof damage.

"I went into this one cul-de-sac and there were shingles blown all over the place, all over the street," Matt McKinley said.