Winter weather has returned to Colorado, just a day before summer officially begins.
National Weather Service meteorologist Jim Kalina in Boulder says several inches of snow have fallen in Colorado's high country.
The Denver Post reports that snow closed Trail Ridge Road overnight in Rocky Mountain National Park. The road was reopened shortly after noon Monday and was crowded with riders on the bicycle tour of Colorado.
Park officials say some riders had to be treated for mild hypothermia.
Up to 5 inches of snow fell in some of the central- Colorado mountains. Interstate 70 at the Eisenhower Tunnel west of Denver was wet and snowy at times.
Campers are being warned to be prepared for unseasonably cold conditions to prevent hypothermia and frostbite.