Denver International is preparing for 5 to 8 inches of snow and reports 26 flight cancellations, it said.
CNN: Old Man Winter refuses to die as parts of U.S. face blizzard
The Crimea Pass was said to be blocked by snow with reports of many vehicles running into problems.
And there have also been reports of snow on high ground in Powys overnight.
There are reports of snow in all counties of Northern Ireland and delays on a number of roads.
West and north Wales have been particularly affected by snow on Tuesday with reports of up to 3ins (7.6cm) deep in Bala and heavy snowfall in north Anglesey.
Strong winds also did damage in Colorado, the Associated Press reported, where a quick-moving winter storm brought up to a foot of snow in some spots and scattered reports of damage.
In the Staffordshire Moorlands, there were reports of drivers getting trapped in snow drifts of up to 4ft (1m) and snow affecting traffic in Leek.
Pakistan's meteorological department chief, Qamar-uz-Zaman Chaudhry, said some parts of the country had received the heaviest rain and snow in seven years, the Associated Press news agency reports.
Snow-forecast's co-founder, Nick Russill, says the company provides three reports for each ski resort, one for the summit, one for mid-slope, and one for the village.
Mr Snow has covered a variety of momentous stories around the globe for ITN, including the Falklands reports war, the American Shuttle disaster and President Nelson Mandela's release from prison.
There were reports of hazardous driving conditions on A5 near Lichfield, and the A53 in Leek because of ice and snow.
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