It could be rain or snow depending on where you live.
One thing you can be sure of? The roads will be better no matter where you are – and the reason will feel very un-May-like.
9NEWS Reporter Colleen Ferreira was in the south part of the Denver metro area, where rain has already made the switch to snow.
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Viewer photos of Colorado's May storm
You can watch her live looks at road conditions from our newscasts below:
As for 9NEWS Mountain Newsroom Reporter Matt Renoux, he was at the Eisenhower Tunnel, where snow coated the roads.
Interstate 70 was closed in the area for a while Thursday morning due to a wreck, but has since reopened.
Eastbound I-70 is closed at Vail due to multiple spun-out vehicles. There's no estimated time for reopening. The Colorado Department of Transportation says to expect delays.
US 6 is also closed at Loveland Pass due to a wreck involving a tanker truck.
Watch Matt's look at the conditions below:
And Photojournalist Byron Reed drove a stretch of Interstate 25 for a look at road conditions: