Frost Advisory issued October 03 at 4:13AM MDT until October 03 at 9:00AM MDT by NWS

…AREAS OF FROST EXPECTED THROUGH EARLY THIS MORNING… .Partial clearing from North Denver and up to the Wyoming border will allow temperatures to drop enough for frost to develop. The frost will be most likely in Boulder, Larimer and Weld counties, but colder spots around Denver and across the rest of northeastern Colorado may also have some frost. A hard freeze is not expected,
Source: New feed