Weather Alerts–Boulder, CO Frost Advisory From Sat 12 am until 9 am MDT Action Recommended Make preparations per the instructions Issued By Denver/Boulder – CO, US, National Weather Service Affected Area Fort Collins, Boulder and the western suburbs of Denver, Denver, Castle Rock, and Southern Lincoln County Description …FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM MDT SATURDAY… WHAT…Temperatures as low as 32 will result in frost formation. WHERE…Fort Collins, Boulder and the western suburbs of Denver, Denver, Castle Rock, and Southern... Read More