KUNC - Commentary Transcript . Right now is mud season, whether you live in the lowlands or the high country. Only in the high country the mud season lasts from now until the snow is gone. Some years that means early June.
Frosts can happen in the high country during every month of the year.
So tender annuals are out. Vibrant perennials and hardy annuals are the way to go. The last average frost in Denver is May 5th. For every 1,000 feet higher your garden is than Denver add a week to the last average frost date. May. A lot of garden centers will be sold out of pansies and snapdragons by then, so plan ahead.