The average last frost date in Colorado Springs is May 15th. That means we might see five years with no frost after May Day, another year with the last frost on Cinqo de Mayo, and then — whoops, look out — a frost on the last day before June.
Many “old timers” never would plant annuals outdoors until after that first weenie roast over Memorial Day weekend.
I’ve even heard tell of a Mother’s Day blizzard.
So hold on to your posies and tomatoes. Even if the frosts are over, the ground is cold and the nights are chilly. One colloquial favorite of mine: Put out tender plants when the new oak leaves are the size of a squirrel’s ear.