six weeks out

you heard me! don't put those frost sensitive plants in the ground until that first FULL week of june. 
here is a link for an interactive average last frost date map for colorado. for once, i have found a true to the year frost date planner. 
the farmer's almanac still says may 15th. if you want everything to die a miserable black death, then listen to them, otherwise, first full week of june. 
then corn, beans etc get directly sown anywhere from the 10th-17th of june. 
just for good measure, here is a USDA zone hardiness map for colorado.