The high-country foliage color show is mostly over, but there’s still color on the Front Range. Take in the many shades of golden leaves on honeylocusts, elms and cottonwoods, the bright red of maples and purple ash, crabapples and ornamental pear trees. Shrubs such as chokecherries, currants and serviceberries are pulling their weight for the fall show, too. Trees Time to recall from grade-school days the science behind leaves changing color each fall.