Run a soil test. Information about soil testing is available from your county office of Colorado State University Cooperative Extension. Apply a pre-emergent weed killer to your lawn. If applied before seeds germinate, a pre-emergent can effectively control crabgrass, foxtail, barnyard grass and goosegrass. Apply dormant oil before plants leaf out.
Dormant oils are horticultural sprays with high safety ratings for people and animals.
Apply before leaf emergence to help manage scale Insects, aphids and mites on trees and shrubs. If bulbs are sprouting too soon, add more soil to the bulb beds. In Colorado, bulbs need to be planted deeper than generic recommendations. Tulips, daffodils and hyacinths should be planted about 10 inches deep instead of the commonly recommended six to eight inches. Next year, if your previously planted bulbs send up leaves too early in the season, add a couple of inches of loose soil or mulch.