Here’s a good article from myswingle.com on winterizing landscape.
Think of winter as your landscape off-season in your annual game plan. Take the right steps now to set yourself up for success next spring.
Your turf will fare winter’s weather best and come back with more vitality in the spring if you aerate while it is still green. Give your turf some breathing room as it transitions into the cold season. Swingle’s fall aeration breaks up the dry, compacted Colorado soil, allowing water and nutrients to reach the roots. Watering your turf by hand during the dry winter months can help it green-up faster in spring.