Come October the lawns around Longmont are covered in little grey cores, and to anyone who knows what they mean it is the best-looking mess of the year. First Due Aeration & Lawn Services pulls those plugs out of ground that spends all summer being walked on, watered thin and baked by high-plains sun, opening a way down for air and water before winter closes the door. The rest of the round is the steady stuff too: mowing, trimming, edging, cleanups that leave the borders sharp. Timing is everything here, because aeration done in the right two weeks of fall is worth twice the same work done late. Spring shows the difference before anyone has to be told.