Our first mow was a couple weeks ago. I keep a Word document called 'Earth Dates' and note things like first/last frosts, snow dates and depth, first mow, when various creatures return (robins, frogs, red winged blackbirds, etc.), and when trusted plants do something I tie to a planting date (peas in with the frogs, spuds in when dandelions bloom). This year is really late for the frogs, haven't heard a peep yet and sometimes they come out mid-Feb.