SPOILER ALERT!!!
I know this may be a dumb question but that is snow covering the field right?
Stepping out of my usual wise-*** role ... Yes. There appear to be footprints and possible machine tracks tracks on the surface/snow.
If you've never lived in a cold climate you might not know that a snow cover over grass, tree roots and plants over the winter months is a good thing. It provides insulation and moisture. It's also not good to compact the snow which is probably why the field shows no sign of any real traffic (human or machine) of any sort.
End of groundskeeping lesson #5-a.