The first hard frost silvers the whole Quaboag valley, and from the high roads out of North Brookfield you can watch it burn off field by field. R Faith Enterprises Inc. works either side of that morning — mowing, trimming and fall cleanup while the ground still gives, then plowing, shoveling and sanding once it has locked up for good. The turn happens quickly in these hills, and being ready ahead of it is half the job. There is plain pride in a driveway cut down to the pavement, banks squared off, a walk bare enough for boots. By April the mowers come back out and the year starts again from the other end.