Frost Line in the Ground?
I'm having to remount the Mailbox as the Township Plow winged it a couple weeks ago when we had that last blast of the season.. Now that the snow is gone I've started by digging a hole.. The original setup is a 4 X 4 post set in an old milk can.. I dug down about 18 inches and made the hole wide enough with the idea of pouring some cement around the can filling in the hole.. I would like to hammer some rebar into ground as well in the hopes of keeping the base secure.. I attempted to hammer a piece of rebar but only got about 6 inches before bending the bar.. For a total of say 24 inches below ground level... Now my question, Would it be safe to say possibly another month before the Frost is all gone out of the ground??