Well, we don't need to worry about crabgrass that already germinated, if any. This morning when I headed out the door at 4:30, it was 22 degrees out, I live about 30 miles north of St. Paul, MN. It's 9 am and about 20 minutes ago it crossed 32 degrees. I had to come back home and put the PG Magnum in the garage. It wasn't supposed to get that cold last night, so I left it in the enclosed trailer. This morning the nozzles were froze, so I've got the heat cranked up to 80 in the garage. Hopefully by 10 am I can get back to cleanups before we lose Thurs-Sun to rain / snow mix. Nothing like highs in the upper 30's-lower 40's and the lows below freezing to get that grass fired up.