It is late to start regular winter veggies. I have radicchio, kale, bok
choi and collards, all started between June and August. The temperature
has not been above freezing in 4 days here, but of course it is above
in the hoophouses. Today I harvested a bucket of assorted greens, all
unfrozen.

If you put a hoophouse on the garden now, you would be better off
starting lettuce, arugula or radishes. Spring things that sprout even
in cold soil.