This photo is earlier in the fall.
The small garden is sheltered by a low brick wall, and it's in full sun; apparently enough heat is stored in the brick to temper the overnight temperatures.
The snow peas have been frosted, and the purple mustards show signs of frost damage, but fresh leaves continue to appear in both the mustards. The turnip greens, kale, broccoli, and collards are fine, as I'd expect, but the spinach also looks wonderful, and amazingly, the arugula in the mesclun mix is looking fine. Ditto, the lettuces, which must get enough warmth from the wall to be sheltered from frost damage.
Perhaps I need to build a wall around some of my beds at home to extend the season!