I had a community garden plot last year, and pretty much everything was harvested and/or dead by the end of October, though I had a few kale seedlings that were previously just getting by in the shade of the other plants. I didn't even bother to harvest them, and i didnt go back to the plot that season. By the middle of December, I got an email that it was time to do the end-of-the-year clean out so they could prep for next year's plot assignments. I went back, expecting to just gather some tools I had stored there, and found my entire plot was kale. I spent hours washing, chopping, and freezing it on sheet trays. After each tray was frozen (much easier to do that in a chest freezer) I bagged it up, and I ate frozen kale for months.

Mustard greens are another one that are amazing for resistance to weather and pests