I've never tried this but how about one of those small DIY greenhouses? Apparently they're pretty easy to make. I'm not sure how cold it gets at your latitude but with a greenhouse you could manage to lower your zone a level. Maybe enough for those carrots.
Worst case I guess is just grow winter crops during the summer. Half a year of cheaper food is better than nothing.
Wear a facemask. Airports and planes are high risk infection zones.
Kill two birds with one stone.