it's a nuisance to pick up everything and move it into the garage. A few weeks ago, I decided to find a way to leave them in place, and I hit on the idea of making a cold frame (like a greenhouse, but designed to keep the temperature a little bit less cold instead of really warm). I went to Home Depot and bought some 3/4-inch (19 mm) PVC pipes, connectors, and plastic sheeting. I went hunting online and bought a Palma Bio Green heater and thermostat.
This afternoon, I volunteered my younger son to help me assemble everything. It wasn't difficult to do, but the wind made it feel like 26 F (-3 C) while we were working.
I set the thermostat at 40 F (5 C). I'm keeping my fingers crossed that this works as expected. At 4 o'clock in the afternoon, the temperature has already dropped to freezing, and it's supposed to stay that way until around 11 AM tomorrow. In 6 days, I'll be back at 64 F (17 C) again.... I plan to put up the cold frame only on those few days that really need it, then disassemble it and stash it in the garage.