Building small tunnels around your plants with greenhouse plastic is a way to add warmth to your plants. This will result in quicker growth and an earlier harvest.
Build them 18 inches tall, and use a wire hoop arched over the plants and then a greenhouse plastic covering.
Here is a link to a source for 6 mil greenhouse plastic. It is tough. It’s 12 feet wide by 25 feet long, so it’s a lot of plastic. You could build a lot of tunnels, or perhaps share it with a friend.