I went on vacation from April 6 to April 15, 2012. I left the snowmobile trailer gardent out during that time and the temperature dropped below freezing many times and got as low as 24.7 degrees. On Monday April 16 we had snow which covered the containers . It reached a low of 28 degrees. I put the trailer garden out on April 17. All of the spinaches, lettuces, and peas are still good. the carrots and potatoes have not come up yet.