I know this reply is a month late, but I have been working with a chitosan product that will increase your frost/freeze tolerance down to the mid 20 degree Fahrenheit range. We had that same temperature here in Colby that same time frame. Sprayed my tender garden plants with it, cold didn't touch them and we held a 25 degree temperature for a few hrs.
I would enjoy some more info on it? And also the beets made it!