re: And then there were three

@retired_guru_tech … you are correct in that each cold frame is different.
CF #1 is three windows wide.
CF#2 is two windows plus a small one
CF#3 is one window plus a small one.

They are all built to the same plans, just different lengths.
They, also, have different weather conditions.

1. gets full sun for most of the day.
2. is pretty shaded and has a small window of sunlight.
3. gets the same sunlight exposure as #1 except that it sits beneath a bush that will give it shade once the leaves appear.

I have purchased three thermometers that will measure the high/lows of the day but haven’t gotten them in yet.
Tonight and tomorrow night are supposed to be freezing temps
So it will be a good test. One of the thermometers will be going under a row cover that I am also using for the first time.
Let the experiment begin!!