How to know if the ground is soft enough to work on after an freezing night?

If you walk around and it seems at all hard, even slightly, then it's too hard
You should, if you're not sure, to avoid to work on a hard ground anyway, or at least, just walk, to avoid any kind of injuries. Of course, don't jump! :)
I would say its shouldn't have white patch on the ground, and be careful on your horse steps if it makes sound, it's not a good ground. And be careful also on your horse's depth feet :)
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