How long does Supersoil last???

Hello everyone, I was wondering if my supersoil is any good? I started out in late June amending FoX Farm happy frog soil with all the goodies needed. My problem is that it's sat outside in a large garbage can & hasn't been rotated or anything in a couple of months now. It's got down to 2 degrees Celsius. Yea we are LEGAL now. Lol

That's fine the fungal and bacterial life that makes your nutrients bio available are capable of going dormant. Much as they would naturally here during winter.
Your soil should be better off today than the day you mixed it.
Soil does not need to be rotated, Only hot compost requires that. If you are going all organic I suggest reading a little bit more into no till organics.

It should be fine, if you can set it somewhere to warm up to about room temperature for several days. Give it a smell, if it smells like rotten eggs it has gone anerobic, if it just smells like fresh soil/compost its good to go. I would recommend using a bacterial tea(AACT) to add more beneficial bacterial life to the soil, sometime during veg.