Yes, it is ok if the soil freezes after you have buried your bokashi pre-compost. The bokashi microbes will go dormant in low temperatures and there will be much less activity from soil biota. You will see slower break down of the bokashi pre-compost into your soil during cold weather. But, don’t worry, things will pick up again as soon as the temperatures rise.
You might like to read this: Winter composting: Getting the most from your bokashi bucket (https://bokashiliving.com/composting-in-the-cold-and-snow/)
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