I had some flower pots with MMJ buried in the garden up to the top and the worms crawled in the drainage holes and found a good home. The plants on the patio get very warm so I cover the flower pot part with many thicknesses of newspaper and have to cover the soil with several inches of grass clippings.
They will crawl out as soon as there is insufficient moisture. Mulch heavily, keep them watered and you should be okay.
A nice trick for growing outdoors in containers is to line the inside of the pot with bubble wrap. That will help insulate the soil and roots from getting to toasty.
Happy growin!