wow - that's awesome !!! I had no idea they were that tolerant to cold.
Last year, my wife was big on worm fishing for bluegill and other panfish.
Now, she has migrated to artificials and live baits . . . .
during the "worm term", I got tired of paying $4 for 30 Red Crawlers.
These are European Red Night Crawlers - - - they do not crawl out of the box.
So I got a 20 gallon tote-tub and painted the top and outside black. (they don't like sunlight)
Got some 2 month old horse manure and baked a big pot of it in the oven
to sterilize it from unwanted bugs and such . . . . (no, it doesn't stink up your oven)
then, mixed half and half with Peat Moss from the hardware store.
Wet it and turned it every day to ensure it is all mixed up good with no dry spots.
Drilled Drain holes in the bottom and let it sit for a week to acclimate.
Then, every few days or week or so, I would pick up a box of worms from the store and put them in the tub.
Saved up my food scraps in the freezer in a coffee can . . . when the can got full, thaw it out and run it through the blender.
Let the blended stuff sit in a stainless pot for a few days to ferment, then put in zip-top bags
and freeze them. Now, once a week, I thaw out a bag and spread it on top of the worm's dirt.
Don't mix it in, just pour on top of the dirt. The worms will come to it when they are hungry.
Cover with several layers of wet newspaper and keep the top closed tight and they will be happy happy happy.
Then, they start laying eggs - which will turn your initial investment of 100 worms into
several thousand in just a short few months. One worm lays one egg capsule a week - each capsule has 4-6 babies.
LOL do the math - - - a real money saver if you use a lot of worms.
Many good videos on YouTube on how to set up and maintain a good worm bin for fishing worms.
Do not use Red Wigglers if you plan to fish with them. They are only good for composting. Not fishing.