Good choice, but I'd do this outside if possible. -20 is not normal for Richmond BC, even here in northern Ontario it's rarely -20 for more then a couple of days in a row. Closer to 0 you should be fine to do it.
It will etch the concrete if you do it in the garage, I'm not sure about the bath tub. I was a little surprised how little grass I killed when I did my rock in the summer.
After you wash and dry the rock I'd soak it in RO for a day or so. I tried mine in the sun so of course I got dust ect but since you are doing this in the winter you will have to dry it out inside, still can't hurt.
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