I think they should be fine covered for a couple of days, they won't suffer from lack of light in that amount of time. I've rolled plant carts with seedlings, young cuttings, along with my now 5 yr old zonal geranium into my dark unheated garage for as long as a week without setting things back when we've had a late winter, earliest Spring storm more than once, no harm done.

Thanks! I ended up uncovering them...it seemed the storm was pretty much done. However, it got crazy later yesterday. The loss is not terrible, but there is some damage. I am starting to realize our crazy ice storms are much worse than our rare snow storms. Thankfully, I planted lots. I also saved seeds on anything that I would be devastated at losing. This is my learning year. :)

Every year is a learning year ;) Always something new we may not have anticipated to surprise us.

Very true! :)