I guess it depends a bit on where you are and how bad it's snowing and freezing outside at this time of year. In the Pacific NW, my newly planted blueberries did just fine over winter outside. They weren't in pots but a good many people plant blueberried in pots. Others may disagree but I think you'd be fine if the temps don't freeze badly in your area.

Good luck!

Here is a link that might be useful: Sinfonian's garden adventure

Chuck:

The good news is that you have helped your potted blueberries survive the winter in your garage. But in so doing, you have also encouraged precocious blooming. I would say that the sooner you get them outdoors and slow them down a bit, the better. If your weather forecast calls for a very cold night, say below 29F, I would either throw a sheet over them or take them back inside for the night. In Delaware, you might not ever have to take them back in at this stage of spring.

The only possible bug in the ointment is the lack of bugs in the ointment. Blueberries are normally insect pollinated, usually by bumblebees, and there are not any out and about at this time of year. So your efforts may be for naught for the blooms you have now, but do get them outside. If you can possibly put these blueberries in the ground instead of containers, do so.

Don Yellman, Great Falls, VA