Hi Kathy!
@pinkruffles
I'm not sure my experience will be close enough to what you are hoping to do, but there may be enough parallels to help you decided, or wait until someone with an exact match (or just more experience) comes along to respond.
If you are opening and closing the garage door, there may be times when the temp drops below freezing, and depending on whether it is detached or attached garage, it may not re-heat very quickly inside. But, I wintered my seedlings (similar size and leaf number) through 28 degree weather last year, though it was outside and they had a lightweight frost blanket over them and were surrounded by larger potted plants to help hold in some heat. So, finding a way to insulate their area in the garage like that might be helpful. Even a blanket of some sort that is draped so that it does not bend or crush the leaves can help keep any possible frost from forming on, and damaging, the seedlings and keep them from cold, gusty winds that can enter when the door is open.
My seedlings did not get much sunlight, but they did get indirect sun every day (northern shaded side of house) so it helps if their time in the (possibly) dark garage is temporary, or is helped if there are windows in the garage. Mine did not grow much but nearly all survived (98%?), and the ones that didn't make it were lost only after warmer weather returned, and was more likely due to spring stress. That might be avoided by tilting the pots at a slight angle so that any moisture in the soil will drain well, from what I've heard of others who partially winter their full-sized daylilies in a garage.
Hope this helps ... if no one shows up with a better parallel to your situation, you are most welcome to come to the Daylily Forums to ask your question, too. It is a warm and welcoming group that has lots of great experience to share.
http://garden.org/forums/view/...
