Advice for overwintering Spicebush Swallowtails?

[branduin]

I reared 2 Spicebush Swallowtails over the summer and they formed their chrysalises about 2 1/2 weeks ago. I've only ever raised Monarchs so these are new to me. One formed its chrysalises like normal with the silk thread connected to a branch but the other one formed laying down so fingers crossed for that one!

I am wondering what will be the best scenario for overwintering them? The house we live in does not have an actual basement as our lower level is kitchen and livingroom as well laundry area and such so I don't have a cooler indoor area to keep them. We do have a garage which would be out of the elements but still cold or I have a garden shed made of landscaping timbers so it's not airtight and would give a more accurate temperature. I feel like I want to keep them in my office to watch them but I know that it will be too warm and probably cause them to emerge early. I am thinking it will be best to move them to my garden shed and set them up for the winter out there? Let me know if anyone has advice on these or has raised Swallowtails though, I don't want to screw up on my first venture into it!

Also, what month/temps should I expect them to emerge? Where I live in Illinois our official "frost free" day is April 15th.

Here are some pics of my babies:

[Mona Miller]

http://www.raisingbutterflies.org/
Raising Butterflies

http://www.raisingbutterflies.org/overw ... echniques/
1. Pupae and Mature Last Instar Larvae. Keep in container with screen top. Mist spray every 14 days or so during the front end of winter; every 7 days or so on the back end. Adjust according to how immatures respond to humidity in their natural habitat. This group of immatures are LEAST sensitive to dessication and mold.

What I do is put them into my garage after the weather gets cooler. I keep them in a net container.

http://www.enasco.com/product/SB46624M
I use these net containers they are really parasite proof for over wintering pupae.
http://www.enasco.com/product/SB46623M
This one can hold a lot of host plants.