New Bulb More Cold Sensitive than Grown Plant? And how to Plant

[HiOrcDen]

I've bought a Yellow Fringed Orchid (Platanthera Ciliaris), just a couple of small bulbs. I've read that they are frost tolerant, but I'm wondering how that translates to small bulbs, as they are big plants when grown. If the weather is 45f and up, are they safe outside, and possibly unsafe indoors? Or is their minimum temp higher, such that I should keep them indoors?

Almost forgot, one more question.. the bulbs look kind of like starfish with two legs extra thick... are these thicker limbs the roots, and the other thin limbs should stick up from the soil?

Thanks in advance!