And another: "They don't keep out of the ground for a long time. You can keep them for a few weeks, but they need to be in cold storage for any longer term, and I doubt whether one can get away with a year of cold storage. Just leave them where they are and figure out what to do next spring (2011) when you will know what is going on around your yard after all this work. You can always buy new bulbs if you need to. Tulips are a bigger problem, as they don't persist very well here in mid-Missouri."
I think what this is saying is I should just leave them as long as feasible. I'll mark which ones I want to move, and then try to keep an eye on things and see what's in danger of being ripped up by contractor machines; if they're not, I'll probably just leave them till fall, when I can overwinter them in the garage.