many of the spring flowering bulbs send out roots the previous late summer or early fall. even within species you can get some wide range of that too (as i have found with various tulips). it usually doesn't kill them to disturb them, they'll regrow the roots, but it might set them back a little - but sometimes you just have to do it... garlic seems to be forgiving about when i get it planted. September through November seems ok for it, once in a while i have found myself planting it in December.I decided to plant out my garlic yesterday after accidentally digging up a Bluebell bulb and seeing that it had already started to send out roots.
Today, I got the last bed for the year made up, so tomorrow, I will be planting out my shallots and if there is any room left, sow a couple of different types of Onions......seeds getting old so its now or never.