Even if the tops have been freeze-killed, the bulbs are probably fine.

I'd leave them & see what happens.

Best luck!

Thank you! I was just outside this morning (oh joy! 60 degrees today!) and I can actually see a couple of bloom buds beginning to emerge. Better late than never!

I am so relieved because these are nearly the rarest bulbs I have and I don't want to lose them.

They are, admittedly, borderline hardy here

For such borderline things you might consider thinking about whether or not you might have some microclimates on your property.

I know here my microclimates might be wherever the snow melts off first. I had a little patio dahlia return for several years that was in a bed next to the south facing side of my brown brick house. I finally shovel pruned it though as I had never cared for it.

In your zone/area, your microclimate might be where frost is less likely to form.

Sue