I'm very vague on succulents but are you quite sure it's a Sedum?

It looks like an Echeveria hybrid to me; maybe Graptoveria ’Fred Ives’. It doesn’t look like it has any Sedum in it.

I would not expect these hybrids to take much frost.

While I was TOLD it was a Sedum, I would accept that it really isn't. I have little experience with Sedum. I looked up Echeveria, and I agree it does look something like that. The images of Fred Ives I see have leaves that are much less rounded and more elongated than what I have, though. I also read that Echeveria is zone 9, and damaged by ANY frost. This one was not. Well, at least a day or two after the 25F overnight (see photo) I don't see any obvious damage.

On the other hand Sempervivum looks similar, and it is highly frost tolerant. Maybe tectorum? All of these are Crassulaceae, though somewhat striking that the degree of frost tolerance varies enormously among them.

Look, I live where it gets well below freezing, and I'm just saying that what I read is that an Echevaria won't survive a hard freeze. But this one apparently did. I said that it did indeed look like an Echevaria, but my research suggests it's not a Fred. It also looks like a Sempervivum. Not surprising because they're both in the same family. But I've posted to another forum, and we'll see what other insights come from there. So if you're out, I'll just thank you for your ideas.

OK, I have it reported that Echevaria don't LIKE 25F, but they might survive it. Also, the rounded leaves do resemble 'Fleur Blanc'. Also, I have edited my OP accordingly. But the resemblance to Sempervivum seems striking to me.

The leaf texture is wrong for Sempervivum. The latter are not so plump and rubbery and they have toothed leaf margins, even if the teeth are sometimes extremely tiny.

Fleur Blanc is hardy to 30F. Echeveria lilacina is hardy to 15F.

Definitely an Echeveria. In a pot, tie CW is to subtract at least 1 zone from the hardiness. Even if it survives an experience at the edge of its' tolerance, you probably don't want your plant to have to go through the "just survived a near death experience" appearance.

If it was a Sedum, that would still be impossible to nail down without more info about the species/hybrid. There are Sedums that are hardy down to Z3, and there are Sedums that can't handle freezing at all.

I can't edit the typo I just noticed above, it should say "the CW", not "tie CW".