Best time to move mature plants is during its hibernation period in the winter. There are a few videos on Youtube which shows you how. For large plants, be prepared to have some help.

In many parts of California, there IS no "dormant" period.
Where are you located.

I think, you can move a rose at ANY time, if you absolutely have to, but the best date to move a rose will be dependent upon where you are, and the best advisors you can find are those who live where you do.

Jeri in Coastal Ventura Co., SoCal

Fori, if this is a house you just moved into, I would advise a bit of wait-and-see, aka patience. For "senior citizen roses" such as these, a little caution and respect are in order. They may look less than picture perfect at the moment, but there may be a very sound reason why they've survived in that location as long as they did.
At the risk of stating the obvious, what is important is not just where you are moving the roses from, but where you are moving them TO. You want to make sure that the soil in the new rose bed is well prepared for its venerable relocated tenants. Are you going to be battling invasive tree roots from plantings nearby? (A battle we all pretty much lose in the long run.) You may also want to watch how the sunlight pattern changes over the course of the year in the prospective new location. Frequently the place we thought would be ideal turns out to be less so.
If it were me, I'd watch how the light changes in my garden for the current growing season and prep the new bed with an eye toward moving the roses in December or January -- assuming I'm still confident the roses would get 6 hours of sun a day. Meanwhile I'd coddle them in their current location with TLC (which in rose talk means fertilizer, preferably something like alfalfa, and a nice deep layer of compost, and lots of water), so they'll be as healthy as possible when I move them 8 months from now.
Hope this helps,
Kay

Thanks for the advice!

I'm in the SF area, so roses do slow down in the winter but don't stop altogether (although it looks like if they are cut back, they stay that way until spring).

I'd like to leave them, and I will as long as possible, but if we have to remove the greenhouse (against the house and with a questionable future) I'll try to save them. Siting them somewhere like where they are will be tricky. I do have a location several feet away at the same angle but they'd have their back to the house instead of glass. I wonder if they'd mind.

I don't know anything about roses and less about these. They're just too pretty to trash. (And in my climate, I'm starting to think they are the only redeeming feature of the greenhouse. I SHOULD take out the greenhouse for a variety of reasons and when I think about why I don't want to, it's because it's so cute. And when I think about why it's so appealing, it's just those plants. But I don't have enough space to have a 13x18' greenhouse JUST for some roses that aren't even using it.)

One reason these roses did as well as they did is that the previous owner (and original owner) were very serious about their roses and other gardening projects and knew what they were doing. (I'm more of a "gee! the nasturtiums reseeded themselves. Yay I'm done" type of gardener.)

Anyway, thanks! I will try to get these in as good a shape as possible, whether they stay or move.

Fori -- If you're free next Sunday, come to El Cerrito for the Celebration Of Old Roses. It's a wonderful place to spend a few hours, but ... MORE IMPORTANTLY . . . You'll find yourself surrounded by people who grow roses in the general Bay Area. There, you can get really good advice on this project.
If you come, bring blooms from some of your mystery roses. It sounds like they may be quite nice, and at Celebration, there's a table for "unknowns." Set your blooms out in a jar and see if you don't get some good suggestions on names.

The link below will take you to information on the event.

Jeri

Here is a link that might be useful: Celebration Info At HRG Website

Thanks Jeri--that looks kinda fun!

It's VERY fun! If you come, look for me at the Local Groups table!

Jeri