Rosa damascena is hardy down to zone 4b/5a so should be OK in your zone 5 area. There are 2 types of Damask roses.....Summer Damask and Autumn Damask. Summer Damask is a once bloomer in summer. The Autumn Damask is classed as a once bloomer in summer but apparently can have scattered bloom in Autumn. Summer Damask grows to 5 feet. Autumn Damask tends to be slightly shorter.
Rosa centifolia is hardy to zone 4. This shrub can grow up to 6 feet tall in ideal conditions.
You could try Vintage Gardens mail order. They are in California. Here is their website....
www.vintagegardens.com
You could also try Pickering Nurseries. They are a very good company and, although they are in Canada, they do ship to the US. Here is their website.....
www.pickeringnurseries.com

PS....If you are worried about the hardiness or if you are in an area where you have a lot of wind in the winter, you can always apply a nice mulch around the roots 6 inches or more deep.

thank you for your prompt and helpful information. you live in a beautiful area!

You're welcome Sallylouise.....I'd love to see photos of your mass plantings when they are in. I bet they will look (and smell) incredible. :o)

well, we certainly will take some pics once we begin. we have a website
www.dayspringfarm.net - it has a few pics of our small lavender field.
yes - someday, Lord willing, we will have incredible aroma, indeed.
i was wondering about roses from CA. one nursery here in colorado does not like to get roses from CA due to higher likelihood of importing bugs or disease. that is opposed to importing from OR or Canada. what do you know about that?
thanks

I don't know too much about roses from CA. I would think that if the nursery which is shipping the roses is a reputable one, the roses would be in very good health. Probably best to ask on an American based site about that question though.....try Garden Web. They have a whole area for rose questions and I'm sure some one there will be able to advise you.
www.gardenweb.com
Click on "garden" under the forums tab and then click on "roses".
I do know Pickering Nurseries in Canada are very highly rated and people from the US do order roses from there quite frequently.
I'll check out your website....good luck with your roses. :o)

thanks again. the info has been most helpful!

Lovely website and farm Sallylouise. :o)