The Missouri Botanical Garden lists Champlain as being hardy to zone 3 - 8.

www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=252080&isprofile=0&

Available from - Old Market Farm
www.oldmarketfarm.com

Champlain is a mildew magnet in Southern California. It's going, going, gone.

Champlain and the fellow Canadian Explorer rose William Baffin were the first roses to bloom in my Midwest garden this year. (Out of 100+ roses).  My theory is that these Zone 3-hardy varieties will bloom earlier than most other roses when situated in warmer climates (I am on the border of Zones 5 & 6).  My region experienced a very warm April, and I believe Champlain and Billy Baffin were 'fooled' into thinking it was later in the season than it actually was!  At least that's my theory....  Other than that, I love both of these roses for their toughness and willingness to bloom bloom bloom.  Champlain's color is deep and velvety.  A very saturated rich red.  It's been in the ground less than a year, so the bush is still filling out, and looking a bit gangly.  But it's making up for it in bloom power.  Last season it went strong till the killing frost, even though it was a small specimen planted late in a punishingly hot season.  Champlain is a workhorse in the garden!  Claire, St Louis, Zone 5/6