Hi Deb,
I grow lots of snaps every year. There are many cultivars, some are more prone to rust. This year, many might have succumbed to it no matter what. That said, the Liberty series along with the Twinny series did quite well. I'm south of you (Kirkland) & have too much shade. They did not flower as profusely as other years, but no disease whatsoever. The Sonnet series is still blooming, but these low night temps will hasten their demise this week.
The Rocket series and the dwarf "Tahiti" are fairly rust resistant. I usually leave them in & let them throw their seed unless they show signs of rust. One that came back reliably from its roots over many years was "Black Prince". gorgeous darker foliage, with a super dark red flower.
So many choices......
