Not much for seedless zone 4 beyond Concord Seedless. I would get a seeded grape, e.g. Swenson Red or Steuben. Go to double A vineyards and hit the zone 4 checkbox on the left of their catalog and you can see all the grapes that will work for you. They are also the best grape nursery out there so you can feel confident in ordering from them.

Scott

cody:

I grow Canadice in zone 5. SE WI. Nice grape and I love the flavor but last winter I had -18 for the low temps for 1.5
weeks. This spring all the tops were dead . Luckily they are propagated from hardwood cuttings. The roots were alive and pushed new suckers. I left one sucker and staked it. They grew to 5' tall by the end of the
season.

Reliance is hardier than Canadice but I have also
had severe die-back on some cold winters as well.

I do not suggest Reliance for zone 4. Actually I do not know of any seedless grapes reliably hardy enough for zone 4 unless you want to bother with taking the canes off the trellis, laying them on the ground and covering them for the winter.

I too would suggest Swenson's Red. Or Edelweiss if you want a hardy white. Edelweiss ripened for me in mid-late
August when I lived in Minnesota. It has large seeds and is a bit bland for my taste but many do like it. Very cold hardy.

I recall Worden did ok for hardiness. Try to select something that will take the cold yet ripen early enough in
your shorter growing season. Avoid Fredonia-it survives the cold but you will loose the flower buds if too cold a winter. Concord survives but may ripen too late to get a decent enough sugar content in far north areas.

I would recommend Somerset seedless as well, no die-back last year saw -20F here. Nice tasty early grapes, vines seems disease-resistant. Easy to manage, not so rampant as some of the concord types.

Somerset look great but burbee has them rated for zone 5.
How hard is it to pull the vines down from a trellis and cover them? Sou ds tough after a few years...

I'm in mountains northern vt. Zone 4a. Last four years have given us a couple pretty good test winters. The somerset has seen no die back. It grows up along the back deck rail and is fully exposed.

Pulling down the Swenson vine is no big deal. You prune it back hard (which you would do anyway but not usually until spring) and drop it to the ground and cover it with mulch...15-20 min of time.
It is then at higher risk of vole damage but so far has not been an issue for me
It does require that you have a bit more horizontal space, so that you can train the main trunk to a low angle as opposed to straight up. I suspect this will. Become increasingly important as the trunk ages and get a stiffer.

I should add, that I'm relatively new to grapes. But I assume that like trees, hardiness is not entirely about variety, but also fall weather and even soil type.
Somerset has so far proven completely hardy for me, but your mileage may vary

Check out the cultivar "Ontario" from the 1950's. Works in Winnipeg.

Somerset it is, sounds delicious. Now the only question is should i plant 1 or two vines? Im going to put up a 15ft wide and 12ft tall trellis along this wall in the spring. Thanks for all the help!