Are you looking for foliage year round/evergreen, or is deciduous OK?

Do you know what type of tree is the trunk and how far from it you will plant? Some trees like maples have quite dense roots, and it is tough to establish anything near them.

if deciduous is OK, look at Limelight hydrangea and other cultivars of Hydrangea paniculata. They are hardy in your area, long blooming, and not fussy. If you can find Quickfire, it starts blooming earlier than many others, around Independence Day here in central NH. Limelight starts 2-3 weeks later. Panicled hydrangeas come in a range of sizes, from around 4’ to around 15’ and tend to be about as wide as tall. They start out creamy white, then white, then various shades of pink as the blooms age until frost. I don’t know anything about deer resistance, though my deer ignore them, but you can spray or fence the shrub for deer, especially in winter and early sprIng.

the lack of sun... is going to make whatever you plant there.. lack vigor.. meaning.. very slow growing.. not to mention your short growing season ...

so unless you buy huge plants to start with ... its going to be a very long time before you accomplish your goal ... and by the time you pay for said huge plants .. you may as well think outside the box ...

is there some reason you couldnt put in a couple 4 x 4s ... and a section of wood privacy fencing .. and start enjoying the privacy that evening??

ken

https://duckduckgo.com/?q=patio+wood+privacy+fencing&t=ffcm&iar=images&iax=images&ia=images

ps: also ... instead of looking at your problem from where the camera was ... move that chair around your patio .. and sit in it.. and see if you can see that house from every angle.. it might not be as big a problem as you see from the camera ...if you did go with the fence section ... i would leave a standard gate width at the house ... to make it easy to go around that side of the house;.... you dont need a fortress wall there.. just a site block ... in other words.. make it a free standing thing.. not a part of the house ...and of course.. in the mean time.. you could plant some shrubs out into the lawn .. so in 10 years.. when the fence is rotting.. the shrubs will be there ....

Based on how nice the grass looks I think you might do better growing shrubs there than one might think. Not sure on the deer resistance on all of these but look at Dogwood, viburnum, ninebark, the hydrangea already mentioned, Cotoneaster, Fine Line Buckthorn (not banned in WI)

The big tree is a red oak and i'll probably plant the shrubs about 6 ft away from the trunk. I may attempt one of the larger red twig dogwood varieties and hope it grows big enough, Thanks for the ideas!

Cotoneaster hedge