Housing prices are the suck right now. Super high and very high demand. Not sure what it is like in Northplains, but just a bit south of there in Forest Grove it is currently insane. IF you want to live in the woods, I hope you are independently wealthy. It ain't cheap to buy a house in the trees, unless your standards are very low or you don't mind being waaaaaaay out in the middle of nowhere. Depending on where in the Portland you will be working, you might look at Scappoose or St Helens. Both are a bit cheaper to live in, but are just a short trip up Hwy 30 to get into Portland. And traffic is usually never terrible on 30. I will say that the Hour commute into Portland sucks after a while. I have lived in the Hillsboro area most of my life and had a job out by the Portland Airport and that commute sucked. If you are going to have a job on the east side of portland, look in Clackamas county or out by Corbett/troutdale/sandy. Lots of pretty trees and such and housing can be a bit cheaper in some of those places as well. You'd be 45min further from the coast, but you'd only be an hr from the Mountain.
Weather is rainy most of the fall through spring. We get a little snow in the winter, maybe 2 days worth but nothing great. Summer is about on par with N. Idaho, maybe a little cooler because of the close proximity to the coast.
Terrain around N. Plains is hilly. It's just about at the foothills of the coast range, so it's not terribly flat. It is in a bit of a valley though. It's less than 15min from the coast range itself so it is easy to get out of town and into the woods. NP is a very small town, but you are like 8-10min from all the shops and crap in Hillsboro/Beaverton, and about 10-15min more from all the douchebaggery you can handle in Portland. Traffic on the Westside is ok. Usual rush hour BS but it's rarely ever gridlock. Lots of rubber neckers and idiots from California that have no clue how to drive when it is anything but sunny out. The only places that traffic is usually crap are 217, and I5 near the bridge into WA. The rest are usually ok for the most part. They have their ups and downs. Compared to Seattle, Portland traffic is nothing.
Closest place to board in up on Hood (a 2hr drive from the westside of Portland). There are 3 main places. Ski Bowl, Timberline, and Mt Hood Meadows. I like meadows the best for terrain. Timberline is higher up and is usually first to open and they run through the summer. I have had some good times up there in July. You can also hit Mt Bachelor in bend, and there is Mt Ashalnd down south and Anthony lakes waaaay the F out east. You are not far from Crystal, Baker, Snoqualmie, and Steven's pass. And it's only 8hrs to whistler.