I would only go to two places. One is almost anywhere just on the other side of the cascade mountains, that is the east side. That way your protected from the possible catastrophic earthquake that is expected as well as the already existing radiation from Fukushima and any future meltdowns from the earthquake or anything else. It gets tons of sun and varying amounts of wind so green energy is easy. It gets a pretty decent amount of rain although is significantly dryer than west of the cascades. It also has lots of mountains which are scenic as well as holding snow which melts and feed the rivers and streams all year long. We are rather well protected from climate change (or so they say) as we have the cool air from the Pacific as sort of natural ac. Fertile soils and a WIDE variety of foods grow here, from vineyards and orchards to wheat and other grains. It's rather cheap compared with say, the Willamette Valley(although that place you can grow almost ANYTHING unless moisture is a problem). The downside is that we have huge forest fires and occasional droughts that can be a problem.
The other place I would go would be Michigan's upper peninsula which is also vet scenic and has a sort of mountain range, although nothing compared to almost anywhere else. On the plus side you have 3 great lakes, and can buy beautiful wooded land, 30 minutes from Lake superior and Lake Michigan for around 1k-5k an acre. Water, you won't find more fresh water access anywhere else on Earth - FACT! Lots of stuff to do and see, very close by. It's protected from most types of disasters, at least any that have ever caught my attention in research, no real forest fires. It's probably full of the nicest people anywhere(so is Washington and Oregon for the most part)
The growing season is short and the soil isn't the most fertile. However if you believe in climate change (which is happening) then the growing season will increase, you'd just need to wait it out.
I live in the Columbia Gorge area, on the east edge of the cascade mountains in the Washington side. It's cheap and LOTS of great land average of 3.5k per acre. I run entirely on solar most of the year and could also run on wind but just haven't bought a turbine, YET! It's beautiful but requires a bit of driving everywhere. I own 10 acres right off a main road, ALL wooded. I don't have a well yet but I'm saving for one. It has a very low population of very religious people who have been preventing growth for years but that's finally coming to an end (not my crowd) however the issue here is that tens of thousands if not hundreds of thousands of Californians are migrating to the Northwest. Some maybe because of climate change others because of overcrowding possible, who knows for sure. When I was down there I saw it go from rather green to being reduced to almost wasteland by the drought.
As for the Upper peninsula of Michigan (aka the U.P.) no one is really migrating up there lol Beautiful place!
Those are my recommendations for those who want to prep-homestead or just off-the-grid-homestead. If you want to homestead, I think it should be determined by where you want to live, what climate you prefer and what you want to grow.
