Hi SAV-
You wrote, "there any close mountain biking you can do there? What about the eastern foothills? We are also concerned about the LDS influence (I know there is a separate forum on this, so won't belabor the point, I lived in SLC for 4 years and it didn't bother me much, but concerns now are for my son). Also a little concerned about the weather, I LOVED the weather in Utah, I love the snow and cold winters, but I have learned that I need sun in order to thrive.
"We have thought about looking for land over in Driggs/Victor to build a cabin for access to Targhee for weekends, but seems outrageously expensive. Guess we'll look more when we're out there."
First, I believe cleosmom gave you excellent advice.
2. If you find land in Driggs/Victor that is reasonable, I think you'll have a lot of people contacting you. With the Huntsman Development plus the Development Greg Norman is involved with, the cost of land in the Teton Valley has escalated and keeps going higher. There are also issues like a temporary freeze on building permits etc. in Teton County, given the rapid growth and some things that have to be resolved.
I don't know what your definition of "reasonable" is, but let's just say most second homes/cabins being built in Driggs are not by locals. Many in Driggs, given the rising property taxes, cannot afford to stay there. I recall a Post Register article probably 8-10 months ago stating that many school teachers lived anywhere from Idaho Falls, Rexburg, Swan Valley etc. as they couldn't afford Driggs.
The Driggs/Victor area many of us knew from years in the past doesn't exist anymore. You may find a some lot or already-constructed home/cabin for sale. But, mostly they are few and far between.
3. I, too, have lived in UT and the Idaho Falls area, besides other areas. It's kind of strange, weather-wise, not only in Idaho Falls but Salt Lake City. I don't know where you lived in UT, but the lows and lower and the highs - well I believe SLC broke previous records this last summer for days over 100 degrees. The 90s started in May!
Business requires me to be in SLC and I.F. monthly. While ID always will be a little colder, I'll take the Idaho Falls wind any day to that in West Jordan and some other places in northern UT. It's actually interesting to see how many people work in both Idaho Falls and SLC. But, that's another topic.
Honestly, I don't see that big of weather difference between the two. When a Canadian pressure hits I.F., SLC is getting those abnormal lows too. Fortunately, Idaho Falls doesn't get the hot, hot temperatures like Salt Lake, Provo and St. George (112 this last year). But, best to rely upon weather charts, not me for factual infor.
I think cleosmom addressed the religion issue well here. I also believe another poster, CWallace, gave one of the best descriptions of LDS families that I've ever read. Since I don't know how long ago you lived in SLC, I can't say for sure how different Idaho Falls residents are/aren't compared to the UT-LDS residents. For that matter, I don't know how the Utah Catholics or Lutherans etc.With over 1,000,000 residents in Salt Lake County, just like Idaho Falls it is becoming more diverse daily.
IMHO, it depends on where you lived in SLC and where you are looking at in Idaho Falls. It also depends on work/job and what would bring you to Idaho Falls. Certain professions/careers recruit nationally. Having LDS employees may make up some of the workforce, but not the majority of the group. Others may be LDS-oriented businesses, so one would expect many LDS employees.
Check out the earlier discussions about diversity in Idaho Falls. I know a couple of non-LDS folks who posted her who now get together for coffee at Starbucks, or other local coffeeshop favorites. They want to add more people from the northwest who have relocated to Idaho Falls. If you do move to Idaho Falls and want connected with them, let me know and I'll make sure that happens.
I do appreciate the dynamics change when one has a child.
I don't find it that different when I work in UT vs. work in Idaho Falls. As I said earlier, IMHO, it depends on what one is ultimately looking for to find the right place for their family.
I appreciate knowing about the Oregon coast. I, too, have to have sun in my life. And even on the very coldest days, there is something very beautiful watching the sun reflect off of the snow in ID or UT.
Along with cleosmom, if I can help answer anything, please feel to PM me.