Yes it is year round and was lonely when we went. It’s a good stop over.

Yes, with certain dates blacked out for the fair and a couple other events. Info on “non-fair camping”available on their website Jeromecountyfair.com. Also, water is available only mid-April through Mid-October.

Yes. It's a parking lot (with water/elec hookups) shared by the rodeo arena and the Idaho National Guard. Since the National Guard uses it, I would expect that they clear the snow promptly.

I don't know . We were there is October