Couple of things to consider, as far as growing a large garden at an elevation of 7900ft. Your season really is going to be very short. There will be a lot of vegetables and fruit that simply won't reach bearing size because the warm weather just doesn't last long enough. Nights get cold in August up there . .. (we lived in Utah for 21 years, similar altitudes)
Water will be another limitation - there's a fatal flaw in the idea that you can grow vegetables and fruit using only rain water. Even with large cisterns or other rain water collection vessels, you'll use up an amazing amount of water once the weather warms up, and it gets dry - i.e. sunny weather that you need to make your crops grow - you will quickly run out of water and there won't be any rain to replenish your cisterns. Turning on the tap to keep your food growing will become very costly in a large garden, and heartbreaking if you can't manage to irrigate everything.
There is a river near the town, but you'd have to contact the local Extension service to find out if a small commercial garden would be allowed to tap into water from the river. Otherwise you might be able to drill a well, or better yet, buy a property with a well so that you can keep watering with untreated water.
You'd also have to find out about the fertility of the soil in the area from the Extension service.
