An internet search informed us that we would need an 8' tall fence to reliably keep the deer out (though 7.5' might do it, or 6' around a small garden). There is a lot to building a good fence. The corner posts should be heavy duty, properly braced, and often set in concrete. The line posts should be heavy duty and usually pressure treated wood, although metal t-posts may be used in between the heavier line posts.
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We went to our local farm supply store to check out the 10' tall t-posts needed for the 8' fence. There was simply no way to install them; it would require a ladder on our hilly gopher-hole-ridden land, which was too dangerous. So we went with 8' t-posts and picked up 330' of 6' welded wire fence at the same time. It should have dawned on us at the store that since it took two big young guys to put it in the trailer it would be too heavy for two soil analysts to deal with. But it didn't and we ended up taking it back and getting 100' of lighter weight welded wire, black PVC coated, 6' fence from critterfence.com.
We decided to start by fencing off the main deer trail, thinking this would discourage them and they would go somewhere else. The 8' t-posts are too tall to drive directly into the ground. So we had to dig a hole with post hole diggers, then put the post in, then drive it in with the manual post driver. Since the post was only driven in a foot, we needed to cement it in as well. It was a lot of work, and a two person job, notwithstanding all the time spent on Youtube watching professional ranchers put in posts correctly. There was a steep hill involved, and the neighbor's handyman. Eventually we got all of the posts in. Then we got the fence up.
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What kind of posts do you plan to use? It would be awfully quick and easy to just move some types of posts over, mow, and move them back.
Also I'm guessing you could stretch 3' to 4' or 5' if that would be enough extra space to make the difference for you, but I'm not sure about that.
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