how well do barnevelders fly

[gunsthatfail]

Hi all, I've never owned chickens but I'm considering it. I like barnevelders, wyandottes and considering a two way mixed flock. I have around 1700 square feet of yard/garden and I really don't have any idea if I should make a covered run or an uncovered run, or if I should just give the birds the run of the place. Maybe i should just fence in the garden. If there is a question in here I suppose it is" Are these birds going to fly over a 5 foot fence to get into my garden? or my neighbor's garden? I'll welcome suggestions regarding different breeds.
Thanks.
gunsthatfail

 

[San]

I've got both B/F versions but they can fly up to 1.80 meters so a fence would be a good idea.