How much does it cost to board a horse?

Depends, board can be from 100 dollars a month to 500 or 600 dollars a month it depends on where you board, look into it, you may find that you could get a really good deal. so don't settle with the first place you find, search around to different places. Indoor stall boarding tends to be more than outdoor boarding so try outdoor. Also look into what the place has to offer and if it's worth your money. Some places have trails, 3 indoor arenas, air conditioning, heated barns, 1 outdoor arena, and a few bathrooms and cost 500 dollars when another place has no trails, 1 indoor arena, and one bathroom and cost 100 dollars. It is all up to what you need, what you want, what you are willing to pay, and what you can afford. :)
The cost of boarding a horse will vary according to several factors. These include, but are not limited to, the farms location, if it is a show barn, whether the horse lives outside or inside, whether hay and bedding is included in the board, and many other things can factor into it, If you board your horse outside 24/ 7 then the costs will typically be lower. Roughly $150 to $350 a month. If you board your horse in a stall with or without turnout, you can expect to pay somewhere around $300-$1200 (or more) a month.