I've been to 3 barns in the past year, and that's an unfortunately long story that started with me being mistaken about a "dressage trainer" who was cracked, and then moving to another barn I was unhappy at because I was mistakenly under the impression I was not welcome back at the barn I had originally moved from, only in hopes of having a dressage trainer.
I will start with what we will call Barn A. Barn A had 13 stalls that were 12x12 box stalls. They had a relatively small tack room that combined school and boarder tack. Tack trunks were in front of stalls, but the aisle was wide enough so that they weren't in the way. One set of X ties. One "wash rack" that seemed to be used more for hay storage. Port-a-potty. One small arena, that would be suitable for dressage perhaps, because it was just slightly off the measurements for a large dressage arena, but not good for any jumpers. Grass footing. They had 3 small-medium pastures, and one tiny dry lot. A supposedly 70' round pen that looked more like 60', rusty and about to fall over. Shelters in fields. She fed, blanketed, turned out and flymasked. $220 for a stall, $175 for pasture, which is basically the same as stall but without the stall, I believe, and $350 for "show board", which includes 4 training rides a week, grooming and things of the like. You worm yourself. It's a small property, and really, she doesn't have space for more than her stalls, and that's pushing it. I won't factor in how nutty she is and the under-par care she gives, just the services she OFFERS, whether she does them is irrelevant to whether the services themselves are worth that.
The next barn, we will call barn B. Barn B was a 16 stall barn, and each stall was 8x10. Tiny, I know. They had medium-large pastures, with two smaller pastures that they called the Jenny Craig pastures (LOL). It was an absolutely gorgeous facility. Large oval arena, two full size dressage arenas, one with lights, and a 50' round pen with lights. They had an indoor hot/cold washpit, as well as an outdoor cold only wash pit. A hotwalker. Two tack rooms with individual cubbies, and the doors had digital passcode locks and each boarder had a passcode to get in. Restroom with shower. Trails and a big field to ride in. A lounge and upstairs porch with a view. They had room to put an indoor, and were talking of that and installing an XC course when I left. I left because they were not turning out but 3 hours a day, and my horse was suffering mentally and physically. They also didn't really listen to any directions I put down for her. They would blanket, flymask and also wormed. Board was $300, and they didn't offer pasture. I think training was by private treaty with the barn trainer.
The barn I'm at now is less fancy, but larger. Call it barn C. It has around 20 stalls. Some of these are open to dry lots. The others that are not go out in slightly larger grass pastures on the opposite side. They have an outdoor wash pit, cold only. Two tack rooms, one school and one for boarders with cubbies. They have an open area set aside for trunks, and some boarders just keep everything there. They have a "lounge" area with a drink machine. An apartment where the stablehand lives. Restroom with shower. Blanketing, flymasks. Worming is done by owners. They have a covered that is the size of a small dressage arena and lighted. A large outdoor, and a 100' lighted roundpen. Trails used to be there, but the only place to really ride other than the roads and fields is around the very large back pasture. I mean, takes you 5-10 minutes to walk across it. $350 for stall, $220 for pasture, which is the ones attached to the stalls, and $175 for the "back" pasture, which is the huge one. My mare stays back there. Back pasture board is really conditional. It's more for horses that don't need grain. Blanketing/flymasking is done by owners for that pasture. That's just due to the sheer size of the pasture, and the inconvenience to the stablehand to have to go all the way back there and try to catch everyone.
Vet/farrier is arranged by owner at all of these. If you don't consider the individuals that run them, based just on the facilities and assuming that the owner/manager is competent, I think the only one that's really correctly priced is barn C.
It really depends on the area though. In my area, board tends to be between $150-$400. Up towards the capital, you'll see $400+ at least. Location is critical.
Cinnamon Whiskey 11 y/o 15hh Chestnut AQHA mare, 2'6 Jumpers