Sorry I missed your question. I'm not really sure, but I would guess at least 20. But, to be certain, just give them a call. They do get booked. You won't be disappointed in staying here. It's just beautiful without the arrogance....if that makes any sense.
I think I read there were 30 some? The rooms are in all different buildings. We stayed in the "barn" but the room was not like a barn. I thought they were pretty roomy and clean. I'd go back.
Get an answer from Mission Ranch staff and past guests.