This is just a recommendation but if you’re making the horse hay for you and want to sell the excess I would find the nearest cattle guy and offer him a good package price on most of the remaining rolls. You won’t get the premium price but you’ll get out of having to store and manage them. Save like 5-10, if you have room, to sell to horse people late in the winter when hay gets scare and use that to get your foot in the horse hay market.
All joking aside, I don’t really like selling to horse people because the are extremely opinionated and seem to want to lecture you about how to make hay if it’s their first time buying, the worst was a 20 something woman who was rescuing horses I still remember her. It’s a hard market to get into as well, horse people have their “hay guy” and if they don’t they only buy from another horse person’s hay guy until they find their own. You have an advantage if you’re already in the local horse circle but not sure how far that will go. I will say they won’t touch it under a tarp or on the ground, the first question is always about how it’s stored the second question is chemicals/fertilizers applied…I’m pretty sure most could lecture for hours about chemicals but couldn’t tell you more than two types of grass
FWIW I’M three years into making my own hay and have only a handful of hose people that call me and usually it’s only at the end of the year when their primary suppliers are out of hay.