I have two horses of my own right now. We keep them in the barn at night and they get turned out during the day. I feed oats and bran, and the colt gets Grow Colt supplement. In feed I spend about $95. I use a round bale in the pasture because our grass is gone already (those pesky runaway lawn mowers) and one lasts about a month and costs $35. In the barn I use square bales, and go through about 2 bales a day, so 14 bales a week and we'll say 50 bales a month, I pay $3.50 a square bale so that's $175 a month. Then you have to account for hoof trimmings (I go barefoot) which is $45 a horse every 6-8 weeks (so we'll say $45 a month for both horses since it's done every 2 months)... Plus worming (everyone worms differently so I can't really give you a number on that, I generally worm every 2-3 months rotating wormers)... If you use electric fencing, take into account how your electric bill will go up, also take into account any emergency farrier or vet bills (Koti had a tooth kicked out of her mouth and it cost $150 to have the rest of the tooth pulled, and Sam cut his leg open like the foolish colt he is and it cost another $177 to stitch him up and put him on antibiotics)... I also use shavings in the barn and use two bales of shavings for the week per stall (4 bales of shavings) and they cost about $5 a bale so tack on another $20... In total I spent about $370 for both horses, bare minimum not including vet fees and worming and any other expenses that might pop up. It's cheaper for me to keep them home because board around here is usually $450 a month PER HORSE... I'll take the $370 a month over the $900 a month.