ok first is it necessary to make the horses go in the barn when it rain's growing up we never stalled the horses unless they were sick now I do have the covered run in open for them to get in and 2 other shelters but I've noticed that people here put there horses in the barn and the other question is I have an 11 year old gelding that is very mean to my mares they all have large bite marks from him my husband (it's his horse) wants to keep them together said he would just break out to get back in which he probably would what can I do or is there anything I can do or will he stop he is pretty new

In my opinion, horses would rather be outside unless it's really nasty out. I leave Jackson out unless it's a very cold rain or a very strong nasty storm with hail and such. Also, if it gets to be below zero plus a wind chill I put him up.

Is the gelding in with all of the mares? Do you have an aggressive alpha? A friend has a gelding that is SOOOO sweet to people, just wants to follow you around, but he is vicious with other horses. He was actually up on his hind legs fighting the mare he was in with before. They would run backwards at each other kicking, then spin and rear and fight in the air!
She put him in a pasture with her MOST alpha mare.(She is the one we can't put small/young horses in with). They're the only two out in that field and she has begun to teach him a few manners.

I have 3 geldings out all the time. They do have a shelter to get under if they choose to and plenty of tree cover to get under as well, but most of the time they hang out in the rain! We also have a few stalls in our barn but i concider the stalls to be "emergency only" like if we have extreme weather or there is an injury that requires the safty and confinement. I really dont like to keep a horse sutck in a 12x12 stall. It's just not natual. Ive had a few dominant geldings in the past whom have done the same thing. It's really sad to see the other horses with bite marks but i have always just let them run their course and they do usually come out of it. They just have to figure out their pecking order. I have heard of some extreme cases where they never do come out of it and they are always beating up the others. In this case i would defenitaly try seperation. You said he was pretty new? I would give them a few weeks to figure it out and if it continues or gets worse I would pull hem away from them.

Hope this helps! Good luck!

I have noticed with my horses over the years that when its raining out and they can get to shelter they typically dont go into it (yes they know its there). So honestly unless its really nasty out I wouldnt bother putting them in.

About your aggresive gelding, how long have they been out together? If its a new thing let it run its course. If they have been out for a while and its still like that its not going to change and you might want to consider seperating them.

I am so glad to see everyone saying they leave their horses out! I have 26 horses - all but 2 are out full time. One is a stallion in his own paddock with an stall under cover. The other is a 9mth old colt I got 6 weeks ago. He was blanketed and not prepared for winter. So he stays in unless it is pretty. He is slowly growing soe more hair. Most of mine have the option of a shelter or barn. Some just have trees etc. Even with the shelters, they usually stay out in it. If your horses are aclimated, and have the coat already for the weather, leave them out. When you bring them in and out, blankets, then not, it makes them more siseptable to getting sick. They were born to be out, they can handle the weather. Not to mention they need to roam, graze and move around.
The gelding - The fact that he is new, I would say give it a chance. However, when you keep mares and geldings separate, it is always more quiet on the home front. It is just nature. He may have been bullied in the past, had to fight for food, or something of that nature. I have 2 geldings that are extremely dominant. One would leave marks on all the horses. Drove me nuts, because most of my horses are for sale. Hard to sell horse that are all beat up. I love him though and stuck it out. He has settled way down now. He is still the Alpha, but he does it with body language and rarely contact. He has learned that, in most cases, that is all it takes.
If they are dry lotted for winter, or grained regularly, with little grazing that often makes a difference. If, like 14 of mine they have lots of acreage, and nothing to fight over, they tend to do much better. If they are fighting for food twice a day, that tends to make things more heated. Give him a chance to find his place. Don't get in between them.
If you decide to separate them, he would probably be ok after a couple days. Though horses are herd animals, often some agressive horses would just assume be alone.
You have to just read them, watch their signs and communication, and try to let them work it out. Before you move him and have to pastures, water troughs etc to deal with, see what happens for awhile.
Hope that helps.

As long as your horses are allowed to grow a natural winter coat, they will be fine with a good windbreak and a roof with enough room for everyone. Horses kept under lights or are body clipped will need to come in when the weather gets extreme. A combination of a damp blanket, or coat and a stiff wind can cause the wind chills to drop low enough for some parts to develop frostbite. The tips of the ears mostly. The natural outer layer of hair grows to direct water to run off the coat and the bottom layer of hair will stand up to develop a warm pocket or air. If they can get out of the wind they will be fine under all but the most severe conditions. HAY HAY HAY the digestion of hay generates a great amount of body heat. Be sure you keep a good supply of hay in front of your horses at all times. Hay will help keep them warmer than grain. At night we bring in the horses that are body clipped, and the mares we keep under lights. Days, even the body clipped guys go out. EXCEPTION, Ice storm that develops overnight can make a paddock an injury waiting to happen. Snow and horses with shoes. We try to keep as many barefoot as we can. Those with shoes you have to pack the bottom of their feet with a thick coat of grease. Pads and easy boots may work for some to prevent snowpack.
Your gelding that is causing problems may need to be seperated, or put with one mare he likes. I would be sure to remove his hind shoes in the brief adjustmenttime. It only takes a split second for a flying back hoof to fracture a hock, pastern or other part. It may be best to provide him a paddock next to the others with electric to prevent him from fighting over the fence. Horses like to be with other horses, maybe a small pony in with him. He will not feel the need to take charge of the herd if he has just one smaller friend.
I do not wait more than a few days before I remove a rank horse. I always let the new kid get to know the rest from across a fence, either a gap between the fence large enough to prevent touching, or hot wire. They have very well made, sturdy solar powered fence chargers and wide tape, easy for the horse to see. This is far less expensive than x-rays and sutures or splints. In the long run you may loose the use of a good riding horse waiting for adjustment. Hope it goes well.