My horse has not been turned out for a week and half due to bad weather?

My ex racehorse hasn't been turned out for a week and half because of really really bad, icy, hard fields. We have just moved to a new yard, too, just yesterday because our old yard had no good turnout. I am now very, very worried to turn him out tomorrow because I know he is going to go crazy when I put him out and I'm worried in case he hurts himself. Would should I do? He needs to be out asap and I am just putting it off because I'm worried he will injure himself. Just last week my friends horse broke his leg from galloping through the field and falling over. I don't want this to happen to my boy. Help?