Go to Dreamcatcher's #41 post,
in your other thread. How cold is too cold?
Look at the picture she posted of how a frost-free pipe should be installed.
I would bet money there is no pea gravel around the frost free (or not enough), the water froze in the pipe and down where the drain hole is.
As someone mentioned, nothing you can do until a good thaw.
1. Shut the water off to the barn
in case something did freeze and crack.
2. If you have a sled of some sort, you're going to have to fill gallon jugs or regular water buckets at the house (use really warm water) and pull it to the barn on the sled.
A 4-wheeled wagon will work or a cart hooked to the 4-wheeler. Don't use the wheel barrow, as it has too much tilt and is too unsteady if you have a lot of snow.
IF you can afford to, you could call in another contractor and have them check your hydrant(s) at the barn but mercy that will be expensive.
For now, you are better off shutting the water off to the barn and carrying water.
If misery loves company, please know there isn't one of us who has lived or still lives in an area where we have dealt with frozen water at the barn. Say a prayer for the folks with large herds of cattle or horses.
The lady who runs another small forum woke up to -30F Sunday, without
the windchill. She is in South Dakota. She stays because her farm had been her grandparents.
Long as you shut off the barn water and get up 45 minutes earlier to do "one more thing" before leaving for work, things will work out. Or make the kids get up and help you:)