The name here has to do with the field beyond the fence and not the cache. At the time of placement there was hay bails. You might find cattle here? Who knows. Hopefully you find the cache hanging in the tree!
ABOUT THE TRAIL:
There are generally well over 50 caches along the trail. This is no power trail as many of the hides are different in type, size, difficulty and terrain. If you want to know where to park or get food or a bathroom along the trail you need to check out GC4Q1H2 (Bike Trail - Welcome to the Trail). It is loaded with valuable information. I have chosen to list it all on one cache only to help in maintaining it and not loading you up with the same way points over and over again. There is also a bookmark list that has all the caches along the trial listed.