We buy direct from a farmer--here the feed stores don't sell hay, so that wouldn't be an option for anyone anyway--and it can be hard to find a good supplier.
Over the years we've looked at a lot of really bad hay--absolutely do not take anyone's word for how wonderful their hay is--go and look at it for yourself! So often when someone says "oh yes, it's wonderful horse hay" it actually is NOT fit for horses...around here this is especially true of round bales but it happens with the small squares too. "Horse hay, oh yes, I'm feeding it to my own horses" is no guarantee, because some people will feed some very bad hay to their horses!
The hay guy we have now is good--he knows how to bale hay so that it will keep in good shape, and he has good quality hay (in terms of type of grass). Up until now he's had mostly alfalfa mix, but this year he says he is going to seed some straight timothy, so we'll be able to get our grass hay from him too.
Here it's gotten very hard to find good grass hay. I was getting some timothy that was nice hay except that it had thistle in it. Then the last load had 20 rotten bales in it. The seller had given a quality guarantee but got mad when I told him there were 20 bales that were no good--said that wasn't possible because another person had bought 500 bales and had only 3 rotten ones...I told him whatever, I know how little some people care about what they feed their horses and perhaps the guy just wasn't too particular, or perhaps he was lucky & didn't get any spoiled ones, but in any case I had 20 that were no good & he was welcome to stop in & look at them & even take them back home--but he didn't want to do that. Of course not, he knew very well I was telling the truth, he just didn't like it!! I didn't pay for those 20 bales but also won't be getting the last 140 bales we were supposed to get from that guy. Which is okay....I did find other grass hay so we will be okay until the new hay crop is ready.
Another thing I have learned is that "not much alfalfa" may mean as much as 50 to 70% alfalfa to some people, while I'll be thinking it means 25% or less....and "mostly brome grass" may very well mean that a few bales have a bit of brome in them while the majority of the bales are 100% fine prairie grass....
Yep, unless you know you can trust the hay supplier to know and be honest about what his hay is really like, don't take his word for it. Go and look for yourself. Even bring a few bales home and open them and try them before committing to buying your year's supply. If the bales are being delivered, inspect each load as it comes--it's quite possible to get a good batch of bales in one delivery and then a later delivery from a different part of the stack could be poorer quality. Perhaps it was baled earlier and was a bit tough at time of baling, or maybe it was from a different field that was cut & baled at a different time. If you're hauling the hay yourself, be vigilant when you're loading bales--again, the entire stack may not be the same quality.
Sometimes it's hard to tell what the hay is like without opening the bale, but if you've gotten some good hay and then come to a section that hasn't kept you'll often notice that the bales are off colored, or they are suddenly extremely heavy or you might notice an off smell--any of these things can indicate that the hay isn't in good shape inside the bales.