Bahia grass seed can be harvested several times during the year, but it is very important that the grass seed be started to dry within the first two hours after being picked. Otherwise, the decomposition process will start heating up the mass of seeds and can eventually render them nonviable. You will want to know how to dry the seeds before you harvest them.
Remove as much of the extra plant material from the collected seed before you try to dry it. The Bahia seed stems are pretty tough and quite easy to pick out. This will help prevent the pile from heating up from decomposing plant material. You can blow a fan gently over the pile while you are working to blow off some of the lighter matter, and manually pick out the larger particles.
Lay the seeds out on a tray or on a tarp if you harvested a larger quantity of seed. The Bahia seed is quite small and shouldn't be put on a screen unless it is a tight weave. You don't want the layer to be more than a couple inches thick or you will have to move them around several times a day. Place the tray or tarp in a warm room, but out of the elements of the weather.
Blow air gently over the seeds using a fan to help remove some of the moisture. Since the Bahia seed is so fine, it compacts easily and can quickly trap moisture. There is no need to add heat to the air, as they will dry easily without it. The fan should not be so strong as to blow the seeds, just strong enough to move the air.
Shake or stir up the seeds every day for about two weeks. If the room temperature is 70 degrees F or more during this time, the seeds should have dried sufficiently. In areas where humidity is high, you may have to wait a little longer. Typically this is plenty of time for the Bahia seed, since it tends to be smaller and without such a hard outer coat as other grasses.