Out here on the East Coast, ash has always been referred to as the King's Wood because it can be felled, split and burned in a single day. As an earlier post stated, it doesn't hold much moisture. I didn't believe it, but at the time I was working with a large commercial firewood outfit and we split up a few logs of Fraxinus nigra, so the owner and I decided to test out the theory. I brought an arm-full of splits home to throw on the fire.
There was a marginal bed of coals, maybe 1-2", because I was out splitting wood all day and my lovely wife hadn't loaded the stove all day. So, I rolled in with the ash and a cold 40 of Coors light. I threw the ash on the fire, opened the vents and cracked the 40 to watch the show. Sho' nuff about halfway threw the 40, the fresh splits of ash caught fire and burned pretty solid for about, well, about the remaining half of the 40. Sorry, I don't have a more accurate timing mechanism!
After that, I was back to the red oak that I burn about 3-5 cords a year depending on whether Al Gore says there is global warming or not!