Not all horses run their best on different types of tracks, and that can make a big difference in handicapping and betting outcomes. Tracks essentially come in two types. One is a dirt track and the other a turf track that is covered with grass. Dirt tracks can be much faster than turf tracks when conditions are dry but become much slower in the rain or when otherwise wet. Although turf tracks can be slower than dirt tracks when the weather is perfect and the track is dry, but turf tracks don’t slow down as much in the rain or when wet due to the grass draining the water and holding the surface together.