Do you have rafters or overhead beams in your garage? Outta sight, outta mind, and they will dry very well there. Personally, I wouldn't store them outside under the house, even if you did get them off the ground. Also, DO NOT store them over a heat vent! They will dry too quickly, or very unevenly, and will warp and check. I store my staves in the basement, in a storage room which is temp and humidity controlled.