hahaha...from the FAA rules:
CHAPTER 2. RUNWAY LENGTHS FOR SMALL AIRPLANES WITH MAXIMUM CERTIFICATED TAKEOFF WEIGHT OF 12,500 POUNDS (5,670 KG) OR LESS
201. SMALL AIRPLANES WITH APPROACH SPEEDS OF LESS THAN 30 KNOTS. Airplanes with approach speeds of less than 30 knots are considered to be short takeoff and landing or ultra light airplanes. Their recommended runway length is 300 feet (92 meters) at mean sea level. Runways located above mean sea level should be increased at the rate of 0.03 x airport elevation above mean sea level to obtain the recommended runway length at that elevation.