State Highway 86 (SH 86) is a 61.47-mile-long (98.93 km) state highway in the U.S. State of Colorado. It runs from Interstate 25 (I-25), U.S. Route 85 and US 87 in Castle Rock, eastward to I-70 and US 40 near Limon. It gives service through eastern Castle Rock to Franktown and then to Elizabeth then from Kiowa to I-70 and US 40.