SH 27 begins in the town of Oakley and leaves the center of town on Center Street, heading due north. The highway makes a slight bend to the northeast before continuing north and entering the town of Burley as Overland Avenue. SH 27 intersects U.S. Route 30 (US 30) and runs concurrently with Interstate 84 Business (I-84 Bus.) as it leaves the town, heading north before turning northeast and intersecting I-84, where I-84 Bus. ends. The road continues north as 600 West Road, where it ends in the town of Paul at SH 25.