Rookie Riley Herbst burst onto the ARCA Racing Series scene in 2017, driving the No. 18 NOS Energy Drink-UFC Gym Toyota for Joe Gibbs Racing. Herbst saw success early on when he won at Pocono Raceway in his first attempt on the 2.5-mile triangular superspeedway. Herbst also finished 2nd in his next Pocono attempt. Despite not competing in the season-opener at Daytona, Herbst still finished 5th in driver championship standings in 2017. He also earned the 2017 SCOTT Rookie of the Year, defeating Gus Dean for the title by just 4 points, one of the closest rookie battles in series history. In 20 career starts since '17, Herbst earned 6 top-5 finishes and 11 top-10s. Other top finishes for Herbst in 2017 include 2nd at the Road America road course, 3rd at Elko Speedway, 3rd at Madison Int'l Speedway, 5th at Toledo Speedway, 7th at Fairgrounds Speedway Nashville, 7th at Kentucky Speedway, 8th at Talladega Superspeedway, 9th at Kansas Speedway and 10th at Daytona to open the '18 season. Herbst also won the General Tire Pole Award at Elko Speedway in his first attempt on the tour's smallest track. He also led 203 laps overall throughout 2017. NASCAR veteran chief Bootie Barker serves as Herbst's crew chief in the ARCA Racing Series.
Herbst is also coming off a successful 2016 season of competition in the K&N NASCAR Pro East and West series. Under Bill McAnally Racing and Napa Automotive, Riley completed 17 races, recording 7 top-5 and 13 top-10 finishes in the K&N East and West. Herbst also competed in the super late model division, under the Fury Racing banner, with crew chief Jeff Fultz and the guidance of Tony Eury Sr./Jr. He also did double duty as a rookie at Irwindale Speedway in 2015, winning the track championship in the Irwindale Speed Trucks.