[4] In December 2018, McElrea won the $200,000 Mazda Road to Indy Shootout at Wild Horse Pass Motorsports Park to compete in the 2019 U.S. F2000 National Championship.

[5] Joining with Pabst Racing, McElrea claimed four victories, including back-to-back wins at Portland and ultimately finished as championship runner-up after missing out on the title five points to Braden Eves.

[6][7][8] In October 2019, McElrea reunited with Pabst to partake in the Chris Griffis Memorial Test, setting the fastest time in the Indy Pro 2000 category.

[10] His rookie season in Indy Pro 2000 netted him 5th position in championship, with six podiums and a win at the final race of the year at the Grand Prix of St. Petersburg.

[12] In 2022 McElrea achieved three pole positions, two race wins at Mid-Ohio Sports Car Course and Iowa Speedway, and claimed 'Rookie of the Year' honours.