Arizona

The biggest indoor dirt bike series in the world: seventeen Saturday nights in NFL stadiums from Anaheim in January to the Salt Lake City finale in May. The 250SX class splits into East and West regions that meet only at the Showdown.

The national, top-tier arenacross championship in North America, promoted by AX Promotions under AMA sanction and recognized by FIM North America, with rounds across the US and Canada each winter.

The biggest amateur race in the world, and the one every American pro has ridden. Six days at Loretta Lynn's Ranch in Tennessee, 1,500+ riders across 36 classes, all of whom earned their spot through a nationwide qualifying process.

Local Saturday-club points series at Arizona Cycle Park, split into a Spring and Fall block of 4 rounds each (8 total in 2026), best-6-motos scoring, 3-of-4-round minimum per block to qualify for series overall. This 'SMX' stands for 'Saturday MotoCross Racing' at this one track and is unrelated to the national Monster Energy SMX World Championship.

Night-racing points series on Arizona Cycle Park's National Night Track, 3 rounds, 2-moto format with best-6-motos scoring; riders must race all 3 rounds to qualify for series overall.

Six-round Grand Prix-style series run by Grassroots Promotions/Grassroots MX (same promoter as the sibling motocross-only RMX Series) across Arizona, Idaho and Utah, presented by title sponsor MSR and Rocky Mountain ATV/MC. Each round combines the host venue's full motocross track with 4-6 miles of prepped off-road course. Rounds 1-3 are the regular season; Rounds 3-6 are double-points 'Playoff' rounds, with Round 3 (Sat) and Round 4 (Sun) forming the back-to-back 'Dynamite Grand Prix' doubleheader weekend at Cache Valley MX. Round 1/6's promoted 'Mesquite, NV' branding sits directly on the AZ/NV line; the venue's street address is in Littlefield, AZ. It is a self-contained 6-round points championship with its own results/points table (resultsmx.com) and AMA #1 series plates. Some listings print a different 'Round N' on these same events, counting through Grassroots MX's whole combined Western calendar (Moto86 Series, RMX Series, Grassroots Off-Road, Loretta Lynn area qualifiers and standalone signature races like the AMA Thanksgiving Classic all together); those numbers are not this series' round order.

Regional 8-round AMA-featured amateur/pro motocross championship series run by Grassroots Promotions/Grassroots MX across Nevada/Arizona, Utah, Idaho and Wyoming, presented by title sponsor Rocky Mountain ATV/MC. State-championship rounds are folded into the schedule for Wyoming, Idaho and Utah. Round 1's promoted 'Mesquite, NV' branding sits directly on the AZ/NV line. Its published street address (970 E Peppermill Palms Blvd) is in Littlefield, AZ. The series also runs a season-ending, non-points 'Celebration of Champions' awards event, with no date set yet.