United Kingdom

The premier class of world motocross. Nineteen Grands Prix across five continents decide the MXGP and MX2 world titles, with each round run as a Saturday qualifying race followed by two Sunday motos.

Supercross as a travelling world championship. Six single-night Grands Prix in stadiums across five continents decide the WSX and SX2 world titles, each run as a one-day show rather than a race weekend.

The UK's premier ACU time-card enduro championship, run directly by the ACU (not a regional Centre) across six rounds touring England, Wales and the Isle of Man.

The UK's premier motocross championship, run directly by the ACU (not a regional Centre) across eight rounds touring England, Scotland and Wales.

The UK's elite ACU motorcycle trials championship, established in 1950 and run directly by the ACU (not a regional Centre) across four double-header weekends touring England.

The ACU Eastern Centre's regional motocross championship, run across Essex, Suffolk and Norfolk clubs. Wakes Colne (Halstead & DMCC), Blaxhall (Woodbridge & DMCC) and Lyng (Norwich Viking MCC) each host twice across the season.

All-island (Youth + Adult, joint race weekends) motocross championship sanctioned by Motorcycling Ireland/MCUI and administered by MRA Ireland. All 6 rounds have 2026 dates, but only Rounds 5-6 have a venue, both in Northern Ireland; Rounds 1-4 name Motorcycling Ireland as promoter with no venue at all. Despite the all-island 'Irish' name, every round with a known venue runs in Northern Ireland, on the same MRA Ireland calendar as MRA's own Ulster-only championships.

A brand-new, ACU-affiliated youth motocross club launching for the 2026 season, covering the ACU Mid Wales Centre area (Powys) and the Shropshire border. Runs a five-round Winter Stubblecross Championship over stubble fields (Jan-Apr), rolling straight into a five-round Summer Series on permanent tracks at Poolquay, Castle Caereinion and Pen y Bont, and finishing with a standalone Welsh Champion Shootout in August. Youth-only: Autos through 125/250F. Of the ACU Centres covering Cheshire & North Wales, Cornwall, East South Wales, Mid Wales and the North East, Mid Wales is the only one whose Centre championship is motocross. The other four run Trials, and in Cornwall's case grasstrack and track racing.

The South Eastern Centre Motocross Combine (SEMX), a grouping of local ACU adult motocross clubs (G.E.S.T. Hastings MCC, Mid Sussex MCC, Crawley MCC and Sidcup & District MCC per the Facebook group's own description) that runs a joint local championship, credited on the centre's own rules page for awards. SEMX has no site or fixtures list of its own: the operating club, Sidcup & District MCC, runs the calendar at its own track, Canada Heights, and bills it as the 'SEMX & Sidcup MCC Championship'. Four rounds run in 2026, numbered 1-3 plus a September final, with Aug 23 as 'Round 3'. The September 6 finale is combined with the ACU British Sidecarcross Championship on the same day. A July 12 British Motocross Championship (MXGB) round also uses Canada Heights, but it is not a SEMX round.

Scotland's national-level motocross championship, licensed through SACU (one of the ACU's regional Centres, running its own rulebook) and organized around Scotia Motocross Club. The SACU's own supplementary regulations and the published previews disagree on round dates from round 3 onward and on the exact round count, so the weekends listed are the ones with a settled date and venue, shown without round numbers. Two further rounds, one in Apr and a date-only one in Sep, have no venue named.

The ACU Southern Centre's Hampshire motocross championship, revived for 2026 after lapsing in recent prior years. Organizers restarted it with four rounds across the county's clubs.

Northern Ireland's Ulster adult motocross championship, run by MRA Ireland under the Motor Cycle Union of Ireland (MCUI), a separate governing body from the ACU that licenses the rest of GB motocross. Six rounds run in 2026 (Apr 6, May 4, May 23, Jun 20, Aug 15, Sep 19), but five of them are still "not yet announced" on venue; only Round 6, at Tinkerhill, has one.

Northern Ireland's Ulster youth (18-and-under) motocross championship, run by MRA Ireland under the Motor Cycle Union of Ireland (MCUI). Six rounds plus a reserve date run in 2026, with venues published for Rounds 2-6. 'Ulster' is the nine-county historic province rather than a political boundary, so one round (Round 4, Errigal MCC) is held across the border in Buncrana, Co. Donegal, Republic of Ireland, while the rest run in Northern Ireland. Round 1 and the reserve date have dates but no venue.