| 01.05 | |  The Showdown @Angler's Ridge | 1 | |
| 01.05 | |  Internacional MTB Series #2 - Pará de Minas | 2 | |
| 01.05 | |  Rye Bike Festival / Rye Terrengsykkelfestival XCO U19 | 3 | |
| 01.05 | |  International Cup Race #3 - Cohav Yair | 2 | |
| 02.05 | | Rye Bike Festival / Rye Terrengsykkelfestival XCO | 1 | |
| 02.05 | |  Gigante Small XCM | 2 | |
| 02.05 | | Shimano Supercup Massi Vitoria | 2 | |
| 02.05 | |  Bike Marathon Garda Trentino | 1 | |
| 02.05 | |  Klippingracet | 2 | |
| 03.05 | |  XCO Gradina | 2 | |
| 03.05 | |  Greek National Championships - XCM | CN | |
| 03.05 | |  Shimano MTB Liga #2 - Rold | 2 | |
| 03.05 | |  XCO Krizni put Posedarje | 2 | |
| 06.05 | |  sani2c Race | S2 | |
| 08.05 | | UCI Mountain Bike Continental Series - Englewood Open P/B Trek XC | CS | |
| 09.05 | |  Czech MTB Cup - Vimperk | 1 | |
| 09.05 | |  XIV. Csömör Nagydij | 2 | |
| 09.05 | | HERO UCI Cross-country Marathon World Cup - Capoliveri | CDM | |
| 09.05 | |  Copa Argentina XCO #3 - San Juan | 2 | |
| 09.05 | |  Portugal Cup XCO - Jamor | 2 | |
| 09.05 | | UCI Mountain Bike Continental Series - Gothenburg MTB Race - XCO | CS | |
| 09.05 | |  7. Wilder Kaiser MTB Race | 1 | |
| 10.05 | | Ispaster Green Series XCO | 2 | |
| 10.05 | |  Yason Serbia Epic Fruškogorski Maraton Ivan Davosir | 2 | |
| 10.05 | |  Lloyds National MTB Cross Country Series #3 - Tong | 1 | |
| 14.05 | | Transgrancanaria Bike | S2 | |
| 15.05 | | Huskvarna MTB Tour | 1 | |
| 16.05 | |  Sp XCO Bratislava | 3 | |
| 16.05 | |  International MTB Bundesliga - Heubacher Mountainbikefestival | HC | |
| 16.05 | | Italia Bike Cup - Courmayeur MTB Event | 1 | |
| 16.05 | |  American Series Costa Rica XCC | 3 | |
| 16.05 | | UCI Mountain Bike Continental Series - American Series Costa Rica XCO | CS | |
| 16.05 | |  Mauricius National Championships - XCC | CN | |
| 16.05 | |  Lithuanian National Championships - XCM | CN | |
| 16.05 | | Tessuti Sport Bike Race | 2 | |
| 16.05 | | La Rioja Bike Race | 2 | |
| 17.05 | |  Jura Bike Marathon | 1 | |
| 17.05 | | G.P. Internacional XCO Penas de Rodas | 2 | |
| 17.05 | |  28. Kamniški Kros | 1 | |
| 17.05 | | Costa Degli Etruschi Epic | 2 | |
| 17.05 | | Serbia Epic Požarevac XCO | 1 | |
| 17.05 | |  3 Nations Cup - MTB Topcompetitie Langdorp | 2 | |
| 22.05 | | UCI MTB World Cup XCO - Nove Mesto Na Morave | CDM | |
| 23.05 | |  UCI Mountain Bike Continental Series - Coupe de Japon MTB Yawatahama | CS | |
| 23.05 | | Vulkan-Race Gedern - Internationale Bundesliga | 2 | |
| 23.05 | | Mauricius National Championships - XCO | CN | |
| 23.05 | | Coupe de Japon MTB Yawatahama International Mtb Race | 3 | |
| 23.05 | | Mauricius National Championships - XCM | CN | |
| 24.05 | | Italian National Championships - XCM | CN | |
| 24.05 | | South African National Championships - XCM | CN | |
| 24.05 | | Barakaldo Green Series XCO | 2 | |
| 24.05 | | Croatian National Championship - XCM | CN | |
| 24.05 | |  Roc Laissagais | HC | |
| 29.05 | |  African Continental Championships - XCC | CC | |
| 29.05 | | International Cup Race #4 - Misgav Forest | 2 | |
| 29.05 | | Israeli National Championships - XCO | CN | |
| 29.05 | | African Continental Championships - XCO | CC | |
| 29.05 | | CIMTB #2 XCO - Araxá | 1 | |
| 30.05 | | Bike Marathon | 2 | |
| 30.05 | |  UCI Mountain Bike Continental Series - Triada Mtb Cheile Grădiștei - XCO | CS | |
| 30.05 | | Internationaler Raiffeisen Österreich Grand Prix | 1 | |
| 30.05 | |  Sherbrooke Canada Cup - XCO | 1 | |
| 30.05 | |  Muszynianka Poland Cup Puchar Polski MTB XCO | 1 | |
| 30.05 | | 3 Nations Cup - MTB Festival Vlaanderen | 1 | |
| 30.05 | | MTB French Cup XCO - Saint-Quentin-en-Yvelines | HC | |
| 31.05 | | Monselice In Rosa MTB | 2 | |
| 31.05 | | Skoda Swiss Bike Cup - Savognin | 1 | |
| 31.05 | | Serbia Epic Mionica "Stazama Vojvode Živojina Mišića" | 2 | |
| 31.05 | |  HERO UCI Cross-country Marathon World Cup - Sant Julià De Lòria | CDM | |
| 31.05 | | Shimano MTB Liga #3 - Varde | 2 | |