The Amgen Tour of California announced the selection of 15 men's WorldTour teams and four U.S.-based Professional Continental teams for the 2018 race, held May 13-19. The women's WorldTour race from May 17-19 will be comprised of 15 teams, including seven teams from the U.S.

Men

• AG2R La Mondiale (FRA)
• BMC Racing Team (USA)
• BORA-hansgrohe (GER)
• Hagens Berman Axeon Cycling Team (USA)
• Holowesko|Citadel p/b Arapahoe Resources (USA)
• Mitchelton-SCOTT (AUS)
• Quick-Step Floors (BEL)
• Rally Cycling (USA)
• Team Dimension Data (RSA)
• Team EF Education First-Drapac p/b Cannondale (USA)
• Team KATUSHA ALPECIN (SUI)
• Team LottoNL-Jumbo (NED)
• Team Sky (GBR)
• Team Sunweb (GER)
• Trek-Segafredo (USA)
• UAE Team Emirates (UAE)
• UnitedHealthcare Pro Cycling Team (USA)

Women

• Astana Women’s Team (KAZ)
• BePink (ITA)
• CANYON//SRAM Racing (GER)
• Hagens Berman | Supermint Pro Cycling (USA)
• Mexican National Team (MEX)
• Rally Cycling (USA)
• Swapit/Agolico Cycling Pro Team (MEX)
• Team Illuminate (USA)
• Team Sunweb (NED)
• Team TIBCO-Silicon Valley Bank (USA)
• Trek–Drops (GBR)
• TWENTY20 Pro Cycling p/b Sho-Air (USA)
• UnitedHealthcare Pro Cycling Team (USA)
• USA Cycling National Team (USA)
• Wiggle High5 Pro Cycling (GBR)