MLS preseason begins in January, approximately 6-8 weeks before the regular season opener. Teams hold training camps, often in warm-weather locations, and play preseason friendlies against other MLS clubs, USL teams, and sometimes international opponents.
Preseason is when coaches evaluate new signings, test tactical approaches, and build fitness. Roster decisions are made during this period, with some players being waived or loaned to make room for new additions.