The "International Signing Period" (ISP) extends from July 2nd through June 15th of the following year. No international player can be signed during the period of time extending from June 16th through July 1st.
Any individual who is age 17 or older, has not previously signed an MLB or minor league contract, resides outside the U. S., Canada, and Puerto Rico, and has not been enrolled in a high school or college in the U. S., Canada, or Puerto Rico within the previous year, can be signed during the "International Signing Period." Also, a 16-year old international player can be signed if the individual will turn 17 prior to September 1st or prior to the conclusion of the regular season of the minor league club to which the player is assigned (whichever comes first).