Skaters who reached the age of 13 by July 1, 2007 but had not turned 19 (singles and females of the other two disciplines) or 21 (male pair skaters and ice dancers) were eligible to compete on the junior circuit. Unlike the senior ISU Grand Prix of Figure Skating, skaters for the Junior Grand Prix are entered by their national federations rather than seeded by the ISU. The number of entries allotted to each ISU member federation is determined by their skaters' placements at the previous season's World Junior Figure Skating Championships in each respective discipline.
For the 2007–2008 season, in singles, the five best placed member nations at the 2007 World Junior Figure Skating Championships could enter two skaters in all eight events. Member nations who placed sixth through tenth could enter one skater in all eight events. Member nations with a skater who had qualified for the free skate at Junior Worlds may enter one skater in seven of the events. Member nations who did not qualify for the free skate but placed 25th through 30th in the short program could enter one skater in six of the events. All other nations could enter one skater in five of the events.
In pair skating, member nations could enter up to three teams per event. The host nation is allowed to enter as many pair teams as it wishes. Pairs were contested at four events out of eight.
In ice dancing, member nations could enter one dance team per event. Member nations who placed in the top five at the 2007 Junior Worlds could enter a second dance team.
The host country was allowed to enter up to three skaters or teams in singles and dance in their event, and there were no limit to the number of pairs teams.