See the latest on Inca Trail Permit availability here: Inca Trail Permits
Inca Trail trekking permits are selling exceptionally fast this year. Permits are already sold out through the middle of August, with the first permits available for trips starting on August 23. September and October have plenty of permits available, so if you really want to trek on the Inca Trail you should plan for a fall trip at this time.
Alternatively, there are a number of fantastic treks on non-permitted Inca Trails that offer solitude, Andean scenery, culture, and Inca and pre-Inca ruins that don’t require Inca Trail permits, and are available all summer long. Some of these treks end at or near Machu Picchu, and all can be combined with a visit to Machu Picchu, so don’t postpone your Peru trip just because Inca Trail permits are sold out. Local trekking guides and well-traveled trekkers often feel these other trails are actually more interesting than the famous “Inca Trail.” Check out these treks here: