Adventure Travel, Inca Trail Trek, Travel Tips, Trekking in Peru When should I start planning my trek? Posted on August 20, 2013 by Layna George Three months in advance at least is ideal for planning a trek. Keep in mind when you want to trek; if it’s in the busy season, it’s best to plan four months or more in advance to be safe. Trekking Tours Layna George Can I buy the Inca Trail permits myself or hike without a guide? Why do I need a permit for the Inca Trail trek?