In 2026, the official advice for the Eiffel Tower is to book exactly 60 days in advance if you want lift tickets to the top floor (le Sommet). Tickets go on sale at 12:00 AM Paris time on the official website and often sell out within minutes for peak dates. If you are willing to take the stairs to the second floor, these tickets are usually released 14 days in advance. For travelers who miss these windows, a high-value "pro-tip" is to join a guided "skip-the-line" tour (like those from Fat Tire Tours) which often have their own reserved ticket blocks. If you are visiting during the peak summer months or school holidays, trying to buy tickets on-site can involve a 2-to-3-hour wait, so early digital booking is the premier way to ensure you don't waste half of your Parisian holiday standing in the Champ de Mars.