February, April, May, July, August and December — Dutch, Belgian and German school holidays — the spring krokus and May breaks, the summer holiday, and Winter Efteling in December.
Quietest months
March, June, September and November — March, June, September and November weekdays outside the school breaks.
Local knowledge: Check the Dutch school holiday calendar before booking. The difference between a holiday week and an ordinary Tuesday is larger than anything a paid pass could have bought you.
How this is worked out
Each day starts from how that weekday normally runs at Efteling, learned from our own recorded wait snapshots as they accumulate, and is raised for public holidays and school-holiday periods. It is a forecast of relative busyness, not a promise: a 3 means a day that usually runs quiet for this park, not a guarantee of short lines. The further out a date sits, the more it leans on the weekday pattern alone.
Want the live picture instead? Efteling wait times has today's queues, the hour-by-hour curve and what counts as a normal wait here. Planning a specific day? Open the planner and it will build a route around these crowd levels.