July, August and October — the summer holiday and Phantom Fall Fest weekends.
Quietest months
May, June and September — May and June weekdays and September weekends.
Local knowledge: The three historic wooden coasters are the reason to come and almost never have a line — the modern steel takes the crowd.
How this is worked out
Each day starts from how that weekday normally runs at Kennywood, 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? Kennywood 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.