Six Flags Great America
crowd calendar.
Tell us when you're visiting and we'll show you the quietest day in your window. The app turns it into an hour-by-hour plan for every day. Built from real wait-time data, updated nightly.
Quietest months we've measured, 2024-2026: June and July, especially Wednesdays. Busiest: October and May.
Updated September 22, 2026. Forecast days refresh nightly.
Past days show measured crowd levels or historical estimates; upcoming days show forecasts. A dash means no crowd estimate, so check park hours before choosing that date.
Quietest months we've measured, 2024-2026: June and July, especially Wednesdays. Busiest: October and May.
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How busy is Six Flags Great America in 2026?
Six Flags Great America doesn't stay one speed all year. Measured across 2024-2026, June and July run quietest, averaging 3.8 out of 10, while October and May push 6.3. Mondays typically run 1.4 levels above Wednesdays, the quietest day of the week.
Event days move the needle too. Mardi Gras days average level 6.4, so check the grid before you commit to one.
Six Flags Great America crowds by month, 2026
Twelve months, one glance. Months still to come are forecasts, partial months count measured days only, and the grid up top has every individual day.
| Month | Avg level | What that means |
|---|---|---|
| January | – | No data |
| February | – | No data |
| March | – | No data |
| April | – | No data |
| May | 5.6 / 10 | Moderate |
| June | 3.8 / 10 | Light |
| July | 3.1 / 10 | Light |
| August | 4.2 / 10 | Light |
| September | 3.6 / 10 | Light (forecast) |
| October | 6.5 / 10 | Moderate (forecast) |
| November | – | No data |
| December | – | No data |
Best days to visit Six Flags Great America in 2026
49% of Six Flags Great America's measured days across 2024-2026 land at level 4 or below. Wednesdays are the most reliable quiet pick. If your dates are flexible, aim for June; if they're locked, the grid above shows exactly where your window falls. Want receipts? See how June 19 played out at level 8, or what a level-1 day looked like on September 20.
Common questions about Six Flags Great America crowds
When is Six Flags Great America least crowded in 2026?
Across the 2024-2026 seasons we've measured, June and July run quietest, averaging level 3.8 out of 10. Within any week, Wednesdays usually post the lowest levels. The calendar above shows every day, so check your exact dates.
How busy is Six Flags Great America on weekends?
Saturdays average level 4.9 and Sundays 4.1, against 4.6 on weekdays, measured across 2024-2026. The busiest day of the week is Monday at 5.3 and the quietest is Wednesday at 3.9.
How accurate is this crowd calendar?
Past days show measured crowd levels where we have them. Upcoming days are forecasts and update nightly.
What do the crowd levels 1-10 mean?
Level 1-2 is quiet, 3-4 is light, 5-6 is moderate, 7-8 is busy and 9-10 is packed. Each level comes from that day's posted wait times across the whole park.
Is the Six Flags Great America crowd calendar free?
Yes. The calendar is free and you don't need an account to browse it. With a free Ride Ready account, you get live wait times, a plan preview with a few rides, and 3 ride alerts per park. Premium adds unlimited day plans with automatic replanning and unlimited alerts.
Plan your Six Flags Great America visit
- Six Flags Great America park guide
- Six Flags Great America touring strategy
- Crowd calendars for every park we cover
- The 2026 Theme Park Crowd Report
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