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 in 2025-2026 (measured + forecast): November and June, especially Wednesdays. Busiest: October and August.
Updated July 13, 2026. Forecast days refresh nightly.
You picked your day. Now plan it.
The app builds your ride-by-ride plan from live waits and forecasts, so you spend the day riding instead of guessing.
Your dates' crowd forecast, emailed.
Drop your email and we'll send your dates' outlook for Six Flags Great America, right to your inbox.
No spam. Walk away whenever you want.
How busy is Six Flags Great America in 2026?
Six Flags Great America doesn't stay one speed all year. In 2025-2026 (measured plus forecast), November and June run quietest, averaging 3.5 out of 10, while October and August push 5.8. Weekends and weekdays run surprisingly close here, so the day of week matters less than the season.
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 in 2026
Twelve months, one glance. 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 | 3.9 / 10 | Light |
| July | – | No data |
| August | – | No data |
| September | – | No data |
| October | – | No data |
| November | – | No data |
| December | – | No data |
Best days to visit Six Flags Great America in 2026
46% of Six Flags Great America's 2025-2026 days land at level 4 or below. Wednesdays are the most reliable quiet pick. If your dates are flexible, aim for November; if they're locked, the grid above shows exactly where your window falls. Want receipts? See how May 15 played out at level 8, or what a level-1 day looked like on June 5.
Common questions about Six Flags Great America crowds
When is Six Flags Great America least crowded in 2026?
Based on our 2025-2026 data (measured plus forecast), November and June run quietest, averaging level 3.5 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?
Weekends at Six Flags Great America average level 4.7 in 2025-2026, versus 4.7 on weekdays. Saturdays are typically the peak. If you can swing a Wednesday, you'll feel the difference in the lines.
How accurate is this crowd calendar?
Every day comes from real wait-time data, not guesswork, and forecast days update nightly.
What do the crowd levels 1-10 mean?
Level 1-2 is quiet, with walk-ons most of the day. 3-4 is light, 5-6 is moderate, 7-8 is busy, and 9-10 is packed, with peak waits several times longer than a quiet day. The levels come from each day's 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. The Ride Ready app is also free to download, with live wait times and free drop alerts. Day plans are a premium feature.
Plan your Six Flags Great America visit
- Six Flags Great America park guide
- Six Flags Great America touring strategy
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- The 2026 Theme Park Crowd Report
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