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Six Flags Great America crowd predictor

September 2026Gurnee, Illinois, United States

Six Flags Great America is typically moderately busy in September, averaging 53% crowd level. The quietest day is Fri 4 Sep at 5%, and the busiest is Mon 7 Sep at 72%.

Best day left in September

Tuesday 15 Sept

September 2026 is typically moderately busy at Six Flags Great America, averaging 53% crowd level. The busiest is Monday 7 Sept at 72%.

53%crowds
Next bestThu 17 Sept 53%Fri 11 Sept 54%Wed 16 Sept 54%

Six Flags Great America is very quiet today, at around 8% crowd levels, and moderately busy tomorrow. This weekend is looking moderately busy.

This crowd predictor forecasts daily crowd levels for Six Flags Great America through 2026.What the % means

The number is how full the park is: how long the queues run on its main rides in the middle of the day, on one scale for every park (50% is about a 17-minute queue, 70% half an hour, 90% an hour), or, where the park sells dated tickets, the share of its capacity sold if that is higher. The word beside it (Quietest to Busiest) compares the day with this park's own history, so a small park can be at its busiest on a day that is still short queues. The lower the number, the shorter the queues, so pick a quiet day and ride more.

Daily crowd levels and opening hours for Six Flags Great America, September 2026
MonTueWedThuFriSatSun
129%Quieter221%Quieter325%Quieter45%Quietest5pm - 11pm553%Quieter19 min lines10:30am - 9pm671%Busier31 min lines10:30am - 9pm
772%Busier33 min lines10:30am - 8pm8Closed9Closed10Closed1154%*QuieterEst.20 min lines5pm - 11pm1260%*TypicalEst.23 min lines10:30am - 6:30pm1358%*TypicalEst.22 min lines10:30am - 8pm
1455%*TypicalEst.20 min lines1553%*QuieterEst.19 min lines1654%*QuieterEst.19 min lines1753%*QuieterEst.19 min lines1857%*TypicalEst.21 min lines1961%*TypicalEst.24 min lines2060%*TypicalEst.23 min lines
2156%*TypicalEst.20 min lines2258%*TypicalEst.22 min lines2357%*TypicalEst.21 min lines2456%*TypicalEst.20 min lines2558%*TypicalEst.22 min lines2661%*TypicalEst.24 min lines2764%*TypicalEst.26 min lines
2857%*TypicalEst.21 min lines2956%*TypicalEst.20 min lines3054%*QuieterEst.20 min lines
  1. Tue1Hours unavailableSummer29%Quieter
  2. Wed2Hours unavailableSummer21%Quieter
  3. Thu3Hours unavailableSummer25%Quieter
  4. Fri45pm - 11pmSummer5%Quietest
  5. Sat510:30am - 9pmSummer53%Quieter19 min lines
  6. Sun610:30am - 9pmSummer71%Busier31 min lines
  7. Mon710:30am - 8pmSummer72%Busier33 min lines
  8. Tue8Hours unavailableSummerClosed
  9. Wed9Hours unavailableSummerClosed
  10. Thu10Hours unavailableSummerClosed
  11. Fri115pm - 11pmSummer54%*Est.Quieter20 min lines
  12. Sat1210:30am - 6:30pmSummer60%*Est.Typical23 min lines
  13. Sun1310:30am - 8pmSummer58%*Est.Typical22 min lines
  14. Mon14Hours unavailable55%*Est.Typical20 min lines
  15. Tue15Hours unavailable53%*Est.Quieter19 min lines
  16. Wed16Hours unavailable54%*Est.Quieter19 min lines
  17. Thu17Hours unavailable53%*Est.Quieter19 min lines
  18. Fri18Hours unavailable57%*Est.Typical21 min lines
  19. Sat19Hours unavailable61%*Est.Typical24 min lines
  20. Sun20Hours unavailable60%*Est.Typical23 min lines
  21. Mon21Hours unavailable56%*Est.Typical20 min lines
  22. Tue22Hours unavailable58%*Est.Typical22 min lines
  23. Wed23Hours unavailable57%*Est.Typical21 min lines
  24. Thu24Hours unavailable56%*Est.Typical20 min lines
  25. Fri25Hours unavailable58%*Est.Typical22 min lines
  26. Sat26Hours unavailable61%*Est.Typical24 min lines
  27. Sun27Hours unavailable64%*Est.Typical26 min lines
  28. Mon28Hours unavailable57%*Est.Typical21 min lines
  29. Tue29Hours unavailable56%*Est.Typical20 min lines
  30. Wed30Hours unavailable54%*Est.Quieter20 min lines
Quietest Among the quietest days at this parkQuieter Quieter than a normal day hereTypical A normal day for this parkBusier Busier than a normal day hereBusiest Among the busiest days at this park

Lines at Six Flags Great America average 22 minutes across 45 recorded days, and 40 minutes on the busiest of them. A high score means busy for this park.

Crowd levels are modelled from this park's own recorded queue times, school and public holidays, day of the week and the weather forecast, and may not always be right. Opening hours come from the park and can change. Always check the park's own site before travelling. We score every past forecast against what the queues actually did and publish the result in the crowd forecast accuracy ledger.

Seasonal events at Six Flags Great America

  • Fright Fest runs 19 Sep to 1 Nov 2026, on 22 selected nights. Evening event.
  • Kids Boo Fest / Tricks and Treats (daytime family Halloween) runs 19 Sep to 1 Nov 2026, on weekends.
  • Oktoberfest runs 19 Sep to 1 Nov 2026, on weekends.

Event nights are among the busiest of the season. See the crowd calendar before you book.

Dates as published by the park. Always check the park's own site before travelling.

September 2026October 2026November 2026December 2026January 2027February 2027March 2027April 2027May 2027

Frequently asked

How busy is Six Flags Great America today?

Six Flags Great America is predicted to be very quiet today, at around 8% crowd levels. Lower percentages mean shorter queues.

How busy will Six Flags Great America be tomorrow?

Six Flags Great America is predicted to be moderately busy tomorrow, at around 54% crowd levels.

Is Six Flags Great America busy this weekend?

This weekend Six Flags Great America is looking moderately busy, at around 59% crowd levels on average.

When is the quietest day to visit Six Flags Great America in September 2026?

Friday 4th is predicted to be the quietest day to visit Six Flags Great America in September 2026, at around 5% crowd levels.

When is Six Flags Great America busiest in September 2026?

Monday 7th is predicted to be the busiest day at Six Flags Great America in September 2026, at around 72% crowd levels.

How busy is Six Flags Great America in September 2026?

On average, Six Flags Great America is moderately busy in September 2026 - around 48% crowd levels. Weekdays are usually quieter than weekends.

Is Six Flags Great America busier on weekends?

Yes - Six Flags Great America is typically busier at weekends than midweek in September 2026. Visit on a weekday for shorter queues.

What is the best time to visit Six Flags Great America?

The best time to visit Six Flags Great America is on its quietest predicted days - Friday 4th is the quietest in September 2026 (about 5%). Arriving at opening also means the shortest waits.

Is there a crowd predictor for Six Flags Great America?

Yes. This page is a free Six Flags Great America crowd predictor: it forecasts how busy every day will be through 2026, on a scale where 50% is about a 17-minute queue on the main rides and 90% is about an hour. The lower the number, the shorter the queues.

Six Flags Great America live wait times todayBest time to visit Six Flags Great AmericaSix Flags Great America ride reliabilityPlan your day at Six Flags Great America