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Fright Fest 2026 at Six Flags Great America: crowd calendar

19 Sep to 1 Nov 202622 nightsGurnee, Illinois, United States

Fright Fest 2026 at Six Flags Great America runs 19 Sep to 1 Nov 2026 and is forecast moderately busy, averaging 64% crowd level. The quietest night is Sun 1 Nov at 34%, the busiest Sun 11 Oct at 74%.

Quietest night of Fright Fest 2026

Sunday 1 Nov

Fright Fest 2026 is forecast moderately busy at Six Flags Great America, averaging 64% crowd level across its 22 nights. The busiest is Sunday 11 Oct at 74%.

34%crowds
Next bestFri 2 Oct 58%Sat 19 Sep 60%Thu 29 Oct 60%

Across its 22 nights the forecast averages 64% crowd level, which is about a normal day for this park. That is 6 points quieter than the same weeks measured in 2025 (70%). Expect lines to average around 27 minutes park-wide on a typical night.

Fright Fest is an evening event, so the crowd figures above describe the whole day at Six Flags Great America, not the event hours alone. Kids Boo Fest / Tricks and Treats runs alongside it during the day, on the same dates.

Every night, with the forecast

September 2026

  1. Sat1960%~23 min
  2. Sun2061%~24 min
  3. Fri2562%~24 min
  4. Sat2661%~24 min
  5. Sun2761%~24 min

October 2026

  1. Fri258%~22 min
  2. Sat364%~26 min
  3. Sun466%~28 min
  4. Fri969%~29 min
  5. Sat1070%~31 min
  6. Sun1174%~35 min
  7. Fri1672%~32 min
  8. Sat1773%~34 min
  9. Sun1872%~32 min
  10. Thu2263%~25 min
  11. Fri2361%~24 min
  12. Sat2471%~31 min
  13. Sun2572%~32 min
  14. Thu2960%~23 min
  15. Fri3060%~23 min
  16. Sat3169%~30 min

November 2026

  1. Sun134%

The 22 days inside the run that Fright Fest does not operate on are forecast 62% on average.

Quietest 0-15%Quieter 15-35%Typical 35-65%Busier 65-88%Busiest 88-100%

How the same weeks ran in 2025

Between 19 Sep and 1 Nov 2025 the park measured 70% on average over 9 recorded days. The busiest was Sunday 12 Oct at 87%, the quietest Sunday 21 Sept at 48%. These are the same calendar weeks, not necessarily 2025's event dates.

Busiest days, measured

  1. 1Sunday 12 OctLines averaged 54 min87%
  2. 2Sunday 19 OctLines averaged 46 min83%
  3. 3Sunday 26 OctLines averaged 46 min82%
  4. 4Sunday 5 OctLines averaged 42 min80%
  5. 5Monday 13 OctLines averaged 32 min72%

Quietest days, measured

  1. 1Sunday 21 SeptLines averaged 17 min48%
  2. 2Saturday 20 SeptLines averaged 19 min54%
  3. 3Saturday 27 SeptLines averaged 22 min58%
  4. 4Sunday 28 SeptLines averaged 24 min62%
  5. 5Monday 13 OctLines averaged 32 min72%

Dates as published by Six Flags Great America; always check the park's own site before travelling. 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. We score every past forecast against what the queues actually did and publish the result in the crowd forecast accuracy ledger.

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Frequently asked

When is Fright Fest 2026 at Six Flags Great America?

Fright Fest 2026 runs 19 Sep to 1 Nov 2026, on selected dates: 22 nights in total. Dates are as published by Six Flags Great America.

What is the quietest night of Fright Fest 2026?

Sunday 1 Nov is forecast the quietest at 34% crowd level. The next best are Fri 2 Oct (58%), Sat 19 Sep (60%), Thu 29 Oct (60%).

What is the busiest night of Fright Fest 2026?

Sunday 11 Oct is forecast the busiest at 74%. The 8 nights that fall in the October break (16 Oct to 30 Oct) average 67%.

How busy is Fright Fest compared with a normal day at Six Flags Great America?

The event nights average 64% crowd level, about a normal day for this park. The same weeks in 2025 measured 70% on average. The 22 days inside the run that Fright Fest does not operate on are forecast 62% on average.

Do I need a separate ticket for Fright Fest?

Fright Fest runs in the evening, with Kids Boo Fest / Tricks and Treats during the day. Check Six Flags Great America's own site for what your ticket includes on the day you visit.