Holiday periods strongly effect the number of people who visit a theme park and the length of queues for attractions. Here's a list to help you choose when to visit a US theme park and avoid the busy peak times:

Lowest Attendance:

• January (except New Year's Day) until just prior to Presidents' week in February
• The week following Labor Day until just prior to Thanksgiving week
• The week following Thanksgiving until the week prior to Christmas

Moderate Attendance:

• After Presidents' week in February through early March
• Late April through early June (except Memorial Day weekend)
• The first part of Thanksgiving week

Highest Attendance:

• Presidents' week in February
• Mid-March through Late April ("Spring Break")
• Memorial Day weekend Mid-June through Labor Day
• Thanksgiving Day and weekend
• Christmas week through New Year's Day