It depends on where you're subscribing. Please see below.

Subscribing Directly with AMC

When you subscribe at www.amcplus.com and complete your sign-up there, a 7-day trial is available.
Note: On some limited-time promotional discounts, a trial may not be included.

Subscribing Through Apple, Amazon Prime or Roku

Currently each of these providers is offering a 7-day trial, but make sure to check during your sign-up process or contact their support team if you have further questions.

Subscribing Through a TV provider

Visit your preferred provider's website for free trial info.