Subscriptions renew on your Roku account bill date. You can determine what that is and when a channel will renew by doing the following:

• From the Roku home screen, select Channel Store
• Select the channel
• Select “manage subscription”

Using the Instant Replay (12-button) Roku remote control you can:

• Highlight the channel on you home screen
• Press the options (“*”) button on your remote control.
• Select “manage subscription” from the options menu.

You can learn more about your Roku account bill date here.