Yes, you can extend your Snowbird Plan with only a month.
Important: You must have a currently active Snowbird Talk+Text+Data or Snowbird Talk+Text in order to extend. If your Snowbird Plan has expired, there is no way to extend the plan.
Each Snowbird extension includes 4GB of 4G LTE data. This data will not be available until the start of the extended month. This is not an option to add more data to your currently active Snowbird plan.
To add an extra month to your Snowbird Plan, log in to your Roam Mobility account, navigate to My SIMs and follow the instructions below:
Step 1: Click Details next to the SIM with the active Snowbird Plan

Step 2: Click Extend Month beside the plan you'd like to add an additional month to

Step 3: Proceed through the checkout and complete your purchase

When done, a Snowbird plan matching your original plan (Talk+Text+Data or Talk+Text) will automatically be scheduled to begin on the last day of your current, active Snowbird plan.

Note: At this time you will only be able to add one month to your current Snowbird Plan. If you'd like to extend your Snowbird plan for longer than just one month, you must repeat the steps above while your Snowbird top up plan is active.