Freeze squash with the following steps:
Wash the squash well before slicing and blanching. Once the squash has completed the blanching process, place it in ice water for 5 minutes and drain well.
Place the squash in air-tight freezer bags or containers. Properly stored squash can be kept in the freezer for up to 12 months.
Frozen squash thaws best in the refrigerator. Drain the excess water before cooking.