Yes, surprisingly, you can freeze it! Place the salsa in an airtight freezer bag and remove any excess air. Lay it flat, and put it in the freezer until it’s frozen. It will last 1-2 months.  To thaw, place it in the fridge overnight. It will thaw out fairly quickly and should look and taste great. It may not be quite as vibrant as when you first made it, but it will still be wonderful.