Unfortunately, without a helper app (IFTTT or Launcher Pro), you can't use location (or event)-based triggers (yet). I'll bet that comes in the next big release. Apple can obviously do geo-fencing since they've done it with Reminders for years.
You can't use IFTTT directly yet, but using the instructions in the tweet below from Federico Viticci, you may be able to.
https://twitter.com/viticci/status/1042042905815384065