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Troubleshooting Geofences
For best results, the minimum radius of the geofence should be set between 100 - 150 meters. When Wi-Fi is available location accuracy is usually between 20 - 50 meters. When indoor location is available, the accuracy range can be as small as 5 meters. Unless you know indoor location is available inside the geofence, assume that Wi-Fi location accuracy is about 50 meters.
When Wi-Fi location is not available (for example, when you are driving in rural areas) the location accuracy degrades. The accuracy range can be as large as several hundred meters to several kilometers. In cases like this, you should create geofences using a larger radius.
Is Wi-fi enabled on your device? Wi-Fi should be enabled even though you might not use it. Although not connected Google uses the available Wi-fi accesspoints to determine your location.
How reliable/strong is your cell data connection (no Wi-fi but 3G/4G)? If there is no reliable data connection, geofences might not be triggered. This is because the geofence service depends on the network location provider which in turn requires a data connection.
If you set GPS to power save and reboot your device: how accurate is Google Maps to pinpoint your location? This tests whether your Wi-fi signal and cell tower are reliable enough to determine you location enough. This is how geofence works most of the time.