Gen 1, Gen 2, and Gen 3 Bee's Endurance stat determines which Zone it can reach. See the chart below for details. 

Genesis Bees can reach all 8 Zones in Universe one.

Training Bee's reach is determined by the player's XP level. See the chart below for details.

Landowners can send their Genesis, Gen 1, Gen 2, and Gen 3 Bees to their own Lands regardless of the Bee's Endurance stat.