The bees were discovered by a fruit farmer who was concerned after he found a hive with bees that were abnormally aggressive.
The Mesa County Health Department said the bees were sent for testing. When the positive result came back, the hive was destroyed.
Officials say this is the farthest norther Africanized honey bees have been found. It had been believed the bees could not survive harsh winters, but these bees survived this past winter.
Africanized honey bees are sometimes referred to as killer bees. Their venom is not more potent than the common European bee, but they can be a threat to people or animals if they swarm.