If you've ever witnessed a dark, buzzing cloud of bees moving through the air before settling in a writhing mass on a tree branch, you've seen one of nature's most extraordinary events — a honey bee swarm. For the uninitiated it can look alarming, but for a beekeeper, it's a fascinating and completely natural part of the hive's life cycle.
What Is a Swarm?
Swarming is how honey bee colonies reproduce. When a hive becomes overcrowded or the colony is thriving, the old queen leaves with roughly half the worker bees to find a new home. Before she goes, the colony raises new queen cells to ensure the original hive survives.
The swarm typically clusters somewhere nearby — a fence post, a hedge, a tree branch — while scout bees fan out to find a suitable new home. This resting phase can last anywhere from a few hours to a couple of days.
Are Swarms Dangerous?
Contrary to what you might think, a swarm is actually at its most docile. The bees have no hive or honey to defend, and their bellies are full of honey they've loaded up for the journey. Unless provoked, they're remarkably calm and very unlikely to sting.
That said, it's always best to give them space and contact a local beekeeper to collect them safely.
Why Do Bees Swarm?
Several factors trigger swarming:
- Overcrowding — the hive has simply run out of space
- A thriving queen — a productive queen filling every cell is a sign of success, but also a trigger
- Seasonal timing — late spring and early summer (May–July in the UK) is peak swarm season
- Lack of ventilation — a hot, poorly ventilated hive can prompt bees to leave
What Happens to a Swarm?
Scout bees perform one of nature's most remarkable democratic processes — the "waggle dance" — to communicate potential nest sites to the cluster. The colony reaches a consensus and, once agreed, the entire swarm takes flight to their new home.
In the wild, they'll seek out a hollow tree or cavity. In a garden, they might choose a chimney, a wall cavity, or a shed — which is why early collection by a beekeeper is so important.
Watch: Honey Bee Swarm in Action
What Should You Do If You See a Swarm?
- Stay calm — they're not aggressive
- Keep children and pets away — just as a precaution
- Don't spray them with water or insecticide
- Contact a local swarm collector — the British Beekeepers Association has a free swarm collector directory
A Beekeeper's Perspective
At Swabees, swarm season is one of the most exciting times of year. Catching a swarm is a wonderful way to grow an apiary — the bees are healthy, motivated, and ready to build. Every jar of our raw honey and every bar of our beeswax skincare starts with a thriving colony, and sometimes that colony began its journey as a swarm on a warm May afternoon in Lincolnshire.
Fascinated by bees? Explore our range of handmade beeswax skincare and raw honey — crafted with love from our own hives.