Swarm season in Texas: when, where, and what to expect

People think bees swarm in summer. They don’t, mostly — at least not in Texas. We swarm early.

If you’re in the DFW Metroplex, here’s the calendar to watch.

March: the starting gun

As soon as we get a few consecutive 70°F days — usually late February, solidly by mid-March — the strong colonies that survived winter start gearing up. You’ll see increased foraging activity, orientation flights on warm afternoons, and eventually, the first swarms of the year.

What triggers a swarm is simple: the colony is out of room. The queen has been laying, the workers have been building, and suddenly the box (or wall cavity, or tree hollow) is full. Rather than stop growing, the colony splits. The old queen takes half the workers and leaves. The remaining half rears a new queen.

March is when we get the most “swarm on my fence” calls. These are the easiest removals — no structural work, just a quick scoop.

April–May: peak season

This is when swarms are most visible and most common. You’ll see them:

• Hanging off low tree branches
• Clustered on fence posts
• Balled up on a mailbox or playset
• Occasionally in less ideal spots — eaves, soffits, vents

This is also when structural cavities get colonized. If a scout finds a good spot on your house — a void in the brick, a gap in the soffit, the space behind a shutter — the whole swarm moves in within a few hours. Now you’ve got a hive, not a swarm.

This is the window to act fast. A swarm on a fence post is 30 minutes of work. A hive in a wall is a half-day job plus carpentry.

June: winding down

The rate slows. Late-season swarms still happen, but the strongest colonies have already split. What we see more in June is absconding — colonies that picked a bad spot earlier and decide to leave — and small secondary swarms called afterswarms.

July–February: mostly quiet

Bees don’t swarm in Texas heat. They’re focused on keeping the hive cool, making honey, and getting ready to overwinter. You’ll still see bees — foragers working flowers, water collectors on your pool deck — but not swarms.

The exception: warm winters can kick off early swarms in February if the trigger conditions hit. We had a client in Frisco last February who thought a swarm was impossibly early. It wasn’t — just unusually timed.

What to do if you see a swarm

1. Don’t spray. (Covered in why we don’t spray.)
2. Take a photo from a few feet away.
3. Note the location — “on a low branch in the back yard” vs. “near the eaves of the house” is a very different urgency level.
4. Call us.

Swarms that are just clustered on something temporary can wait a few hours. Swarms that look like they’re investigating your house cannot. We can tell the difference from a photo.

And yes — we work seven days a week during swarm season. Bees don’t check calendars. Neither do we.