05/02/2026
That bumblebee flying low and slow along your foundation isn't foraging. She's house-hunting.
A queen bumblebee in late April has already mated, already hibernated through winter, and already emerged. She's been feeding on early flowers for a few weeks, building her fat reserves back up. Now she needs a nest site. And she's being extremely picky.
She flies low — inches off the ground — in a methodical zigzag along walls, foundations, rock borders, and garden edges. She investigates every hole, crack, and gap. She goes into some, backs out, moves on. She's checking cavity size, drainage, insulation, and entrance concealment.
What she's looking for: an abandoned mouse burrow. Underground, dry, insulated with old mouse bedding, with a tunnel entrance small enough to defend. Most bumblebee nests in suburban yards are in former mouse holes under sheds, along foundations, in old stone walls, or in undisturbed garden borders.
When she finds one, she moves in alone. She builds a small wax cup, lays the first batch of eggs, and incubates them with her own body heat — vibrating her flight muscles to generate warmth. She does everything herself for the first two weeks. Then the first workers emerge and the colony builds.
🔎 What to do if you see one:
- Don't swat. She's not interested in you. She's interested in the gap between your patio stones.
- Don't block holes along your foundation. That may be the entrance she chose last year or is evaluating now.
- If you know where a bumblebee nested last year, leave that area undisturbed. Queens sometimes return to the same site.
The zigzag along your wall isn't random. It's a real estate search.
She's choosing where an entire colony will be born 🐝
