Queen Timeline Calculator: Emergence, Mating and First Eggs
Bee math is simple and easy to lose track of: 16 days from egg to a new queen, another week before she flies to mate, another week or two before the first eggs. Open the hive at the wrong moment and you can lose a virgin queen; wait too long and you're into laying workers. Tell the calculator what happened and when, and it gives you every date that matters, which days to stay out of the hive, and the day to stop waiting and act.
Tool Queen Timeline Calculator
The bee math behind the dates
| Stage | Queen | Worker | Drone |
|---|---|---|---|
| Egg | 3 days | 3 days | 3 days |
| Larva (open cell) | 5½ days (capped day 8–9) | 6 days (capped day 9) | 6½ days (capped day 10) |
| Pupa (capped) | 7½ days | 12 days | 14 days |
| Emerges | Day 16 | Day 21 | Day 24 |
| Then | Mating flights days 5–7 after emergence; laying 2–3 weeks after emergence | Nurse bee ~3 weeks, forager after | Sexually mature ~12 days after emergence |
A queen's timeline is fixed by biology; the weather is what stretches it. Mating flights need afternoons above about 68°F with little wind, so a virgin who emerges into a cold, rainy week may take an extra 7 to 10 days to start laying. If she has not mated within about three weeks of emerging she is likely to become a drone layer. The calculator's "check" dates assume decent weather; add a week if it has been poor.
The oxalic acid opportunity most people miss. A package, a hived swarm and a colony raising a new queen all pass through a broodless stretch, when every mite in the hive is riding on an adult bee. One oxalic acid vaporization in that stretch reaches about 97% of them and gives the colony the cleanest start it will ever have. The timeline marks the window. Details: treating package bees and treating a swarm.
When to worry, and what to do
- No eggs 3 weeks after a queen should have emerged. Give it one more week if the weather was bad, then add a frame with eggs and young larvae from another colony. If they build queen cells on it, you were queenless; if they don't, there is a queen, she just hasn't started.
- Multiple eggs per cell, eggs on cell walls, bullet-shaped cappings in worker comb. Laying workers or a drone-laying queen. Laying-worker colonies rarely accept a new queen; combine them with a queenright colony instead.
- Queen cage still sealed a week after installation. Release her directly if the bees on the cage are feeding her calmly rather than biting the screen.
- A colony that stays queenless in fall. Combine it. There is no time to raise and mate a queen, and a queenless colony will not make it through winter.
Frequently asked questions
How long does it take a queen bee to develop?
About 16 days from egg to emergence: 3 days as an egg, roughly 5½ as a larva, capped on day 8 or 9, and out of the cell on day 16. She flies to mate about 5 to 7 days after emerging, weather permitting, and usually begins laying 2 to 3 weeks after emergence.
When should I check for eggs after installing a queen?
About a week after the bees release her from the cage, so 7 to 10 days after installation. Opening the hive earlier risks the colony balling a queen it has not fully accepted. If there are no eggs by day 14, something is wrong.
I saw capped queen cells. When will the new queen emerge?
A queen cell is capped on day 8 or 9 and the queen emerges on day 16, so a capped cell has at most 7 or 8 days to go. Unless you know when it was capped, assume emergence any time in the next week and do not disturb the colony for the following two.
When is a colony broodless after a package or swarm?
A package is broodless until the queen's first eggs are capped, roughly 12 to 14 days after installation. A prime swarm with a laying queen is broodless for about 9 days after it is hived. Both are the best oxalic acid opportunity a colony will ever give you: one vaporization reaches every mite.
How long can a colony be queenless before laying workers start?
Laying workers usually appear about three weeks after the last open brood is gone. A colony that lost its queen and raised a replacement can be six weeks from a laying queen, which is why the calculator tells you the date to add a frame of eggs and the date to stop waiting.
More free beekeeping tools
See all Lorob Bees beekeeping tools →
Related reading
- Queenless hive: signs and what to do
- Treating package bees with oxalic acid
- Treating a swarm with oxalic acid
- The varroa mite life cycle
- When is my hive broodless?
A new colony deserves a clean start
One 2 g vaporization with an InstantVap during the broodless days after a package, swarm or requeening resets the mite count before the first brood is capped. See the InstantVap Sizer to pick a model.
General beekeeping information from Lorob Bees, not a substitute for a product label or your state apiary inspector. Always read and follow the label of any product you use in a hive.