Move selected young larvae into queen cups and place them into a strong cell builder.
Grafting Timeline Calculator
Plan queen grafting batches with dates for cell capping, safe transfer to mating nucs, emergence, caging, mating flights, egg checks and final assessment.
Graft details
Larval age at grafting
Typical grafting assumes very young larvae, roughly 12-24 hours after hatch.
Best results usually come from small, freshly hatched larvae. Keep cells warm and avoid rough handling when transferring capped cells.
Assumptions and notes
- This schedule starts from the graft date and assumes larvae are already hatched.
- Very young larvae, around 12-24 hours old, are preferred for queen quality.
- Cells are commonly capped around 3-4 days after grafting.
- Safe transfer is normally after capping and before emergence, with extra care close to emergence.
- Mating checks should wait until the queen has had time to emerge, mature, mate and begin laying.
Queen grafting schedule
Accepted queen cells are sealed as larvae finish feeding and begin pupation.
Move capped cells to mating nucs before they emerge, while handling them gently.
Virgin queens emerge from the cells in their mating nucs.
Good weather and mature drones are needed for successful mating.
Check for eggs after the mating window, then make a final decision after the buffer date.
Grafting success tips
Choose tiny larvae
Young larvae floating in royal jelly usually produce the best queens.
Prepare the cell builder
Strong nurse bee density, feed and timing matter as much as the graft itself.
Keep cells warm
During transfers, protect cells from chilling, rolling and direct sun.
Record each batch
Track date, breeder colony, acceptance rate, emergence and mating success.
Common grafting mistakes
Using larvae too old
Older larvae may still be accepted, but they can produce poorer queens.
Weak cell builders
A weak builder cannot feed queen cells heavily enough for strong development.
Moving cells too roughly
Cells near emergence are fragile. Avoid shaking, rolling or leaving them cold.
Checking nucs too early
Early inspections can disturb virgins during orientation and mating.
Frequently asked questions
How old should larvae be for grafting?
Very young larvae are best, ideally around 12-24 hours after hatching. They should be tiny and sitting in royal jelly.
When do queen cells get capped after grafting?
Accepted queen cells are usually capped around three to four days after grafting, depending on larval age and colony conditions.
When should I move cells to mating nucs?
Move capped cells after they are sealed and before emergence. Many beekeepers transfer them a few days before the expected emergence date.
What is a good graft acceptance rate?
Experienced grafters often get high acceptance, but beginners may start much lower. Cell builder strength, larval age and technique all matter.
When should I check mating nucs for eggs?
Wait until after the mating window. A check around 10-14 days after emergence is usually more useful than an early disturbance.