Flock Rotation Planner: the complete guide
A flock all bought in one spring lays beautifully for two years and then falls off a cliff together. Rotation fixes that. Enter your current age groups and a weekly egg target, and this planner charts production for the next three years and tells you when to order the next batch of chicks.
How the flock rotation planner works
- Each age group is run through the standard laying curve: nothing until about 20 weeks, full production from 6 to 18 months, a molt pause near 18 months, then roughly 80 percent, 62 percent and 45 percent in the years after.
- Molt is modelled as a sharp two month drop at about 18 and 30 months, which is where most keepers get surprised.
- When projected production falls below your target, the planner schedules a pullet batch sized to the shortfall, allowing five months from day old chick to first egg.
- It will not stack orders. Once a batch is scheduled it waits for those birds to come into lay before scheduling another.
- Hens are flagged as uneconomic at about 42 months, where feed cost typically overtakes the value of the eggs.
How to use it
- Add one row per age group: how many birds and how old they are in months.
- Set the eggs per week you want the flock to hold above.
- Pick the type of layer you keep, which sets the peak rate the curve is built on.
- Read the chart for the dips, then work down the add schedule and put those order dates in your calendar.
Step by step examples
Six hens, all 14 months old
Production looks fine now at about 28 eggs a week, then collapses near month four when they all molt together. The planner schedules four pullets straight away so the replacements are laying before the molt bites.
Staggered flock
Four hens at 30 months and four at 8 months hold a steadier line. The planner adds three birds a year rather than one large batch, which is the pattern that keeps a small flock level.
Recommended values
| Item | Value | Notes |
|---|---|---|
| First egg | 20 to 24 weeks | Heavy breeds later |
| Peak laying | 6 to 18 months | |
| First molt | About 18 months | |
| Year two output | About 80% of peak | |
| Year three output | About 60% of peak | |
| Chick to first egg | 5 months | Order that far ahead |
Common mistakes
- Buying the whole flock at once, so every bird molts and ages out in the same season.
- Ordering chicks in autumn. They come into lay in the short days of winter and stall.
- Forgetting the molt. A perfectly healthy flock can stop almost completely for six to eight weeks.
- Adding birds without checking coop and run space first.
Frequently asked questions
How often should I add new chickens?
For a small backyard flock, a small batch every 12 to 18 months keeps production level without the flock ever growing too large.
When do hens stop being worth keeping?
Purely on cost, around three and a half years, when feed usually outruns egg value. Plenty of keepers carry hens well past that as pets, which is a fine choice as long as it is a deliberate one.
What time of year should I order chicks?
February to April is ideal in the northern hemisphere. They reach lay in late summer and give you a full first autumn and winter.
Will older hens teach the new ones?
Yes, mixed age flocks settle faster and find the nest boxes sooner, which is another argument for rotating rather than replacing.
Related calculators
What next?
Free tools that pair well with this calculator.