Most chicks should move from starter feed to grower feed at around 6 weeks of age. This isn’t a hard deadline, but it’s the point where their nutritional needs shift enough that staying on starter feed starts working against you. From there, the timeline depends on whether you’re raising egg layers or meat birds, and a few visual and behavioral cues can help you nail the timing.
The Basic Feed Timeline
Chickens go through three main feed phases, each with a different protein level designed to match what their bodies need at that stage.
- Starter feed (hatch to 6 weeks): 20 to 24 percent protein. This dense formula fuels the explosive growth chicks go through in their first weeks of life, when they can double or triple in size.
- Grower feed (6 to 16 weeks): 16 to 18 percent protein. The step down in protein supports steady growth without pushing weight gain too fast, which can stress developing joints and organs.
- Layer feed (16 to 20 weeks): 15 to 18 percent protein, plus added calcium for eggshell production. You switch to this when your hens approach laying age.
Some feed brands sell a combined “starter/grower” formula that covers hatch through about 16 weeks in a single bag. If that’s what you’re using, you can skip the 6-week transition entirely and just switch to layer feed when the time comes.
Why the 6-Week Mark Matters
Starter feed is intentionally protein-heavy because chicks are growing at a rate they’ll never match again. But after about 6 weeks, that high protein level stops being helpful. Too much protein for too long can lead to excessive weight gain, which causes problems down the line, especially for laying breeds. The grower formula gives them enough fuel to keep developing muscle and bone without overdoing it.
By 6 weeks, most chicks have replaced nearly all their down with real feathers. That’s a useful visual marker. If your chicks still have significant patches of fluffy down, they may benefit from another week on starter before you make the switch.
Breed-Specific Differences
The 6-week guideline works well for most backyard flocks, but the exact timing shifts depending on what kind of chicken you’re raising.
Leghorn-type birds bred for egg production follow the standard schedule: starter from hatch to 6 weeks, grower from 6 to 14 weeks, then a developer or pre-layer feed until they start laying around 20 weeks. Dual-purpose breeds like Plymouth Rocks and Rhode Island Reds, which are larger birds, can move to grower feed slightly earlier, around 4 weeks, and stay on it through about 12 weeks before transitioning to a developer diet. These breeds grow bigger frames and consume more feed overall, so the earlier shift helps moderate their growth rate.
Meat birds (broilers) are on a completely different track. They move from starter to a finisher feed around 5 weeks and are typically processed between 6 and 8 weeks of age. Finisher feed is high in both protein and energy to maximize weight gain in those final days. If you’re raising broilers, the standard layer timeline doesn’t apply to you at all.
When to Switch to Layer Feed
The move to layer feed is the most important transition because the timing actually affects your birds’ health. Layer feed contains significantly more calcium than starter or grower formulas, typically around 3.5 to 4 percent. That calcium is essential for hens producing eggshells, but it’s hard on the kidneys of younger birds that aren’t laying yet. Feeding layer feed too early can cause real damage.
The trigger for switching to layer feed is either reaching 18 weeks of age or spotting the first egg, whichever comes first. Some breeds start laying a little earlier, some a little later, but 18 weeks is the benchmark for most common backyard breeds. A good rule of thumb: make your layer feed decision by week 16 so you have the bag ready and can begin a gradual transition at week 18.
If you have a mixed-age flock and some birds are laying while others aren’t yet, keep everyone on grower feed and offer oyster shell in a separate dish. The laying hens will eat the extra calcium they need, and the younger birds will leave it alone.
How to Transition Between Feeds
Chickens have sensitive digestive systems, and an abrupt feed change can cause loose droppings or temporary drops in eating. A gradual transition over about three weeks works best.
In the first week, mix roughly 75 percent of the old feed with 25 percent of the new feed. During the second week, move to a 50/50 blend. In the third week, shift to 75 percent new feed and 25 percent old. After that, you can serve the new feed exclusively. This schedule works for both the starter-to-grower switch and the grower-to-layer switch.
If you’re using a combined starter/grower feed, you only need to do this once, when you move to layer feed. That simplicity is one reason starter/grower blends are popular with backyard flock owners who don’t want to manage multiple transitions.
Signs You’ve Waited Too Long
Keeping chicks on starter feed well past 6 weeks won’t cause an immediate crisis, but you may notice your birds getting heavier than they should. Overweight pullets can have trouble laying later on. You might also see increased pecking or feather pulling, which sometimes happens when protein levels are higher than the birds need, leading to restless energy.
On the flip side, switching to layer feed before 16 weeks is the more dangerous mistake. The excess calcium forces immature kidneys to work harder than they’re designed to, and over time this can shorten a bird’s productive life. If you’re unsure of your birds’ exact age (common with rescue chickens or swap-meet purchases), err on the side of staying with grower feed longer rather than jumping to layer feed early.