Isa Brown chickens typically start laying eggs at around 20 to 22 weeks of age, making them one of the earliest maturing breeds.
ISA Brown chickens are famous for their early and prolific egg production. These hybrid layers typically start laying between 16-22 weeks of age, making them one of the fastest-maturing egg producers available. Their reliable laying habits and friendly temperament make them ideal for backyard flocks.
ISA Brown Egg Laying Timeline
While most chickens take 5-6 months to begin laying, ISA Browns often beat this timeline. Here’s what to expect:
| Age | Development Stage |
|---|---|
| 12-14 weeks | Combs and wattles begin reddening |
| 15-18 weeks | First squatting behavior appears |
| 16-20 weeks | First small “practice” eggs may appear |
| 20-22 weeks | Full-sized egg production begins |
Early Signs Your ISA Browns Will Start Laying Soon
Watch for these physical and behavioral changes that indicate egg production is imminent:
- Squatting posture when approached (submissive breeding position)
- Reddened, enlarged comb and wattles
- Increased vocalization and nesting box investigation
- More frequent visits to the nesting area
- Appetite increase and more frequent drinking
As noted in our article on Rhode Island Red laying ages, hybrid breeds like ISA Browns typically mature faster than heritage breeds.
Maximizing ISA Brown Egg Production
To get the most from your ISA Browns during their peak laying years (typically 2-3 years), follow these tips:
1. Optimize Nutrition
Switch to a layer feed with 16-18% protein when they begin squatting. According to Purina Mills, this transition should happen about 2 weeks before expected first lay.
2. Create Ideal Nesting Conditions
Provide one nesting box per 3-4 hens, filled with soft bedding. Our guide on training chickens to use nesting boxes can help establish good habits early.
3. Maintain Consistent Lighting
14-16 hours of light daily stimulates egg production. Use timers to supplement natural light in winter months.
Common Early Laying Questions
Why Are My ISA Brown’s First Eggs So Small?
Pullet eggs (sometimes called “fairy eggs”) are normal for the first 1-2 weeks of laying. The eggs will increase to standard large size as the hen’s reproductive system matures.
Should I Worry If One Hen Starts Later Than Others?
No. While most ISA Browns start by 22 weeks, some may take until 24-25 weeks. This variation is normal, especially if you have hens from different hatches.
How Many Eggs Can I Expect?
ISA Browns are prolific layers, typically producing:
- 5-6 eggs per week during peak production
- 300+ eggs in their first year
- Continued laying through winter (though possibly reduced)
Extending Your ISA Brown’s Productive Years
While their intensive laying does shorten lifespan compared to heritage breeds, you can support your hens’ longevity by:
- Providing oyster shell free-choice for calcium
- Ensuring 1-2 months of rest each winter by reducing artificial light
- Supplementing with protein-rich treats like mealworms
- Monitoring for signs of reproductive stress like prolapse
Remember that even after their peak production years, ISA Browns make wonderful pets and will often continue laying occasional eggs for several more years.