Why was my hatch rate so low?

Start by separating two causes. If the eggs were never fertile, it's a **breeding-pen problem** — too few or infertile males, old or undernourished birds, off-season fertility, or eggs stored too long before setting. If the eggs were fertile but the embryos died, it's an **incubation problem** — usually temperature, humidity, turning, or an uncalibrated gauge. **Candle at day 7–10 and break out the unhatched eggs** to see which bucket dominates: lots of clears means fertility, lots of dead embryos means incubation. Also check your benchmark: well-run local eggs hatch about **75–90% of the fertile eggs**, but shipped eggs commonly hatch only **~50%**, so your rate may actually be normal.

How do I know if the problem was fertility or incubation?

Do a **breakout analysis**. Open the eggs that didn't hatch: a clean yolk with no embryo means infertile (fertility problem); a blood ring or a tiny stalled embryo means early death; a large, fully-formed chick means late death (both are incubation problems). The mix tells you whether to fix the breeding pen or the incubator.

What is a normal or good hatch rate?

For well-managed local eggs set fresh, **75–90%+ of the fertile eggs** is a strong hatch. Remember that's hatch *of fertile* — if many eggs were infertile, your overall hatch will be lower even with perfect incubation.

Why did my shipped eggs hatch so poorly?

Shipped eggs take a beating in transit — vibration and pressure swings detach and scramble the air cells. Around **50% (roughly 25–50%)** is widely considered a normal, acceptable hatch for shipped eggs. Rest them large-end up for 8–24 hours before setting and consider incubating upright, but don't expect local-egg numbers.

My eggs were fertile but the chicks died near hatch. What went wrong?

Fully-formed chicks that die late — or pip but never zip — usually point to humidity that was wrong at the end or the incubator being opened during lockdown. Mississippi State Extension recommends about **58–60% humidity** through incubation, raised to **at least 65%** for the final hatching days, and keeping the lid shut once chicks start pipping.

Why Were My Hatch Rates Low?

Verified September 2026

The short version

First, figure out which problem you have: were the eggs never fertile (a breeding-pen issue — ratio, age, nutrition, season) or did fertile eggs die during incubation (a temperature, humidity, turning, or calibration issue)? A breakout of the unhatched eggs tells you which. Well-managed local eggs commonly hatch 75–90%+ of the fertile eggs, while shipped eggs often hatch only ~50% because of transit damage — so a 'low' number is sometimes completely normal.

Fertility vs. hatchability — the distinction that solves it

A low hatch has two very different root causes, and they get fixed in two different places. Fertility is the share of eggs that were fertile to begin with; hatchability is the share of *fertile* eggs that actually hatch. If your eggs were never fertile, no incubator on earth would have hatched them — the fix is in the breeding pen. If the eggs were fertile but the embryos died, the fix is in your incubation.

Clear eggs (no development at all) point to fertility. University extension troubleshooting guides tie clear eggs to too few or infertile males, males that are too old or undernourished, seasonal fertility dips, diseased flocks, or eggs stored too long or incorrectly before setting. Mississippi State Extension recommends storing hatching eggs at 50–60°F and about 60% humidity and setting them within 7 days of lay — stale storage reads as 'infertility' on the candler even when the pen is fine.

Embryos that started and then quit point to incubation. Early death clusters around incubation temperature that ran too high, too little turning, or poor ventilation; late death and fully-formed chicks that pipped but never zipped usually trace to humidity that was wrong for the last stretch. Sorting your unhatched eggs into these buckets is the whole game.

How to tell which: candle, then break out the duds

You can diagnose most of this without guessing. Candle at day 7–10: a fertile, developing egg shows a spider-web of veins and a moving embryo, while a clear egg with just a floating yolk shadow was almost certainly infertile. A high count of clears means a fertility problem.

For anything that didn't hatch, do a breakout analysis — open the eggs (over a bag, outdoors) and read them. Extension programs use exactly this method: no visible embryo and a clean yolk means infertile; a blood ring or a tiny embryo with a stalled ring of vessels means early death; a large, fully-feathered chick means late death. UF/IFAS publishes a systematic breakout-to-cause key for this. The ratio of infertile to early-death to late-death eggs tells you whether to change your rooster-to-hen setup or your incubator settings.

Health-related die-offs (bacterial contamination, disease in the breeding flock) are a separate lane. This guide does not give medical or dosing advice — if you suspect flock disease or persistent contamination, work with a vet or the diagnostic tools at PoultryDVM.

What hatch rate is actually normal?

Before you tear the incubator apart, sanity-check the number against realistic benchmarks. For well-managed local eggs set fresh, hatching 75–90%+ of the fertile eggs is a strong result; commercial operations run in the upper end of that band. Note that this is 'hatch of fertile' — if half your eggs were infertile, even a flawless incubation caps your overall hatch near 50%.

Shipped eggs are a different animal. Vibration and pressure changes in transit scramble and detach air cells, and many sellers and hatchers consider around 50% (roughly 25–50%) a normal, acceptable hatch for shipped eggs even when everything is done right. Six chicks from a dozen shipped eggs is a good day. If you're judging a shipped-egg hatch by local-egg standards, your rate may not be 'low' at all — it may be exactly what shipped eggs do.

Fixing an incubation problem: calibrate, temp, humidity, turning

If the breakout says fertile-but-died, work the four incubation levers in order. Calibration first: built-in incubator gauges are frequently off — verify temperature and humidity against a known-good thermometer and hygrometer before changing anything, because you may be chasing a reading, not a reality.

Temperature: Mississippi State Extension advises keeping a forced-air incubator at about 100°F (many sources cite 99.5–100°F) and holding fluctuations under roughly half a degree. Consistently high temperature causes early death and early hatch; consistently low temperature causes a late, weak hatch. Humidity: run about 58–60% RH through incubation and raise it to at least 65% for the final hatching days per MSU — too dry sticks and shrink-wraps chicks, too wet drowns them. Track the air cell as your real gauge; it should reach roughly a third of the egg by lockdown.

Turning: turn at least 3–5 times a day (an odd number) until lockdown, then stop. And don't open the incubator during lockdown — the humidity crash can shrink-wrap a pipping chick and turn a good hatch into a bad one at the finish line.

Common pitfalls

Blaming the incubator when the eggs were never fertile — always separate a fertility problem from a hatchability problem with a breakout before changing settings.
Judging shipped eggs by local-egg benchmarks; ~50% is often a normal shipped-egg hatch, not a failure.
Trusting the incubator's built-in thermometer and hygrometer instead of calibrating against a known-good instrument.
Setting stale or badly stored eggs (over 7 days old, wrong temperature) and reading the resulting clears as 'infertility.'
Not doing a breakout analysis at all — throwing out the unhatched eggs discards the exact evidence that tells you what went wrong.

Frequently asked questions

Why was my hatch rate so low?: Start by separating two causes. If the eggs were never fertile, it's a breeding-pen problem — too few or infertile males, old or undernourished birds, off-season fertility, or eggs stored too long before setting. If the eggs were fertile but the embryos died, it's an incubation problem — usually temperature, humidity, turning, or an uncalibrated gauge. Candle at day 7–10 and break out the unhatched eggs to see which bucket dominates: lots of clears means fertility, lots of dead embryos means incubation. Also check your benchmark: well-run local eggs hatch about 75–90% of the fertile eggs, but shipped eggs commonly hatch only ~50%, so your rate may actually be normal.
How do I know if the problem was fertility or incubation?: Do a breakout analysis. Open the eggs that didn't hatch: a clean yolk with no embryo means infertile (fertility problem); a blood ring or a tiny stalled embryo means early death; a large, fully-formed chick means late death (both are incubation problems). The mix tells you whether to fix the breeding pen or the incubator.
What is a normal or good hatch rate?: For well-managed local eggs set fresh, 75–90%+ of the fertile eggs is a strong hatch. Remember that's hatch *of fertile* — if many eggs were infertile, your overall hatch will be lower even with perfect incubation.
Why did my shipped eggs hatch so poorly?: Shipped eggs take a beating in transit — vibration and pressure swings detach and scramble the air cells. Around 50% (roughly 25–50%) is widely considered a normal, acceptable hatch for shipped eggs. Rest them large-end up for 8–24 hours before setting and consider incubating upright, but don't expect local-egg numbers.
Could my thermometer be the reason for a low hatch?: Very possibly. Built-in incubator gauges are often inaccurate, so an incubator that reads correct can be running hot or cold. Calibrate against a known-good thermometer and hygrometer before adjusting anything — consistently high temperature causes early death, consistently low temperature causes a late, weak hatch.
My eggs were fertile but the chicks died near hatch. What went wrong?: Fully-formed chicks that die late — or pip but never zip — usually point to humidity that was wrong at the end or the incubator being opened during lockdown. Mississippi State Extension recommends about 58–60% humidity through incubation, raised to at least 65% for the final hatching days, and keeping the lid shut once chicks start pipping.

Sources

Trouble Shooting Failures with Egg Incubation — Mississippi State University Extension Service (University extension)
Important incubation factors — Mississippi State University Extension Service (University extension)
A Systematic Approach to Solving Hatchability and Chick Quality Problems (VM101) — University of Florida IFAS Extension (EDIS) (University extension)