Know · Breeding & ranch planning
Cattle Gestation Chart: Breeding to Calving Timeline
Breed-aware gestation chart and calving windows that hand off to the live cattle gestation calculator.
How long is cow gestation?
Cow gestation is typically about 283 days (roughly 9 months). Most cattle calve somewhere in the 279–292 day range depending on breed, with individuals still varying around that average. Use the breed table below, then open the live calculator with your service date for a due date and ±7 day window.
How to use this gestation chart
A cattle gestation chart estimates calving from a breeding or AI date using breed-typical day counts. Real calving still varies by individual, fetal sex, nutrition, and season — use a ±7 day window for labor planning, not a guarantee of the exact hour.
Pick your breed row below, then open the live calculator with your actual service date for milestones and a printable timeline.
Gestation length by breed
| Breed / type | Typical days | ±7d window note | Calculator |
|---|---|---|---|
| Standard Beef Average | 283 | Due ±7 days (~276–290 from service) | Prefill → |
| Angus (Black / Red) | 281 | Due ±7 days (~274–288 from service) | Prefill → |
| Hereford / Polled Hereford | 285 | Due ±7 days (~278–292 from service) | Prefill → |
| Charolais | 289 | Due ±7 days (~282–296 from service) | Prefill → |
| Simmental | 286 | Due ±7 days (~279–293 from service) | Prefill → |
| Brahman / Zebu Influence | 292 | Due ±7 days (~285–299 from service) | Prefill → |
| Gelbvieh | 283 | Due ±7 days (~276–290 from service) | Prefill → |
| LimousinFrom link | 289 | Due ±7 days (~282–296 from service) | Prefill → |
| Dairy (Holstein / Jersey) | 279 | Due ±7 days (~272–286 from service) | Prefill → |
Educational averages for planning. Association or herd data may differ — adjust with the custom-days option in the calculator when needed.
Pregnancy milestones
From breeding / AI date
- Day 18–24: Return-to-heat watch — Watch for repeat estrus if open.
- Day 30–45: Early pregnancy ultrasound window — Common early diagnosis window with a veterinarian.
- Day 60–90: Palpation / mid pregnancy check — Confirm pregnancy and stage with herd vet protocols.
Before expected calving
- Pre-calving vaccine window: Coordinate scour / respiratory vaccines with your veterinarian.
- Close-up / maternity pen: Move pairs to a clean, monitored calving area.
- Expected calving window: Practical ±7 days around the estimated due date.
Open the gestation calculator
Enter breeding date and breed to get estimated calving, the ±7 day window, heat return, pregnancy-check ranges, and pre-calving vaccine timing.
Open cattle gestation calculatorWorking backward from a target calving date? Use the calving date calculator.
Calving-week weather readiness
Gestation math fails if the calving pasture is a mud trap or a cold snap hits without feed and shelter. In the week before the due window, check cold stress, heat/THI, water, and daily ranch actions.
Coming from AI breeding? Start at the artificial insemination hub.