04/24/2026
In Oklahoma and Texas, our warmer climate gives mares a slightly longer natural breeding window compared to northern regions.
✔️ Typical Breeding Season: March – August (sometimes into early fall)
✔️ Peak Fertility: April – June
✔️ Cycle Length: ~21 days
✔️ Heat (Estrus): 5–7 days
🌱 Because spring arrives earlier in the south, mares often begin cycling sooner—making March breeding more successful than in colder climates.
🐎 Breeding in early spring means foals arrive February–April the following year, which is ideal for growth, pasture access, and performance timelines.
💡 Pro Tip: Many breeders use artificial lighting starting in December/January to bring mares into cycle even earlier for January/February foals.
Planning a breeding? We can help with exams, timing, and reproductive management!
📞 Durant Animal Hospital
Call us at 580-924-1640