Ultrasound 1 (18 days)
Ultrasound 2 (45 days)
Rectal (3 months)
Pregnant Mare Rhino Vaccination (5th month)
Pregnant Mare Rhino Vaccination (7th month)
Pregnant Mare Rhino Vaccination (9th month)
All vaccines at 10 months
The mare should be dewormed with Ivermectin on the day of foaling
Due Date (340 days)

You should average plus or minus 10 days for actual foaling window.
Miniatures foal around +/- 330 Days.